Virginia Wildflowers plant names both scientific and common.
Did you know that the State of Virginia has over 15,187 Scientific names for all the wildflowers that are found across the state? That’s a lot of different types of wildflowers and seeds.
Landscape Pros in Gainesville, VA has over 30 years experience in providing landscape design and landscaping services in Northern Virginia and Prince William county. We’ve planted a lot of flowers over the years however, we believe that our experienced gardeners may still have a little way to go if we want to be able to say, we have planted every one of Virginia’s wildflowers. But, if you have a few favorite wildflowers of your own… we can probably say that “We have planted that wildflower before”.
Below are the common names and scientific names of Virginia’s unique wildflowers according to the experts on flowers. Which ones are your favorites?
| Scientific Name | Common Name |
| Thermopsis villosa (Walter) Fernald & B.G. Schub. | Aaron’s rod |
| Vachellia Wight & Arn. | acacia |
| Isoetes acadiensis Kott | Acadian quillwort |
| Acinos Mill. | acinos |
| Aplectrum Torr. | Adam and Eve |
| Yucca filamentosa L. | Adam’s needle |
| Malaxis Sol. ex Sw. | adder’s-mouth orchid |
| Ophioglossum L. | adderstongue |
| Clematis addisonii Britton | Addison’s leather flower |
| Dichanthelium ovale (Elliott) Gould & C.A. Clark var. addisonii (Nash) Gould & C.A. Clark | Addison’s rosette grass |
| Adlumia Raf. ex DC. | adlumia |
| Agrimonia L. | agrimony |
| Gentianella quinquefolia (L.) Small | agueweed |
| Ailanthus Desf. | ailanthus |
| Tillandsia L. | airplant |
| Cheilanthes alabamensis (Buckley) Kunze | Alabama lipfern |
| Sarracenia rubra (Case & R.B. Case) S. McPherson & D.E. Schnell ssp. alabamensis | Alabama pitcherplant |
| Amelanchier arborea (Michx. f.) Fernald var. alabamensis (Britton) G.N. Jones | Alabama serviceberry |
| Berchemia scandens (Hill) K. Koch | Alabama supplejack |
| Albizia Durazz. | albizia |
| Alnus Mill. | alder |
| Rhamnus alnifolia L’Hér. | alderleaf buckthorn |
| Medicago L. | alfalfa |
| Puccinellia Parl. | alkaligrass |
| Rubus allegheniensis Porter | Allegheny blackberry |
| Boykinia aconitifolia Nutt. | Allegheny brookfoam |
| Hieracium paniculatum L. | Allegheny hawkweed |
| Mimulus ringens L. | Allegheny monkeyflower |
| Ranunculus allegheniensis Britton | Allegheny Mountain buttercup |
| Thermopsis mollis (Michx.) M.A. Curtis ex A. Gray | Allegheny Mountain goldenbanner |
| Allium allegheniense Small | Allegheny onion |
| Prunus alleghaniensis Porter | Allegheny plum |
| Amelanchier laevis Wiegand | Allegheny serviceberry |
| Hylotelephium telephioides (Michx.) H. Ohba | Allegheny stonecrop |
| Adlumia fungosa (Aiton) Greene ex Britton, Sterns & Poggenb. | allegheny vine |
| Alliaria Heist. ex Fabr. | alliaria |
| Alternanthera philoxeroides (Mart.) Griseb. | alligatorweed |
| Centaurea transalpina Schleich. ex DC. | alpine knapweed |
| Arabis alpina L. | alpine rockcress |
| Viola labradorica Schrank | alpine violet |
| Trifolium hybridum L. | alsike clover |
| Cornus alternifolia L. f. | alternateleaf dogwood |
| Heuchera L. | alumroot |
| Leptochloa panicoides (J. Presl) Hitchc. | Amazon sprangletop |
| Strophostyles helvola (L.) Elliott | amberique-bean |
| Heuchera americana L. | American alumroot |
| Berberis canadensis Mill. | American barberry |
| Tilia americana L. | American basswood |
| Ammophila breviligulata Fernald | American beachgrass |
| Diarrhena americana P. Beauv. | American beakgrain |
| Callicarpa americana L. | American beautyberry |
| Fagus grandifolia Ehrh. | American beech |
| Campanulastrum americanum (L.) Small | American bellflower |
| Lotus unifoliolatus (Hook.) Benth. | American bird’s-foot trefoil |
| Cardamine rotundifolia Michx. | American bittercress |
| Celastrus scandens L. | American bittersweet |
| Ribes americanum Mill. | American black currant |
| Sambucus nigra L. ssp. canadensis (L.) R. Bolli | American black elderberry |
| Staphylea trifolia L. | American bladdernut |
| Buchnera americana L. | American bluehearts |
| Brunnichia ovata (Walter) Shinners | American buckwheat vine |
| Erechtites hieraciifolius (L.) Raf. ex DC. | American burnweed |
| Sparganium americanum Nutt. | American bur-reed |
| Conopholis americana (L.) Wallr. | American cancer-root |
| Castanea dentata (Marshall) Borkh. | American chestnut |
| Lygodium palmatum (Bernh.) Sw. | American climbing fern |
| Frasera caroliniensis Walter | American columbo |
| Phragmites australis (Cav.) Trin. ex Steud. ssp. americanus Saltonst., P.M. Peterson & Soreng | American common reed |
| Sacciolepis striata (L.) Nash | American cupscale |
| Vallisneria americana Michx. | American eelgrass |
| Ulmus americana L. | American elm |
| Hedeoma pulegioides (L.) Pers. | American false pennyroyal |
| Hottonia inflata Elliott | American featherfoil |
| Lonicera canadensis W. Bartram ex Marshall | American fly honeysuckle |
| Panax quinquefolius L. | American ginseng |
| Chrysosplenium americanum Schwein. ex Hook. | American golden saxifrage |
| Lipocarpha maculata (Michx.) Torr. | American halfchaff sedge |
| Corylus americana Walter | American hazelnut |
| Amphicarpaea bracteata (L.) Fernald | American hogpeanut |
| Ilex opaca Aiton | American holly |
| Carpinus caroliniana Walter | American hornbeam |
| Euphorbia ipecacuanhae L. | American ipecac |
| Glycyrrhiza lepidota Pursh | American licorice |
| Convallaria majuscula Greene | American lily-of-the-valley |
| Phryma leptostachya L. | American lopseed |
| Nelumbo lutea Willd. | American lotus |
| Glyceria grandis S. Watson | American mannagrass |
| Hydrocotyle americana L. | American marshpennywort |
| Milium effusum L. | American milletgrass |
| Sorbus americana Marshall | American mountain ash |
| Prunus americana Marshall | American plum |
| Phytolacca americana L. | American pokeweed |
| Rubus idaeus L. | American red raspberry |
| Cakile edentula (Bigelow) Hook. | American searocket |
| Senna hebecarpa (Fernald) Irwin & Barneby | American senna |
| Styrax americanus Lam. | American snowbell |
| Veronica americana Schwein. ex Benth. | American speedwell |
| Aralia racemosa L. | American spikenard |
| Limnobium spongia (Bosc) Rich. ex Steud. | American spongeplant |
| Lithospermum latifolium Michx. | American stoneseed |
| Platanus occidentalis L. | American sycamore |
| Diphylleia cymosa Michx. | American umbrellaleaf |
| Vicia americana Muhl. ex Willd. | American vetch |
| Lycopus americanus Muhl. ex W.P.C. Barton | American water horehound |
| Alisma subcordatum Raf. | American water plantain |
| Justicia americana (L.) Vahl | American water-willow |
| Elatine americana (Pursh) Arn. | American waterwort |
| Nymphaea odorata Aiton | American white waterlily |
| Daucus pusillus Michx. | American wild carrot |
| Pyrola americana Sweet | American wintergreen |
| Wisteria frutescens (L.) Poir. | American wisteria |
| Hamamelis virginiana L. | American witchhazel |
| Carex lasiocarpa Ehrh. var. americana Fernald | American woollyfruit sedge |
| Isoetes riparia Engelm. ex A. Braun var. amesii (A.A. Eaton) Proctor | Ames’ quillwort |
| Amianthium A. Gray | amianthium |
| Lonicera maackii (Rupr.) Herder | Amur honeysuckle |
| Ampelopsis brevipedunculata (Maxim.) Trautv. | Amur peppervine |
| Ligustrum amurense Carrière | Amur privet |
| Anemone L. | anemone |
| Angelica L. | angelica |
| Rhynchospora caduca Elliott | anglestem beaksedge |
| Ludwigia leptocarpa (Nutt.) H. Hara | anglestem primrose-willow |
| Matelea gonocarpos (Walter) Shinners | angularfruit milkvine |
| Solidago odora Aiton | anisescented goldenrod |
| Sisyrinchium rosulatum E.P. Bicknell | annual blue-eyed grass |
| Poa annua L. | annual bluegrass |
| Phalaris canariensis L. | annual canarygrass |
| Vulpia myuros (L.) C.C. Gmel. | annual fescue |
| Fimbristylis annua (All.) Roem. & Schult. | annual fimbry |
| Stachys annua (L.) L. | annual hedgenettle |
| Lunaria annua L. | annual honesty |
| Iva annua L. | annual marsh elder |
| Phlox drummondii Hook. | annual phlox |
| Polypogon monspeliensis (L.) Desf. | annual rabbitsfoot grass |
| Ambrosia artemisiifolia L. | annual ragweed |
| Juncus abortivus Chapm. | annual rush |
| Suaeda linearis (Elliott) Moq. | annual seepweed |
| Aira elegans Willd. ex Kunth | annual silver hairgrass |
| Facelis retusa (Lam.) Sch. Bip. | annual trampweed |
| Anthoxanthum aristatum Boiss. | annual vernalgrass |
| Diplotaxis muralis (L.) DC. | annual wallrocket |
| Montia fontana L. | annual water minerslettuce |
| Zizania aquatica L. | annual wildrice |
| Melilotus indicus (L.) All. | annual yellow sweetclover |
| Anoda Cav. | anoda |
| Calystegia sepium (L.) R. Br. ssp. appalachiana Brummitt | Appalachia false bindweed |
| Waldsteinia fragarioides (Michx.) Tratt. | Appalachian barren strawberry |
| Trichomanes boschianum Sturm | Appalachian bristle fern |
| Actaea rubifolia (Kearney) Kartesz | Appalachian bugbane |
| Veratrum parviflorum Michx. | Appalachian bunchflower |
| Woodsia appalachiana T.M.C. Taylor | Appalachian cliff fern |
| Huperzia appalachiana Beitel & Mickel | Appalachian clubmoss |
| Astilbe biternata (Vent.) Britton | Appalachian false goat’s beard |
| Gentiana austromontana Pringle & Sharp | Appalachian gentian |
| Ribes rotundifolium Michx. | Appalachian gooseberry |
| Stachys appalachiana D.B. Poind. & J.B. Nelson | Appalachian hedgenettle |
| Pycnanthemum flexuosum (Walter) Britton, Sterns & Poggenb. | Appalachian mountainmint |
| Gymnocarpium appalachianum Pryer | Appalachian oakfern |
| Polypodium appalachianum Haufler & Windham | Appalachian polypody |
| Isoetes appalachiana D.F. Brunton & D.M. Britton | Appalachian quillwort |
| Carex appalachica J. Webber & P.W. Ball | Appalachian sedge |
| Vittaria appalachiana Farrar & Mickel | Appalachian shoestring fern |
| Minuartia glabra (Michx.) Mattf. | Appalachian stitchwort |
| Malus Mill. | apple |
| Mentha suaveolens Ehrh. | apple mint |
| Nicandra physalodes (L.) Scop. | apple of Peru |
| Thuja L. | arborvitae |
| Bromus kalmii A. Gray | arctic brome |
| Juncus arcticus Willd. | arctic rush |
| Glyceria arkansana Fernald | Arkansas mannagrass |
| Arnica L. | arnica |
| Symphyotrichum oblongifolium (Nutt.) G.L. Nesom | aromatic aster |
| Gomphrena serrata L. | arrasa con todo |
| Peltandra Raf. | arrow arum |
| Pseudosasa Makino ex Nakai | arrow bamboo |
| Aristida purpurascens Poir. | arrowfeather threeawn |
| Triglochin L. | arrowgrass |
| Sagittaria L. | arrowhead |
| Crotalaria sagittalis L. | arrowhead rattlebox |
| Trifolium vesiculosum Savi | arrowleaf clover |
| Polygonum sagittatum L. | arrowleaf tearthumb |
| Viola sagittata Aiton | arrowleaf violet |
| Arum L. | arum |
| Aruncus L. | aruncus |
| Clinopodium ascendens (Jord.) Samp. | ascending wild basil |
| Fraxinus L. | ash |
| Helianthus mollis Lam. | ashy sunflower |
| Digitaria bicornis (Lam.) Roem. & Schult. | Asian crabgrass |
| Cleome viscosa L. | Asian spiderflower |
| Commelina communis L. | Asiatic dayflower |
| Polygonum perfoliatum L. | Asiatic tearthumb |
| Asparagus L. | asparagus |
| Athyrium filix-femina (L.) Roth ssp. asplenioides (Michx.) Hultén | asplenium ladyfern |
| Aster L. | aster |
| Conyza bonariensis (L.) Cronquist | asthmaweed |
| Zephyranthes atamasca (L.) Herb. | Atamasco lily |
| Camassia scilloides (Raf.) Cory | Atlantic camas |
| Solidago arguta Aiton | Atlantic goldenrod |
| Glyceria obtusa (Muhl.) Trin. | Atlantic mannagrass |
| Clitoria mariana L. | Atlantic pigeonwings |
| Toxicodendron pubescens Mill. | Atlantic poison oak |
| Chamaecyparis thyoides (L.) Britton, Sterns & Poggenb. | Atlantic white cedar |
| Ellisia nyctelea (L.) L. | Aunt Lucy |
| Aurinia Desv. | aurinia |
| Marsilea mutica Mett. | Australian Water-Clover |
| Chloris ventricosa R. Br. | Australian windmill grass |
| Poa autumnalis Muhl. ex Elliott | autumn bluegrass |
| Corallorhiza odontorhiza (Willd.) Poir. | autumn coralroot |
| Solidago sphacelata Raf. | autumn goldenrod |
| Elaeagnus umbellata Thunb. | autumn olive |
| Geum L. | avens |
| Carex stipata Muhl. ex Willd. | awlfruit sedge |
| Sagittaria subulata (L.) Buchenau | awl-leaf arrowhead |
| Sagina subulata (Sw.) C. Presl | awl-leaf pearlwort |
| Pycnanthemum setosum Nutt. | awned mountainmint |
| Rhexia aristosa Britton | awnpetal meadowbeauty |
| Mecardonia acuminata (Walter) Small | axilflower |
| Tagetes erecta L. | Aztec marigold |
| Nicotiana rustica L. | Aztec tobacco |
| Houstonia caerulea L. | azure bluet |
| Nemophila Nutt. | baby blue eyes |
| Gypsophila L. | baby’s-breath |
| Baccharis L. | baccharis |
| Paspalum notatum Flueggé | bahiagrass |
| Rubus baileyanus Britton | Bailey’s dewberry |
| Carex baileyi Britton | Bailey’s sedge |
| Galium orizabense Hemsl. | bald bedstraw |
| Bromus racemosus L. | bald brome |
| Taxodium Rich. | bald cypress |
| Eleocharis erythropoda Steud. | bald spikerush |
| Cyperus croceus Vahl | Baldwin’s flatsedge |
| Paronychia baldwinii (Torr. & A. Gray) Fenzl ex Walp. | Baldwin’s nailwort |
| Eleocharis baldwinii (Torr.) Chapm. | Baldwin’s spikerush |
| Calepina Adans. | ballmustard |
| Cardiospermum halicacabum L. | balloon vine |
| Cardiospermum L. | balloonvine |
| Melissa L. | balm |
| Populus ×jackii Sarg. [balsamifera × deltoides] | balm-of-Gilead |
| Abies balsamea (L.) Mill. | balsam fir |
| Packera paupercula (Michx.) Á. Löve & D. Löve | balsam groundsel |
| Populus balsamifera L. | balsam poplar |
| Phyllostachys Siebold & Zucc. | bamboo |
| Smilax pseudochina L. | bamboo vine |
| Actaea L. | baneberry |
| Marshallia Schreb. | Barbara’s buttons |
| Scirpus ancistrochaetus Schuyler | barbedbristle bulrush |
| Berberis L. | barberry |
| Barbula Hedw. | barbula moss |
| Teesdalia nudicaulis (L.) W.T. Aiton | barestem teesdalia |
| Hordeum L. | barley |
| Echinochloa crus-galli (L.) P. Beauv. | barnyardgrass |
| Carex barrattii Schwein. & Torr. | Barratt’s sedge |
| Waldsteinia Willd. | barren strawberry |
| Symphyotrichum pratense (Raf.) G.L. Nesom | barrens silky aster |
| Quercus ×heterophylla Michx. f. (pro sp.) [phellos × rubra] | Bartram oak |
| Trichophorum planifolium (Spreng.) Palla | bashful bulrush |
| Ocimum L. | basil |
| Pycnanthemum clinopodioides Torr. & A. Gray | basil mountainmint |
| Acinos arvensis (Lam.) Dandy | basil thyme |
| Aurinia saxatilis (L.) Desv. | basket of gold |
| Salix viminalis L. | basket willow |
| Oplismenus P. Beauv. | basketgrass |
| Tilia L. | basswood |
| Comandra Nutt. | bastard toadflax |
| Persea Mill. | bay |
| Myosotis laxa Lehm. | bay forget-me-not |
| Malaxis bayardii Fernald | Bayard’s adder’s-mouth orchid |
| Morella Lour. | bayberry |
| Agalinis fasciculata (Elliott) Raf. | beach false foxglove |
| Lechea maritima Leggett ex Britton, Sterns & Poggenb. | beach pinweed |
| Prunus maritima Marshall | beach plum |
| Carex silicea Olney | beach sedge |
| Ammophila Host | beachgrass |
| Quercus ×beadlei Trel. ex Palmer [alba × michauxii] | Beadle oak |
| Pycnanthemum beadlei (Small) Fernald | Beadle’s mountainmint |
| Agrimonia rostellata Wallr. | beaked agrimony |
| Valerianella radiata (L.) Dufr. | beaked cornsalad |
| Cuscuta rostrata Shuttlw. ex Engelm. & A. Gray | beaked dodder |
| Corylus cornuta Marshall | beaked hazelnut |
| Panicum anceps Michx. | beaked panicgrass |
| Eleocharis rostellata (Torr.) Torr. | beaked spikerush |
| Diarrhena P. Beauv. | beakgrain |
| Rhynchospora Vahl | beaksedge |
| Mahonia bealei (Fortune) Carrière | Beale’s barberry |
| Phaseolus L. | bean |
| Quercus ilicifolia Wangenh. | bear oak |
| Usnea Dill. ex Adans. | beard lichen |
| Bidens aristosa (Michx.) Britton | bearded beggarticks |
| Cyperus squarrosus L. | bearded flatsedge |
| Brachyelytrum erectum (Schreb. ex Spreng.) P. Beauv. | bearded shorthusk |
| Gymnopogon ambiguus (Michx.) Britton, Sterns & Poggenb. | bearded skeletongrass |
| Leptochloa fusca (L.) Kunth ssp. fascicularis (Lam.) N. Snow | bearded sprangletop |
| Polypogon viridis (Gouan) Breistr. | beardless rabbitsfoot grass |
| Penstemon Schmidel | beardtongue |
| Xerophyllum Michx. | beargrass |
| Callicarpa L. | beautyberry |
| Cruciata Mill. | bedstraw |
| Monarda L. | beebalm |
| Fagus L. | beech |
| Epifagus Nutt. | beechdrops |
| Phegopteris Fée | beechfern |
| Perilla frutescens (L.) Britton | beefsteakplant |
| Beta L. | beet |
| Galax urceolata (Poir.) Brummitt | beetleweed |
| Hackelia virginiana (L.) I.M. Johnst. | beggarslice |
| Bidens L. | beggarticks |
| Belamcanda Adans. | belamcanda |
| Campanula L. | bellflower |
| Bellis L. | bellis |
| Uvularia L. | bellwort |
| Carex styloflexa Buckley | bent sedge |
| Agrostis L. | bentgrass |
| Corallorhiza bentleyi Freudenstein | Bentley’s coralroot |
| Cynodon Rich. | Bermudagrass |
| Viola ×bernardii Greene (pro sp.) [pedatifida × sororia] | Bernard violet |
| Erigeron strigosus Muhl. ex Willd. var. beyrichii (Fisch. & C.A. Mey.) Torr. & A. Gray ex A. Gray | Beyrich’s fleabane |
| Geranium bicknellii Britton | Bicknell’s cranesbill |
| Oenothera gaura W.L. Wagner & Hoch | biennial beeblossom |
| Liriope muscari (Decne.) L.H. Bailey | big blue lilyturf |
| Andropogon gerardii Vitman | big bluestem |
| Axonopus furcatus (Flueggé) Hitchc. | big carpetgrass |
| Cerastium fontanum Baumg. ssp. vulgare (Hartm.) Greuter & Burdet | big chickweed |
| Spartina cynosuroides (L.) Roth | big cordgrass |
| Bidens vulgata Greene | big devils beggartick |
| Nymphoides aquatica (J.F. Gmel.) Kuntze | big floatingheart |
| Verbena bracteata Cav. ex Lag. & Rodr. | bigbract verbena |
| Malus ×platycarpa Rehder (pro sp.) [coronaria × pumila] | bigfruit crab |
| Crataegus macrosperma Ashe | bigfruit hawthorn |
| Juncus megacephalus M.A. Curtis | bighead rush |
| Eurybia macrophylla (L.) Cass. | bigleaf aster |
| Magnolia macrophylla Michx. | bigleaf magnolia |
| Vinca major L. | bigleaf periwinkle |
| Styrax grandifolius Aiton | bigleaf snowbell |
| Bignonia L. | bignonia |
| Sesbania herbacea (Mill.) McVaugh | bigpod sesbania |
| Cuscuta indecora Choisy | bigseed alfalfa dodder |
| Isoetes macrospora Durieu | big-spore quillwort |
| Populus grandidentata Michx. | bigtooth aspen |
| Eragrostis hirsuta (Michx.) Nees | bigtop lovegrass |
| Echinochloa frumentacea Link | billion-dollar grass |
| Grewia biloba G. Don | bilobed grewia |
| Convolvulus L. | bindweed |
| Betula L. | birch |
| Vicia cracca L. | bird vetch |
| Sagina procumbens L. | birdeye pearlwort |
| Veronica persica Poir. | birdeye speedwell |
| Viola pedata L. | birdfoot violet |
| Lotus corniculatus L. | bird’s-foot trefoil |
| Aegopodium podagraria L. | bishop’s goutweed |
| Rumex obtusifolius L. | bitter dock |
| Panicum amarum Elliott | bitter panicgrass |
| Cardamine L. | bittercress |
| Carya cordiformis (Wangenh.) K. Koch | bitternut hickory |
| Celastrus L. | bittersweet |
| Fraxinus nigra Marshall | black ash |
| Phyllostachys nigra (Lodd. ex Lindl.) Munro | black bamboo |
| Actaea racemosa L. | black baneberry |
| Polygonum convolvulus L. | black bindweed |
| Actaea racemosa L. var. racemosa | black bugbane |
| Prunus serotina Ehrh. | black cherry |
| Aronia melanocarpa (Michx.) Elliott | black chokeberry |
| Carex nigromarginata Schwein. | black edge sedge |
| Sambucus nigra L. | black elderberry |
| Vaccinium fuscatum Aiton | black highbush blueberry |
| Gaylussacia baccata (Wangenh.) K. Koch | black huckleberry |
| Robinia pseudoacacia L. | black locust |
| Acer nigrum Michx. f. | black maple |
| Medicago lupulina L. | black medick |
| Brassica nigra (L.) W.D.J. Koch | black mustard |
| Solanum nigrum L. | black nightshade |
| Quercus velutina Lam. | black oak |
| Rubus occidentalis L. | black raspberry |
| Juglans nigra L. | black walnut |
| Salix nigra Marshall | black willow |
| Rubus L. | blackberry |
| Belamcanda chinensis (L.) DC. | blackberry lily |
| Rudbeckia hirta L. | blackeyed Susan |
| Isoetes melanopoda Gay & Durieu ex Durieu | blackfoot quillwort |
| Eleocharis melanocarpa Torr. | blackfruit spikerush |
| Nyssa sylvatica Marshall | blackgum |
| Viburnum prunifolium L. | blackhaw |
| Quercus marilandica Münchh. | blackjack oak |
| Plantago rugelii Decne. | blackseed plantain |
| Patis racemosa (Sm.) Romasch., P.M. Peterson & R. J. Soreng | blackseed ricegrass |
| Piptochaetium avenaceum (L.) Parodi | blackseed speargrass |
| Seymeria Pursh | blacksenna |
| Asplenium resiliens Kunze | blackstem spleenwort |
| Silene latifolia Poir. | bladder campion |
| Cystopteris Bernh. | bladderfern |
| Staphylea L. | bladdernut |
| Lesquerella S. Watson | bladderpod |
| Utricularia L. | bladderwort |
| Gaillardia Foug. | blanketflower |
| Liatris Gaertn. ex Schreb. | blazing star |
| Dicentra Bernh. | bleeding heart |
| Silybum marianum (L.) Gaertn. | blessed milkthistle |
| Cnicus benedictus L. | blessed thistle |
| Papaver dubium L. | blindeyes |
| Ranunculus recurvatus Poir. | blisterwort |
| Dichanthelium consanguineum (Kunth) Gould & C.A. Clark | blood panicgrass |
| Iresine P. Br. | bloodleaf |
| Sanguinaria L. | bloodroot |
| Fraxinus quadrangulata Michx. | blue ash |
| Caulophyllum thalictroides (L.) Michx. | blue cohosh |
| Collinsia Nutt. | blue eyed Mary |
| Sherardia arvensis L. | blue fieldmadder |
| Linum perenne L. | blue flax |
| Gaylussacia frondosa (L.) Torr. & A. Gray ex Torr. | blue huckleberry |
| Amphicarpum purshii Kunth | blue maidencane |
| Conoclinium coelestinum (L.) DC. | blue mistflower |
| Hosta ventricosa (Salisb.) Stearn | blue plantain lily |
| Cardamine flagellifera O.E. Schulz | Blue Ridge bittercress |
| Vaccinium pallidum Aiton | Blue Ridge blueberry |
| Smilax lasioneura Hook. | Blue Ridge carrionflower |
| Silene ovata Pursh | Blue Ridge catchfly |
| Carex lucorum Willd. ex Link | Blue Ridge sedge |
| Scutellaria arguta Buckley | Blue Ridge skullcap |
| Hypericum mitchellianum Rydb. | Blue Ridge St. Johnswort |
| Carex glaucodea Tuck. ex Olney | blue sedge |
| Scutellaria lateriflora L. | blue skullcap |
| Fuirena coerulescens Steud. | blue umbrella-sedge |
| Bacopa caroliniana (Walter) B.L. Rob. | blue waterhyssop |
| Cuphea viscosissima Jacq. | blue waxweed |
| Baptisia australis (L.) R. Br. | blue wild indigo |
| Clintonia Raf. | bluebead |
| Campanula rotundifolia L. | bluebell bellflower |
| Mertensia Roth | bluebells |
| Vaccinium L. | blueberry |
| Trichostema L. | bluecurls |
| Echium pustulatum Sm. | bluedevil |
| Sisyrinchium L. | blue-eyed grass |
| Eryngium integrifolium Walter | blueflower eryngo |
| Poa L. | bluegrass |
| Buchnera L. | bluehearts |
| Quercus incana W. Bartram | bluejack oak |
| Tradescantia ohiensis Raf. | bluejacket |
| Calamagrostis canadensis (Michx.) P. Beauv. | bluejoint |
| Amsonia Walter | bluestar |
| Andropogon L. | bluestem |
| Houstonia L. | bluet |
| Burmannia L. | bluethread |
| Carex tribuloides Wahlenb. | blunt broom sedge |
| Eleocharis obtusa (Willd.) Schult. | blunt spikerush |
| Galium obtusum Bigelow | bluntleaf bedstraw |
| Moehringia lateriflora (L.) Fenzl | bluntleaf sandwort |
| Hydrophyllum canadense L. | bluntleaf waterleaf |
| Woodsia obtusa (Spreng.) Torr. | bluntlobe cliff fern |
| Botrychium oneidense (Gilbert) House | bluntlobe grapefern |
| Poa paludigena Fernald & Wiegand | bog bluegrass |
| Thelypteris simulata (Davenport) Nieuwl. | bog fern |
| Solidago uliginosa Nutt. | bog goldenrod |
| Juncus biflorus Elliott | bog rush |
| Polygonum setaceum Baldw. | bog smartweed |
| Lindera subcoriacea B.E. Wofford | bog spicebush |
| Viola lanceolata L. | bog white violet |
| Epilobium leptophyllum Raf. | bog willowherb |
| Rorippa palustris (L.) Besser | bog yellowcress |
| Xyris difformis Chapm. | bog yelloweyed grass |
| Lachnocaulon Kunth | bogbutton |
| Wolffiella Hegelm. | bogmat |
| Croton bonplandianus Baill. | Bonpland’s croton |
| Borago L. | borage |
| Ligustrum obtusifolium Siebold & Zucc. | border privet |
| Oldenlandia boscii (DC.) Chapm. | Bosc’s mille graines |
| Dichanthelium boscii (Poir.) Gould & C.A. Clark | Bosc’s panicgrass |
| Gentiana clausa Raf. | bottle gentian |
| Lagenaria siceraria (Molina) Standl. | bottle gourd |
| Isolepis hystrix (Thunb.) Nees | bottlebrush bulrush |
| Carex hystericina Muhl. ex Willd. | bottlebrush sedge |
| Rubus leviculus L.H. Bailey | bottomland dewberry |
| Saponaria officinalis L. | bouncingbet |
| Heteranthera multiflora (Griseb.) Horn | bouquet mudplantain |
| Gillenia trifoliata (L.) Moench | Bowman’s root |
| Gaylussacia brachycera (Michx.) A. Gray | box huckleberry |
| Polygonum buxiforme Small | box knotweed |
| Acer negundo L. | boxelder |
| Buxus L. | boxwood |
| Rubus boyntonii Ashe | Boynton’s dewberry |
| Pteridium Gleditsch ex Scop. | brackenfern |
| Asplenium bradleyi D.C. Eaton | Bradley’s spleenwort |
| Crataegus brainerdii Sarg. | Brainerd’s hawthorn |
| Pteris L. | brake fern |
| Rubus suus L.H. Bailey | branched blackberry |
| Sparganium androcladum (Engelm.) Morong | branched bur-reed |
| Centaurium pulchellum (Sw.) Druce | branched centaury |
| Draba ramosissima Desv. | branched draba |
| Dicliptera brachiata (Pursh) Spreng. | branched foldwing |
| Brasenia Schreb. | brasenia |
| Verbena brasiliensis Vell. | Brazilian vervain |
| Wolffia brasiliensis Weddell | Brazilian watermeal |
| Egeria densa Planch. | Brazilian waterweed |
| Brickellia Elliott | brickellbush |
| Spiraea prunifolia Siebold & Zucc. | bridalwreath spirea |
| Aruncus dioicus (Walter) Fernald | bride’s feathers |
| Eleocharis olivacea Torr. | bright green spikerush |
| Trichomanes L. | bristle fern |
| Setaria P. Beauv. | bristlegrass |
| Carex eburnea Boott | bristleleaf sedge |
| Modiola Moench | bristlemallow |
| Ranunculus hispidus Michx. | bristly buttercup |
| Rubus hispidus L. | bristly dewberry |
| Cynosurus echinatus L. | bristly dogstail grass |
| Cyperus hystricinus Fernald | bristly flatsedge |
| Smilax tamnoides L. | bristly greenbrier |
| Robinia hispida L. | bristly locust |
| Aralia hispida Vent. | bristly sarsaparilla |
| Spermolepis echinata (Nutt. ex DC.) A. Heller | bristly scaleseed |
| Carex leptalea Wahlenb. | bristlystalked sedge |
| Cladonia cristatella Tuck. | British soldier lichen |
| Cystopteris fragilis (L.) Bernh. | brittle bladderfern |
| Najas minor All. | brittle waternymph |
| Phlox subulata L. ssp. brittonii (Small) Wherry | Britton’s phlox |
| Phegopteris hexagonoptera (Michx.) Fée | broad beechfern |
| Carex laxiflora Lam. | broad looseflower sedge |
| Sparganium eurycarpum Engelm. | broadfruit bur-reed |
| Sagittaria latifolia Willd. | broadleaf arrowhead |
| Typha latifolia L. | broadleaf cattail |
| Circaea lutetiana L. | broadleaf enchanter’s nightshade |
| Epipactis helleborine (L.) Crantz | broadleaf helleborine |
| Vernonia glauca (L.) Willd. | broadleaf ironweed |
| Dichanthelium latifolium (L.) Gould & C.A. Clark | broadleaf rosette grass |
| Carex platyphylla Carey | broadleaf sedge |
| Urochloa platyphylla (Munro ex C. Wright) R.D. Webster | broadleaf signalgrass |
| Allium ampeloprasum L. | broadleaf wild leek |
| Stachys latidens Small ex Britton | broadtooth hedgenettle |
| Carex alata Torr. | broadwing sedge |
| Bromus L. | brome |
| Vulpia bromoides (L.) Gray | brome fescue |
| Carex bromoides Schkuhr ex Willd. | brome-like sedge |
| Potentilla rivalis Nutt. | brook cinquefoil |
| Boykinia Nutt. | brookfoam |
| Samolus L. | brookweed |
| Cytisus Desf. | broom |
| Bromus scoparius L. | broom brome |
| Carex scoparia Schkuhr ex Willd. | broom sedge |
| Panicum miliaceum L. ssp. miliaceum | broomcorn millet |
| Orobanche L. | broomrape |
| Andropogon virginicus L. | broomsedge bluestem |
| Amphiachyris (A. DC.) Nutt. | broomweed |
| Broussonetia L’Hér. ex Vent. | broussonetia |
| Cyperus fuscus L. | brown flatsedge |
| Brassica juncea (L.) Czern. | brown mustard |
| Liparis liliifolia (L.) Rich. ex Ker Gawl. | brown widelip orchid |
| Rudbeckia triloba L. | browneyed Susan |
| Juncus pelocarpus E. Mey. | brownfruit rush |
| Rhynchospora capitellata (Michx.) Vahl | brownish beaksedge |
| Carex brunnescens (Pers.) Poir. | brownish sedge |
| Centaurea jacea L. | brownray knapweed |
| Microstegium Nees | browntop |
| Urochloa ramosa (L.) Nguyen | browntop millet |
| Menyanthes L. | buckbean |
| Aesculus L. | buckeye |
| Buckleya Torr. | buckleya |
| Pediomelum canescens (Michx.) Rydb. | buckroot |
| Frangula Mill. | buckthorn |
| Sideroxylon lycioides L. | buckthorn bully |
| Eriogonum Michx. | buckwheat |
| Brunnichia Banks ex Gaertn. | buckwheat vine |
| Trifolium reflexum L. | buffalo clover |
| Pyrularia pubera Michx. | buffalo nut |
| Solanum rostratum Dunal | buffalobur nightshade |
| Bouteloua dactyloides (Nutt.) J.T. Columbus | buffalograss |
| Trautvetteria Fisch. & C.A. Mey. | bugbane |
| Ajuga L. | bugle |
| Anchusa L. | bugloss |
| Buglossoides Moench | buglossoides |
| Polygonum baldschuanicum Regel | Bukhara fleeceflower |
| Cystopteris bulbifera (L.) Bernh. | bulblet bladderfern |
| Cicuta bulbifera L. | bulblet-bearing water hemlock |
| Cardamine bulbosa (Schreb. ex Muhl.) Britton, Sterns & Poggenb. | bulbous bittercress |
| Poa bulbosa L. | bulbous bluegrass |
| Phalaris aquatica L. | bulbous canarygrass |
| Luzula bulbosa (Alph. Wood) Smyth & Smyth | bulbous woodrush |
| Paspalum boscianum Flueggé | bull crowngrass |
| Cirsium vulgare (Savi) Ten. | bull thistle |
| Sagittaria lancifolia L. | bulltongue arrowhead |
| Sideroxylon L. | bully |
| Bolboschoenus (Asch.) Palla | bulrush |
| Cornus canadensis L. | bunchberry dogwood |
| Rhynchospora cephalantha A. Gray | bunched beaksedge |
| Desmanthus Willd. | bundleflower |
| Bupleurum L. | bupleurum |
| Anthriscus caucalis M. Bieb. | bur chervil |
| Sicyos L. | bur cucumber |
| Tragus Haller | bur grass |
| Quercus macrocarpa Michx. | bur oak |
| Medicago polymorpha L. | burclover |
| Arctium L. | burdock |
| Echinodorus Rich. ex Engelm. | burhead |
| Arabis laevigata (Muhl. ex Willd.) Poir. var. burkii Porter | Burk’s smooth rockcress |
| Sanguisorba L. | burnet |
| Pimpinella L. | burnet saxifrage |
| Bassia scoparia (L.) A.J. Scott | burningbush |
| Erechtites Raf. | burnweed |
| Sparganium L. | bur-reed |
| Carex sparganioides Muhl. ex Willd. | bur-reed sedge |
| Soliva Ruiz & Pav. | burrweed |
| Euonymus americanus L. | bursting-heart |
| Diervilla Mill. | bush honeysuckle |
| Quercus ×bushii Sarg. [marilandica × velutina] | Bush oak |
| Hyptis Jacq. | bushmint |
| Chenopodium berlandieri Moq. var. bushianum (Aellen) Cronquist | Bush’s goosefoot |
| Carex bushii Mack. | Bush’s sedge |
| Andropogon glomeratus (Walter) Britton, Sterns & Poggenb. | bushy bluestem |
| Polygonum ramosissimum Michx. | bushy knotweed |
| Borrichia frutescens (L.) DC. | bushy seaside tansy |
| Hypericum densiflorum Pursh | bushy St. Johnswort |
| Linaria vulgaris Mill. | butter and eggs |
| Ranunculus L. | buttercup |
| Asclepias tuberosa L. | butterfly milkweed |
| Centrosema (DC.) Benth. | butterfly pea |
| Buddleja L. | butterflybush |
| Juglans cinerea L. | butternut |
| Eryngium yuccifolium Michx. | button eryngo |
| Carex bullata Schkuhr ex Willd. | button sedge |
| Cephalanthus L. | buttonbush |
| Cuscuta cephalanthi Engelm. | buttonbush dodder |
| Diodia L. | buttonweed |
| Carex buxbaumii Wahlenb. | Buxbaum’s sedge |
| Brassica oleracea L. | cabbage |
| Calamintha Mill. | calamint |
| Acorus calamus L. | calamus |
| Lathyrus hirsutus L. | Caley pea |
| Calibrachoa Llave & Lex. | calibrachoa |
| Symphyotrichum lateriflorum (L.) Á. Löve & D. Löve | calico aster |
| Urtica dioica L. ssp. gracilis (Aiton) Seland. | California nettle |
| Ligustrum ovalifolium Hassk. | California privet |
| Pyrus calleryana Decne. | Callery pear |
| Camassia Lindl. | camas |
| Narcissus ×odorus L. (pro sp.) [jonquilla × pseudonarcissus] | Campernelle jonquil |
| Pluchea camphorata (L.) DC. | camphor pluchea |
| Heterotheca subaxillaris (Lam.) Britton & Rusby | camphorweed |
| Lychnis L. | campion |
| Campsis Lour. | campsis |
| Poa compressa L. | Canada bluegrass |
| Xanthium strumarium L. var. canadense (Mill.) Torr. & A. Gray | Canada cocklebur |
| Teucrium canadense L. | Canada germander |
| Solidago altissima L. | Canada goldenrod |
| Lactuca canadensis L. | Canada lettuce |
| Lilium canadense L. | Canada lily |
| Maianthemum canadense Desf. | Canada mayflower |
| Cirsium arvense (L.) Scop. | Canada thistle |
| Nuttallanthus canadensis (L.) D.A. Sutton | Canada toadflax |
| Elymus canadensis L. | Canada wildrye |
| Taxus canadensis Marshall | Canada yew |
| Anemone canadensis L. | Canadian anemone |
| Sanicula canadensis L. | Canadian blacksnakeroot |
| Sanguisorba canadensis L. | Canadian burnet |
| Pilea pumila (L.) A. Gray | Canadian clearweed |
| Cryptotaenia canadensis (L.) DC. | Canadian honewort |
| Conyza canadensis (L.) Cronquist | Canadian horseweed |
| Ligusticum canadense (L.) Britton | Canadian licorice-root |
| Pedicularis canadensis L. | Canadian lousewort |
| Astragalus canadensis L. | Canadian milkvetch |
| Antennaria howellii Greene ssp. canadensis (Greene) Bayer | Canadian pussytoes |
| Juncus canadensis J. Gay ex Laharpe | Canadian rush |
| Amelanchier canadensis (L.) Medik. | Canadian serviceberry |
| Houstonia canadensis Willd. ex Roem. & Schult. | Canadian summer bluet |
| Elodea canadensis Michx. | Canadian waterweed |
| Viola canadensis L. | Canadian white violet |
| Asarum canadense L. | Canadian wildginger |
| Laportea canadensis (L.) Weddell | Canadian woodnettle |
| Phalaris L. | canarygrass |
| Schoenoplectus etuberculatus (Steud.) Soják | Canby’s bulrush |
| Paxistima canbyi A. Gray | Canby’s mountain-lover |
| Conopholis Wallr. | cancer-root |
| Kickxia Dumort. | cancerwort |
| Arundinaria Michx. | cane |
| Carex austrodeflexa P.D. McMillan, Sorrie & van Eerden | canebrake sedge |
| Prenanthes serpentaria Pursh | cankerweed |
| Canna L. | canna |
| Canna ×generalis L.H. Bailey (pro sp.) [glauca × indica] | canna lily |
| Cucumis melo L. | cantaloupe |
| Bulbostylis ciliatifolia (Elliott) Fernald | capillary hairsedge |
| Capsella Medik. | capsella |
| Carum carvi L. | caraway |
| Lobelia cardinalis L. | cardinalflower |
| Amaranthus palmeri S. Watson | carelessweed |
| Carex careyana Torr. ex Dewey | Carey’s sedge |
| Heuchera caroliniana (Rosend., Butters & Lakela) E.F. Wells | Carolina alumroot |
| Fraxinus caroliniana Mill. | Carolina ash |
| Modiola caroliniana (L.) G. Don | Carolina bristlemallow |
| Frangula caroliniana (Walter) A. Gray | Carolina buckthorn |
| Trautvetteria caroliniensis (Walter) Vail | Carolina bugbane |
| Phalaris caroliniana Walter | Carolina canarygrass |
| Trifolium carolinianum Michx. | Carolina clover |
| Cocculus carolinus (L.) DC. | Carolina coralbead |
| Pyrrhopappus carolinianus (Walter) DC. | Carolina desert-chicory |
| Boltonia caroliniana (Walter) Fernald | Carolina doll’s daisy |
| Elephantopus carolinianus Raeusch. | Carolina elephantsfoot |
| Stylodon carneus (Medik.) Moldenke | Carolina false vervain |
| Cabomba caroliniana A. Gray | Carolina fanwort |
| Fimbristylis caroliniana (Lam.) Fernald | Carolina fimbry |
| Alopecurus carolinianus Walter | Carolina foxtail |
| Geranium carolinianum L. | Carolina geranium |
| Lilaeopsis carolinensis J.M. Coult. & Rose | Carolina grasswort |
| Tsuga caroliniana Engelm. | Carolina hemlock |
| Ilex ambigua (Michx.) Torr. | Carolina holly |
| Solanum carolinense L. | Carolina horsenettle |
| Kalmia carolina Small | Carolina laurel |
| Phyllanthus caroliniensis Walter | Carolina leaf-flower |
| Lilium michauxii Poir. | Carolina lily |
| Azolla caroliniana Willd. | Carolina mosquitofern |
| Scleria pauciflora Muhl. ex Willd. var. caroliniana (Willd.) Alph. Wood | Carolina nutrush |
| Danthonia epilis Scribn. | Carolina oatgrass |
| Dichondra carolinensis Michx. | Carolina ponysfoot |
| Populus ×canadensis Moench (pro sp.) [deltoides × nigra] | Carolina poplar |
| Lithospermum caroliniense (Walter ex J.F. Gmel.) MacMill. | Carolina puccoon |
| Lachnanthes caroliana (Lam.) Dandy | Carolina redroot |
| Rosa carolina L. | Carolina rose |
| Saxifraga caroliniana A. Gray | Carolina saxifrage |
| Carex caroliniana Schwein. | Carolina sedge |
| Pityopsis aspera (Shuttlw. ex Small) Small var. adenolepis (Fernald) Semple & F.D. Bowers | Carolina silkgrass |
| Sphagnum carolinianum R.E. Andrus | Carolina sphagnum |
| Claytonia caroliniana Michx. | Carolina springbeauty |
| Vicia caroliniana Walter | Carolina vetch |
| Viola villosa Walter | Carolina violet |
| Ruellia caroliniensis (J.F. Gmel.) Steud. | Carolina wild petunia |
| Luzula acuminata Raf. ssp. carolinae (S. Watson) Z. Kaplan | Carolina woodrush |
| Xyris caroliniana Walter | Carolina yelloweyed grass |
| Scrophularia marilandica L. | carpenter’s square |
| Arthraxon P. Beauv. | carpetgrass |
| Mollugo L. | carpetweed |
| Carum L. | carum |
| Kalopanax Miq. | castor aralia |
| Ricinus communis L. | castorbean |
| Smilax glauca Walter | cat greenbrier |
| Catalpa Scop. | catalpa |
| Rhododendron catawbiense Michx. | Catawba rosebay |
| Silene L. | catchfly |
| Leersia lenticularis Michx. | catchfly grass |
| Calystegia catesbeiana Pursh | Catesby’s false bindweed |
| Nepeta L. | catnip |
| Hypochaeris L. | cat’s ear |
| Typha L. | cattail |
| Carex typhina Michx. | cattail sedge |
| Capsicum annuum L. | cayenne pepper |
| Ceanothus L. | ceanothus |
| Chamaecyparis Spach | cedar |
| Hypericum frondosum Michx. | cedarglade St. Johnswort |
| Chelidonium L. | celandine |
| Stylophorum diphyllum (Michx.) Nutt. | celandine poppy |
| Centaurium Hill | centaury |
| Centella L. | centella |
| Eremochloa Büse | centipede grass |
| Secale cereale L. | cereal rye |
| Carphephorus Cass. | chaffhead |
| Schwalbea americana L. | chaffseed |
| Anagallis minima (L.) Krause | chaffweed |
| Woodwardia Sm. | chainfern |
| Schoenoplectus americanus (Pers.) Volkart ex Schinz & R. Keller | chairmaker’s bulrush |
| Andropogon capillipes Nash | chalky bluestem |
| Chamaelirium Willd. | chamaelirium |
| Phyllanthus urinaria L. | chamber bitter |
| Anthemis L. | chamomile |
| Myosotis discolor Pers. | changing forget-me-not |
| Poa chapmaniana Scribn. | Chapman’s bluegrass |
| Carex chapmanii Steud. | Chapman’s sedge |
| Tridens flavus (L.) Hitchc. var. chapmanii (Small) Shinners | Chapman’s tridens |
| Sinapis arvensis L. | charlock mustard |
| Vitex L. | chastetree |
| Bromus tectorum L. | cheatgrass |
| Helianthus ×laetiflorus Pers. (pro sp.) [pauciflorus × tuberosus] | cheerful sunflower |
| Rosa laevigata Michx. | Cherokee rose |
| Carex cherokeensis Schwein. | Cherokee sedge |
| Elaeagnus multiflora Thunb. | cherry silverberry |
| Quercus pagoda Raf. | cherrybark oak |
| Anthriscus Pers. | chervil |
| Rubus pascuus L.H. Bailey | Chesapeake blackberry |
| Castanea Mill. | chestnut |
| Quercus montana Willd. | chestnut oak |
| Prunus angustifolia Marshall | Chickasaw plum |
| Sarcocornia perennis (Mill.) A.J. Scott | chickenclaws |
| Cichorium L. | chicory |
| Petrorhagia prolifera (L.) P.W. Ball & Heywood | childing pink |
| Melia azedarach L. | Chinaberrytree |
| Castanea mollissima Blume | Chinese chestnut |
| Lycium chinense Mill. | Chinese desert-thorn |
| Ulmus parvifolia Jacq. | Chinese elm |
| Boehmeria nivea (L.) Gaudich. | Chinese grass |
| Firmiana simplex (L.) W. Wight | Chinese parasoltree |
| Pyrus pyrifolia (Burm. f.) Nakai | Chinese pear |
| Ligustrum sinense Lour. | Chinese privet |
| Rosa chinensis Jacq. | Chinese rose |
| Miscanthus sinensis Andersson | Chinese silvergrass |
| Wisteria sinensis (Sims) DC. | Chinese wisteria |
| Dioscorea oppositifolia L. | Chinese yam |
| Castanea pumila (L.) Mill. | chinquapin |
| Quercus muehlenbergii Engelm. | chinquapin oak |
| Akebia Decne. | chocolate vine |
| Prunus virginiana L. | chokecherry |
| Chondrilla L. | chondrilla |
| Polystichum acrostichoides (Michx.) Schott | Christmas fern |
| Themeda arguens (L.) Hack. | Christmas grass |
| Chrysogonum L. | chrysogonum |
| Aristida dichotoma Michx. | churchmouse threeawn |
| Osmunda cinnamomea L. | cinnamon fern |
| Rosa cinnamomea L. | cinnamon rose |
| Potentilla L. | cinquefoil |
| Dysphania pumilio (R. Br.) Mosyakin & Clemants | clammy goosefoot |
| Physalis heterophylla Nees | clammy groundcherry |
| Gratiola neglecta Torr. | clammy hedgehyssop |
| Robinia viscosa Vent. | clammy locust |
| Polanisia Raf. | clammyweed |
| Heliotropium amplexicaule Vahl | clasping heliotrope |
| Asclepias amplexicaulis Sm. | clasping milkweed |
| Lepidium perfoliatum L. | clasping pepperweed |
| Triodanis perfoliata (L.) Nieuwl. | clasping Venus’ looking-glass |
| Lycopus amplectens Raf. | clasping water horehound |
| Potamogeton perfoliatus L. | claspingleaf pondweed |
| Hypericum gymnanthum Engelm. & A. Gray | claspingleaf St. Johnswort |
| Microthlaspi perfoliatum (L.) F.K. Mey. | claspleaf pennycress |
| Streptopus amplexifolius (L.) DC. | claspleaf twistedstalk |
| Osmorhiza claytonii (Michx.) C.B. Clarke | Clayton’s sweetroot |
| Pilea Lindl. | clearweed |
| Woodsia R. Br. | cliff fern |
| Sedum glaucophyllum R.T. Clausen | cliff stonecrop |
| Pellaea Link | cliffbrake |
| Commelina diffusa Burm. f. | climbing dayflower |
| Trachelospermum difforme (Walter) A. Gray | climbing dogbane |
| Polygonum scandens L. | climbing false buckwheat |
| Lygodium Sw. | climbing fern |
| Mikania scandens (L.) Willd. | climbing hempvine |
| Matelea obliqua (Jacq.) Woodson | climbing milkvine |
| Solanum dulcamara L. | climbing nightshade |
| Rosa setigera Michx. | climbing rose |
| Stachys clingmanii Small | Clingman’s hedgenettle |
| Clinopodium L. | clinopodium |
| Gentiana andrewsii Griseb. | closed bottle gentian |
| Trifolium L. | clover |
| Cuscuta epithymum (L.) L. | clover dodder |
| Huperzia Bernh. | clubmoss |
| Rhynchospora glomerata (L.) Vahl | clustered beaksedge |
| Sanicula odorata (Raf.) K.M. Pryer & L.R. Phillippe | clustered blacksnakeroot |
| Rumex conglomeratus Murray | clustered dock |
| Festuca paradoxa Desv. | clustered fescue |
| Carex praegracilis W. Boott | clustered field sedge |
| Oldenlandia uniflora L. | clustered mille graines |
| Pycnanthemum muticum (Michx.) Pers. | clustered mountainmint |
| Flaveria trinervia (Spreng.) C. Mohr | clustered yellowtops |
| Jacquemontia Choisy | clustervine |
| Cnicus L. | cnicus |
| Cnidoscolus Pohl | cnidoscolus |
| Echinochloa walteri (Pursh) A. Heller | coast cockspur grass |
| Galium hispidulum Michx. | coastal bedstraw |
| Leucothoe axillaris (Lam.) D. Don | coastal doghobble |
| Triantha racemosa (Walter) Small | coastal false asphodel |
| Polygonella articulata (L.) Meisn. | coastal jointweed |
| Eragrostis refracta (Muhl.) Scribn. | coastal lovegrass |
| Panicum amarum Elliott var. amarulum (Hitchc. & Chase) P.G. Palmer | coastal panicgrass |
| Rhynchospora stenophylla Chapm. | coastal plain beaksedge |
| Sisyrinchium fuscatum E.P. Bicknell | coastal plain blue-eyed grass |
| Eutrochium dubium (Willd. ex Poir.) E.E. Lamont | coastal plain joe pye weed |
| Dichanthelium longiligulatum (Nash) Freckmann | coastal plain panicgrass |
| Carex crebriflora Wiegand | coastal plain sedge |
| Salix caroliniana Michx. | coastal plain willow |
| Xyris ambigua Bey. ex Kunth | coastal plain yelloweyed grass |
| Sabatia calycina (Lam.) A. Heller | coastal rose gentian |
| Euphorbia exserta (Small) Coker | coastal sand spurge |
| Cenchrus spinifex Cav. | coastal sandbur |
| Amelanchier obovalis (Michx.) Ashe | coastal serviceberry |
| Clethra alnifolia L. | coastal sweetpepperbush |
| Xanthium L. | cocklebur |
| Celosia L. | cock’s comb |
| Echinochloa P. Beauv. | cockspur grass |
| Crataegus crus-galli L. | cockspur hawthorn |
| Gymnocladus Lam. | coffeetree |
| Imperata cylindrica (L.) P. Beauv. | cogongrass |
| Caulophyllum Michx. | cohosh |
| Aletris L. | colicroot |
| Carex collinsii Nutt. | Collins’ sedge |
| Cuphea carthagenensis (Jacq.) J.F. Macbr. | Colombian waxweed |
| Agrostis capillaris L. | colonial bentgrass |
| Tussilago L. | coltsfoot |
| Wolffia columbiana Karst. | Columbian watermeal |
| Aquilegia L. | columbine |
| Proserpinaca pectinata Lam. | combleaf mermaidweed |
| Aureolaria pectinata (Nutt.) Pennell | combleaf yellow false foxglove |
| Panicum rigidulum Bosc ex Nees var. combsii (Scribn. & C.R. Ball) Lelong | Combs’ panicgrass |
| Symphytum L. | comfrey |
| Melissa officinalis L. | common balm |
| Berberis vulgaris L. | common barberry |
| Hordeum vulgare L. | common barley |
| Beta vulgaris L. | common beet |
| Utricularia macrorhiza Leconte | common bladderwort |
| Viola sororia Willd. | common blue violet |
| Symphyotrichum cordifolium (L.) G.L. Nesom | common blue wood aster |
| Eupatorium perfoliatum L. | common boneset |
| Borago officinalis L. | common borage |
| Buxus sempervirens L. | common box |
| Rhamnus cathartica L. | common buckthorn |
| Ajuga reptans L. | common bugle |
| Cephalanthus occidentalis L. | common buttonbush |
| Axonopus fissifolius (Raddi) Kuhlm. | common carpetgrass |
| Silene gallica L. | common catchfly |
| Stellaria media (L.) Vill. | common chickweed |
| Potentilla simplex Michx. | common cinquefoil |
| Symphytum officinale L. | common comfrey |
| Agrostemma githago L. | common corncockle |
| Filago vulgaris Lam. | common cottonrose |
| Heracleum maximum W. Bartram | common cowparsnip |
| Taraxacum officinale F.H. Wigg. | common dandelion |
| Cunila origanoides (L.) Britton | common dittany |
| Erucastrum gallicum (Willd.) O.E. Schulz | common dogmustard |
| Spirodela polyrrhiza (L.) Schleid. | common duckmeat |
| Lemna minor L. | common duckweed |
| Oenothera biennis L. | common evening primrose |
| Amsinckia menziesii (Lehm.) A. Nelson & J.F. Macbr. var. intermedia (Fisch. & C.A. Mey.) Ganders | common fiddleneck |
| Linum usitatissimum L. | common flax |
| Gomphrena globosa L. | common globe amaranth |
| Hypoxis hirsuta (L.) Coville | common goldstar |
| Ulex europaeus L. | common gorse |
| Muscari botryoides (L.) Mill. | common grape hyacinth |
| Veronica officinalis L. | common gypsyweed |
| Celtis occidentalis L. | common hackberry |
| Sclerochloa dura (L.) P. Beauv. | common hardgrass |
| Humulus lupulus L. | common hop |
| Ptelea trifoliata L. | common hoptree |
| Sempervivum tectorum L. | common houseleek |
| Juniperus communis L. | common juniper |
| Athyrium filix-femina (L.) Roth | common ladyfern |
| Arnica acaulis (Walter) Britton, Sterns & Poggenb. | common leopardbane |
| Syringa vulgaris L. | common lilac |
| Adiantum capillus-veneris L. | common maidenhair |
| Malva neglecta Wallr. | common mallow |
| Althaea officinalis L. | common marshmallow |
| Asclepias syriaca L. | common milkweed |
| Menispermum canadense L. | common moonseed |
| Leonurus cardiaca L. | common motherwort |
| Cerastium fontanum Baumg. | common mouse-ear chickweed |
| Verbascum thapsus L. | common mullein |
| Physocarpus opulifolius (L.) Maxim., orth. cons. | common ninebark |
| Lapsana communis L. | common nipplewort |
| Avena sativa L. | common oat |
| Pyrus communis L. | common pear |
| Exochorda racemosa (Lindl.) Rehder | common pearlbrush |
| Lepidium densiflorum Schrad. | common pepperweed |
| Vinca minor L. | common periwinkle |
| Diospyros virginiana L. | common persimmon |
| Plantago major L. | common plantain |
| Zanthoxylum americanum Mill. | common pricklyash |
| Phragmites australis (Cav.) Trin. ex Steud. | common reed |
| Ruta graveolens L. | common rue |
| Juncus effusus L. | common rush |
| Prunella vulgaris L. | common selfheal |
| Amelanchier arborea (Michx. f.) Fernald | common serviceberry |
| Rumex acetosella L. | common sheep sorrel |
| Helenium autumnale L. | common sneezeweed |
| Symphoricarpos albus (L.) S.F. Blake | common snowberry |
| Sonchus oleraceus L. | common sowthistle |
| Eleocharis palustris (L.) Roem. & Schult. | common spikerush |
| Hypericum perforatum L. | common St. Johnswort |
| Helianthus annuus L. | common sunflower |
| Symplocos tinctoria (L.) L’Hér. | common sweetleaf |
| Tanacetum vulgare L. | common tansy |
| Acalypha rhomboidea Raf. | common threeseed mercury |
| Schoenoplectus pungens (Vahl) Palla | common threesquare |
| Holcus lanatus L. | common velvetgrass |
| Echium vulgare L. | common viper’s bugloss |
| Eichhornia crassipes (Mart.) Solms | common water hyacinth |
| Triticum aestivum L. | common wheat |
| Ilex verticillata (L.) A. Gray | common winterberry |
| Luzula multiflora (Ehrh.) Lej. | common woodrush |
| Artemisia vulgaris L. | common wormwood |
| Achillea millefolium L. | common yarrow |
| Oxalis stricta L. | common yellow oxalis |
| Bromus madritensis L. | compact brome |
| Cuscuta compacta Juss. ex Choisy | compact dodder |
| Silphium laciniatum L. | compassplant |
| Sporobolus compositus (Poir.) Merr. | composite dropseed |
| Saccharum coarctatum (Fernald) R. Webster | compressed plumegrass |
| Quercus ×comptoniae Sarg. [lyrata × virginiana] | Compton oak |
| Eleocharis tuberculosa (Michx.) Roem. & Schult. | cone-cup spikerush |
| Rudbeckia L. | coneflower |
| Convallaria L. | convallaria |
| Sullivantia Torr. & A. Gray ex A. Gray | coolwort |
| Ceratophyllum demersum L. | coon’s tail |
| Astragalus neglectus (Torr. & A. Gray) Sheldon | Cooper’s milkvetch |
| Crataegus intricata Lange | Copenhagen hawthorn |
| Acalypha L. | copperleaf |
| Hypericum denticulatum Walter | coppery St. Johnswort |
| Smilax walteri Pursh | coral greenbrier |
| Cocculus DC. | coralbead |
| Symphoricarpos orbiculatus Moench | coralberry |
| Corallorhiza Gagnebin, orth. cons. | coralroot |
| Spartina Schreb. | cordgrass |
| Coriandrum L. | coriander |
| Salix matsudana Koidzumi | corkscrew willow |
| Zea L. | corn |
| Anthemis arvensis L. | corn chamomile |
| Buglossoides arvensis (L.) I.M. Johnst. | corn gromwell |
| Papaver rhoeas L. | corn poppy |
| Veronica arvensis L. | corn speedwell |
| Spergula arvensis L. | corn spurry |
| Agrostemma L. | corncockle |
| Glebionis segetum (L.) Fourr. | corndaisy |
| Doellingeria infirma (Michx.) Greene | cornel-leaf whitetop |
| Valerianella Mill. | cornsalad |
| Bolboschoenus maritimus (L.) Palla | cosmopolitan bulrush |
| Cosmos Cav. | cosmos |
| Gossypium L. | cotton |
| Pseudognaphalium stramineum (Kunth) Anderb. | cottonbatting plant |
| Eriophorum L. | cottongrass |
| Filago Loefl. | cottonrose |
| Onopordum L. | cottonthistle |
| Populus L. | cottonwood |
| Chrysopsis gossypina (Michx.) Elliott | cottony goldenaster |
| Phacelia covillei S. Watson | Coville’s phacelia |
| Vaccaria hispanica (Mill.) Rauschert | cow soapwort |
| Oxypolis Raf. | cowbane |
| Heracleum L. | cowparsnip |
| Vigna Savi | cowpea |
| Melampyrum L. | cowwheat |
| Digitaria Haller | crabgrass |
| Salix fragilis L. | crack willow |
| Acarospora A. Massal. | cracked lichen |
| Vaccinium macrocarpon Aiton | cranberry |
| Lagerstroemia indica L. | crapemyrtle |
| Quercus ×cravenensis Little [incana × marilandica] | Craven oak |
| Carex crawei Dewey | Crawe’s sedge |
| Geum virginianum L. | cream avens |
| Narcissus tazetta L. | cream narcissus |
| Desmodium ochroleucum M.A. Curtis ex Canby | cream ticktrefoil |
| Arabis hirsuta (L.) Scop. var. pycnocarpa (M. Hopkins) Rollins | creamflower rockcress |
| Parthenocissus Planch. | creeper |
| Eurybia surculosa (Michx.) G.L. Nesom | creeping aster |
| Agrostis stolonifera L. | creeping bentgrass |
| Vaccinium crassifolium Andrews | creeping blueberry |
| Echinodorus cordifolius (L.) Griseb. | creeping burhead |
| Ranunculus repens L. | creeping buttercup |
| Potentilla reptans L. | creeping cinquefoil |
| Eryngium prostratum Nutt. ex DC. | creeping eryngo |
| Lysimachia nummularia L. | creeping jenny |
| Lespedeza repens (L.) W.P.C. Barton | creeping lespedeza |
| Liriope spicata (Thunb.) Lour. | creeping liriope |
| Glyceria acutiflora Torr. | creeping mannagrass |
| Phlox stolonifera Sims | creeping phlox |
| Ludwigia repens J.R. Forst. | creeping primrose-willow |
| Eleocharis fallax Weath. | creeping spikerush |
| Hypericum adpressum W.P.C. Barton | creeping St. Johnswort |
| Oxalis corniculata L. | creeping woodsorrel |
| Rorippa sylvestris (L.) Besser | creeping yellowcress |
| Anoda cristata (L.) Schltdl. | crested anoda |
| Hexalectris Raf. | crested coralroot |
| Cynosurus cristatus L. | crested dogstail grass |
| Atriplex cristata Humb. & Bonpl. ex Willd. | crested saltbush |
| Carex cristatella Britton | crested sedge |
| Bunias erucago L. | crested wartycabbage |
| Dryopteris cristata (L.) A. Gray | crested woodfern |
| Platanthera cristata (Michx.) Lindl. | crested yellow orchid |
| Trifolium incarnatum L. | crimson clover |
| Hibiscus moscheutos L. | crimsoneyed rosemallow |
| Cardamine diphylla (Michx.) Alph. Wood | crinkleroot |
| Tipularia discolor (Pursh) Nutt. | crippled cranefly |
| Amaranthus crispus (Lesp. & Thev.) N. Terracc. | crispleaf amaranth |
| Crocus L. | crocus |
| Symphyotrichum prenanthoides (Muhl. ex Willd.) G.L. Nesom | crookedstem aster |
| Cucurbita moschata Duchesne | crookneck squash |
| Bignonia capreolata L. | crossvine |
| Croton L. | croton |
| Dactyloctenium Willd. | crowfoot grass |
| Verbesina L. | crownbeard |
| Bidens coronata (L.) Britton | crowned beggarticks |
| Paspalum L. | crowngrass |
| Securigera DC. | crownvetch |
| Nothoscordum bivalve (L.) Britton | crowpoison |
| Sida rhombifolia L. | Cuban jute |
| Cardamine pratensis L. | cuckoo flower |
| Magnolia acuminata (L.) L. | cucumber tree |
| Helianthus debilis Nutt. | cucumberleaf sunflower |
| Gnaphalium L. | cudweed |
| Ribes rubrum L. | cultivated currant |
| Allium sativum L. | cultivated garlic |
| Raphanus sativus L. | cultivated radish |
| Nicotiana tabacum L. | cultivated tobacco |
| Veronicastrum virginicum (L.) Farw. | Culver’s root |
| Rhododendron cumberlandense E.L. Braun | Cumberland rhododendron |
| Carex cumberlandensis Naczi, Kral & Bryson | Cumberland sedge |
| Cunila D. Royen ex L. | cunila |
| Cladonia P. Browne | cup lichen |
| Silphium perfoliatum L. | cup plant |
| Eriochloa Kunth | cupgrass |
| Sacciolepis Nash | cupscale grass |
| Rumex crispus L. | curly dock |
| Carduus crispus L. | curly plumeless thistle |
| Potamogeton crispus L. | curly pondweed |
| Grindelia squarrosa (Pursh) Dunal | curlycup gumweed |
| Clematis ochroleuca Aiton | curlyheads |
| Polygonum lapathifolium L. | curlytop knotweed |
| Ribes L. | currant |
| Ranunculus sceleratus L. | cursed buttercup |
| Aristida dichotoma Michx. var. curtissii A. Gray | Curtis’ threeawn |
| Lespedeza hirta (L.) Hornem. ssp. curtissii Clewell | Curtiss’ lespedeza |
| Polygala curtissii A. Gray | Curtiss’ milkwort |
| Xyris difformis Chapm. var. curtissii (Malme) Kral | Curtiss’ yelloweyed grass |
| Parapholis incurva (L.) C.E. Hubbard | curved sicklegrass |
| Leersia Sw. | cutgrass |
| Chelone cuthbertii Small | Cuthbert’s turtlehead |
| Rubus laciniatus Willd. | cutleaf blackberry |
| Rudbeckia laciniata L. | cutleaf coneflower |
| Oenothera laciniata Hill | cutleaf evening primrose |
| Geranium dissectum L. | cutleaf geranium |
| Dysphania multifida (L.) Mosyakin & Clemants | cutleaf goosefoot |
| Botrychium dissectum Spreng. | cutleaf grapefern |
| Physalis angulata L. | cutleaf groundcherry |
| Prunella laciniata (L.) L. | cutleaf selfheal |
| Dipsacus laciniatus L. | cutleaf teasel |
| Cardamine concatenata (Michx.) Sw. | cutleaf toothwort |
| Myriophyllum pinnatum (Walter) Britton, Sterns & Poggenb. | cutleaf watermilfoil |
| Muhlenbergia expansa (Poir.) Trin. | cutover muhly |
| Cycloloma Moq. | cycloloma |
| Ludwigia glandulosa Walter | cylindricfruit primrose-willow |
| Cymbalaria Hill | cymbalaria |
| Cymophyllus Mack. ex Britton | cymophyllus |
| Dichanthelium dichotomum (L.) Gould | cypress panicgrass |
| Euphorbia cyparissias L. | cypress spurge |
| Carex joorii L.H. Bailey | cypress swamp sedge |
| Carex decomposita Muhl. | cypressknee sedge |
| Ipomoea quamoclit L. | cypressvine |
| Narcissus L. | daffodil |
| Leucanthemum Mill. | daisy |
| Dalibarda L. | dalibarda |
| Paspalum dilatatum Poir. | dallisgrass |
| Hesperis matronalis L. | dames rocket |
| Taraxacum F.H. Wigg. | dandelion |
| Carex venusta Dewey | darkgreen sedge |
| Quercus hemisphaerica W. Bartram ex Willd. | Darlington oak |
| Euphorbia purpurea (Raf.) Fernald | Darlington’s glade spurge |
| Lolium temulentum L. | Darnel ryegrass |
| Dasistoma Raf. | dasistoma |
| Euphorbia davidii Subils | David’s spurge |
| Stylisma Raf. | dawnflower |
| Commelina L. | dayflower |
| Hemerocallis L. | daylily |
| Rubus fecundus L.H. Bailey | DC dewberry |
| Lamium L. | deadnettle |
| Acalypha deamii (Weath.) H.E. Ahles | Deam’s threeseed mercury |
| Zigadenus Michx. | deathcamas |
| Decodon J.F. Gmel. | decodon |
| Decumaria L. | decumaria |
| Lycopodium tristachyum Pursh | deeproot clubmoss |
| Vaccinium stamineum L. | deerberry |
| Dichanthelium clandestinum (L.) Gould | deertongue |
| Sagittaria platyphylla (Engelm.) J.G. Sm. | delta arrowhead |
| Liatris spicata (L.) Willd. | dense blazing star |
| Polygonum glabrum Willd. | denseflower knotweed |
| Bulbostylis capillaris (L.) Kunth ex C.B. Clarke | densetuft hairsedge |
| Dianthus armeria L. | Deptford pink |
| Chenopodium pratericola Rydb. | desert goosefoot |
| Trianthema portulacastrum L. | desert horsepurslane |
| Pyrrhopappus DC. | desert-chicory |
| Lycium L. | desert-thorn |
| Nigella damascena L. | devil in the bush |
| Bidens frondosa L. | devil’s beggartick |
| Liatris scariosa (L.) Willd. | devil’s bite |
| Clematis virginiana L. | devil’s darning needles |
| Elephantopus tomentosus L. | devil’s grandmother |
| Aralia spinosa L. | devil’s walkingstick |
| Opuntia humifusa (Raf.) Raf. | devil’s-tongue |
| Osmanthus Lour. | devilwood |
| Stenaria nigricans (Lam.) Terrell var. nigricans | diamondflowers |
| Stenaria Raf. ex Steud. | diamond-flowers |
| Diamorpha Nutt. | diamorpha |
| Didiplis Raf. | didiplis |
| Anethum L. | dill |
| Veronica dillenii Crantz | Dillenius’ speedwell |
| Desmodium glabellum (Michx.) DC. | Dillenius’ ticktrefoil |
| Erythronium umbilicatum Parks & Hardin | dimpled troutlily |
| Carex sterilis Willd. | dioecious sedge |
| Diospyros L. | diospyros |
| Matricaria discoidea DC. | disc mayweed |
| Hypericum dissimulatum E.P. Bicknell | disguised St. Johnswort |
| Bacopa rotundifolia (Michx.) Wettst. | disk waterhyssop |
| Penthorum sedoides L. | ditch stonecrop |
| Botrychium jenmanii Underw. | Dixie grapefern |
| Chamaesyce bombensis (Jacq.) Dugand | dixie sandmat |
| Rumex L. | dock |
| Cuscuta L. | dodder |
| Crataegus dodgei Ashe | Dodge’s hawthorn |
| Rosa canina L. | dog rose |
| Apocynum L. | dogbane |
| Eupatorium capillifolium (Lam.) Small | dogfennel |
| Eubotrys Nutt. | doghobble |
| Erucastrum C. Presl | dogmustard |
| Cynosurus L. | dogstail grass |
| Erythronium americanum Ker Gawl. | dogtooth violet |
| Cornus L. | dogwood |
| Boltonia L’Hér. | doll’s daisy |
| Japewiella dollypartoniana J.L. Allen & Lendemer | Dolly Parton’s lichen |
| Urochloa adspersa (Trin.) R. Webster | Dominican signalgrass |
| Landoltia punctata (G. Mey.) D.H. Les & D.J. Crawford | dotted duckmeat |
| Crataegus punctata Jacq. | dotted hawthorn |
| Bacidia De Not. | dotted lichen |
| Polygonum punctatum Elliott | dotted smartweed |
| Rhynchosia difformis (Elliott) DC. | doubleform snoutbean |
| Consolida ajacis (L.) Schur | doubtful knight’s-spur |
| Geranium molle L. | dovefoot geranium |
| Heuchera pubescens Pursh | downy alumroot |
| Viburnum rafinesqueanum Schult. | downy arrowwood |
| Smilax pulverulenta Michx. | downy carrionflower |
| Potentilla intermedia L. | downy cinquefoil |
| Danthonia sericea Nutt. | downy danthonia |
| Solidago puberula Nutt. | downy goldenrod |
| Crataegus mollis Scheele | downy hawthorn |
| Lobelia puberula Michx. | downy lobelia |
| Galactia volubilis (L.) Britton | downy milkpea |
| Blephilia ciliata (L.) Benth. | downy pagoda-plant |
| Phlox pilosa L. | downy phlox |
| Goodyera pubescens (Willd.) R. Br. | downy rattlesnake plantain |
| Amelanchier arborea (Michx. f.) Fernald var. austromontana (Ashe) H.E. Ahles | downy serviceberry |
| Epilobium strictum Muhl. ex Spreng. | downy willowherb |
| Aureolaria virginica (L.) Pennell | downy yellow false foxglove |
| Viola pubescens Aiton | downy yellow violet |
| Draba L. | draba |
| Arethusa L. | dragon’s mouth |
| Scirpus lineatus Michx. | drooping bulrush |
| Carex prasina Wahlenb. | drooping sedge |
| Ornithogalum nutans L. | drooping star of Bethlehem |
| Carex arctata Boott ex Hook. | drooping woodland sedge |
| Cinna latifolia (Trevis. ex Goepp.) Griseb. | drooping woodreed |
| Sporobolus R. Br. | dropseed |
| Fumaria officinalis L. | drug fumitory |
| Polygala cruciata L. | drumheads |
| Acer rubrum L. var. drummondii (Hook. & Arn. ex Nutt.) Sarg. | Drummond’s maple |
| Carex siccata Dewey | dryspike sedge |
| Duchesnea Sm. | duchesnea |
| Landoltia D.H. Les & D.J. Crawford | duckmeat |
| Lemna L. | duckweed |
| Juncus dudleyi Wiegand | Dudley’s rush |
| Dulichium Pers. | dulichium |
| Smilax bona-nox L. var. littoralis Coker ex Sorrie | dunes saw greenbrier |
| Crocus vernus (L.) Hill | dutch crocus |
| Dicentra cucullaria (L.) Bernh. | dutchman’s breeches |
| Aristolochia L. | dutchman’s pipe |
| Rhododendron atlanticum (Ashe) Rehder | dwarf azalea |
| Quercus prinoides Willd. | dwarf chinquapin oak |
| Potentilla canadensis L. | dwarf cinquefoil |
| Digitaria serotina (Walter) Michx. | dwarf crabgrass |
| Iris cristata Aiton | dwarf crested iris |
| Gentianella Moench | dwarf gentian |
| Panax trifolius L. | dwarf ginseng |
| Celtis pumila Pursh | dwarf hackberry |
| Crataegus uniflora Münchh. | dwarf hawthorn |
| Lonicera xylosteum L. | dwarf honeysuckle |
| Gaylussacia dumosa (Andrews) Torr. & A. Gray | dwarf huckleberry |
| Delphinium tricorne Michx. | dwarf larkspur |
| Urtica urens L. | dwarf nettle |
| Plantago pusilla Nutt. | dwarf plantain |
| Salicornia bigelovii Torr. | dwarf saltwort |
| Chaenorhinum (DC.) Rchb. | dwarf snapdragon |
| Eleocharis parvula (Roem. & Schult.) Link ex Bluff, Nees & Schauer | dwarf spikerush |
| Hypericum mutilum L. | dwarf St. Johnswort |
| Drosera brevifolia Pursh | dwarf sundew |
| Fuirena pumila (Torr.) Spreng. | dwarf umbrella-sedge |
| Iris verna L. | dwarf violet iris |
| Trillium pusillum Michx. | dwarf wakerobin |
| Krigia Schreb. | dwarfdandelion |
| Genista tinctoria L. | Dyer’s greenweed |
| Isatis tinctoria L. | Dyer’s woad |
| Dysphania R. Br. | dysphania |
| Agalinis auriculata (Michx.) S.F. Blake | earleaf false foxglove |
| Rhododendron prinophyllum (Small) Millais | early azalea |
| Viola ×palmata L. (pro sp.) [brittoniana or pedatifida × affinis or sororia] | early blue violet |
| Poa cuspidata Nutt. | early bluegrass |
| Ranunculus fascicularis Muhl. ex Bigelow | early buttercup |
| Solidago juncea Aiton | early goldenrod |
| Thalictrum dioicum L. | early meadow-rue |
| Paspalum praecox Walter | early paspalum |
| Saxifraga virginiensis Michx. | early saxifrage |
| Hypericum nudiflorum Michx. ex Willd. | early St. Johnswort |
| Erigeron vernus (L.) Torr. & A. Gray | early whitetop fleabane |
| Elymus macgregorii R. Brooks & J.J.N. Campb. | early wildrye |
| Barbarea verna (Mill.) Asch. | early yellowrocket |
| Bromus latiglumis (Shear) Hitchc. | earlyleaf brome |
| Lysimachia terrestris (L.) Britton, Sterns & Poggenb. | earth loosestrife |
| Symphyotrichum subulatum (Michx.) G.L. Nesom | eastern annual saltmarsh aster |
| Baccharis halimifolia L. | eastern baccharis |
| Monarda bradburiana Beck | eastern beebalm |
| Sisyrinchium atlanticum E.P. Bicknell | eastern blue-eyed grass |
| Amsonia tabernaemontana Walter | eastern bluestar |
| Elymus hystrix L. | eastern bottlebrush grass |
| Populus deltoides W. Bartram ex Marshall | eastern cottonwood |
| Erigeron annuus (L.) Pers. | eastern daisy fleabane |
| Enemion biternatum Raf. | eastern false rue anemone |
| Stenanthium gramineum (Ker Gawl.) Morong | eastern featherbells |
| Tripsacum dactyloides (L.) L. | eastern gamagrass |
| Lilaeopsis chinensis (L.) Kuntze | eastern grasswort |
| Penstemon canescens (Britton) Britton | eastern gray beardtongue |
| Hybanthus concolor (T.F. Forst.) Spreng. | eastern greenviolet |
| Dennstaedtia punctilobula (Michx.) T. Moore | eastern hayscented fern |
| Tsuga canadensis (L.) Carrière | eastern hemlock |
| Conioselinum chinense (L.) Britton, Sterns & Poggenb. | eastern hemlockparsley |
| Dirca palustris L. | eastern leatherwood |
| Thelypteris palustris Schott | eastern marsh fern |
| Galactia regularis (L.) Britton, Sterns & Poggenb. | eastern milkpea |
| Carex amphibola Steud. | eastern narrowleaf sedge |
| Toxicodendron radicans (L.) Kuntze | eastern poison ivy |
| Ribes cynosbati L. | eastern prickly gooseberry |
| Utricularia purpurea Walter | eastern purple bladderwort |
| Echinacea purpurea (L.) Moench | eastern purple coneflower |
| Cercis canadensis L. | eastern redbud |
| Juniperus virginiana L. | eastern redcedar |
| Carex scabrata Schwein. | eastern rough sedge |
| Eurybia spectabilis (Aiton) G.L. Nesom | eastern showy aster |
| Symphyotrichum concolor (L.) G.L. Nesom | eastern silver aster |
| Penstemon laevigatus Aiton | eastern smooth beardtongue |
| Carex radiata (Wahlenb.) Small | eastern star sedge |
| Carex straminea Willd. ex Schkuhr | eastern straw sedge |
| Saxifraga pensylvanica L. | eastern swamp saxifrage |
| Calycanthus floridus L. | eastern sweetshrub |
| Gaultheria procumbens L. | eastern teaberry |
| Xerophyllum asphodeloides (L.) Nutt. | eastern turkeybeard |
| Euonymus atropurpureus Jacq. var. atropurpureus | eastern wahoo |
| Hydrophyllum virginianum L. | eastern waterleaf |
| Pinus strobus L. | eastern white pine |
| Carex blanda Dewey | eastern woodland sedge |
| Cheilanthes eatonii Baker | Eaton’s lipfern |
| Dichanthelium spretum (Schult.) Freckmann | Eaton’s rosette grass |
| Asplenium platyneuron (L.) Britton, Sterns & Poggenb. | ebony spleenwort |
| Echinocystis Torr. & A. Gray | echinocystis |
| Rubus defectionis Fernald | eclipse blackberry |
| Eclipta L. | eclipta |
| Ficus carica L. | edible fig |
| Vallisneria L. | eelgrass |
| Egeria Planch. | egeria |
| Dichanthelium ovale (Elliott) Gould & C.A. Clark | eggleaf rosette grass |
| Dactyloctenium aegyptium (L.) Willd. | Egyptian grass |
| Sambucus L. | elderberry |
| Inula helenium L. | elecampane inula |
| Elephantopus L. | elephantsfoot |
| Diamorpha smallii Britton ex Small | elf orpine |
| Agrostis elliottiana Schult. | Elliott’s bentgrass |
| Vaccinium elliottii Chapm. | Elliott’s blueberry |
| Andropogon gyrans Ashe | Elliott’s bluestem |
| Sida elliottii Torr. & A. Gray | Elliott’s fanpetals |
| Gentiana catesbaei Walter | Elliott’s gentian |
| Solidago latissimifolia Mill. | Elliott’s goldenrod |
| Juncus elliottii Chapm. | Elliott’s rush |
| Ellisia L. | ellisia |
| Ulmus L. | elm |
| Solidago ulmifolia Muhl. ex Willd. | elmleaf goldenrod |
| Carex albicans Willd. ex Spreng. var. emmonsii (Dewey ex Torr.) J. Rettig | Emmons’ sedge |
| Carex emoryi Dewey | Emory’s sedge |
| Circaea L. | enchanter’s nightshade |
| Sagittaria engelmanniana J.G. Sm. | Engelmann’s arrowhead |
| Crataegus engelmannii Sarg. | Engelmann’s hawthorn |
| Eleocharis engelmannii Steud. | Engelmann’s spikerush |
| Hyacinthoides non-scripta (L.) Chouard ex Rothm. | English bluebell |
| Ulmus procera Salisb. | English elm |
| Ilex aquifolium L. | English holly |
| Hedera helix L. | English ivy |
| Aureolaria laevigata (Raf.) Raf. | entireleaf yellow false foxglove |
| Stachys eplingii J.B. Nelson | Epling’s hedgenettle |
| Eranthis Salisb. | eranthis |
| Bromus erectus Huds. | erect brome |
| Centella erecta (L. f.) Fernald | erect centella |
| Torilis japonica (Houtt.) DC. | erect hedgeparsley |
| Polygonum erectum L. | erect knotweed |
| Opuntia stricta (Haw.) Haw. | erect pricklypear |
| Erigenia Nutt. | erigenia |
| Eryngium L. | eryngo |
| Eriocaulon parkeri B.L. Rob. | estuary pipewort |
| Myriophyllum spicatum L. | Eurasian watermilfoil |
| Salvia sclarea L. | Europe sage |
| Alnus glutinosa (L.) Gaertn. | European alder |
| Sambucus nigra L. ssp. nigra | European black elderberry |
| Sparganium emersum Rehmann | European bur-reed |
| Centaurium erythraea Rafn | European centaury |
| Cerastium pumilum W. Curtis | European chickweed |
| Phragmites australis (Cav.) Trin. ex Steud. ssp. australis | European common reed |
| Viburnum opulus L. | European cranberrybush |
| Viola arvensis Murray | European field pansy |
| Heliotropium europaeum L. | European heliotrope |
| Larix decidua Mill. | European larch |
| Convallaria majalis L. | European lily of the valley |
| Juncus inflexus L. | European meadow rush |
| Prunus domestica L. | European plum |
| Ligustrum vulgare L. | European privet |
| Cakile maritima Scop. | European searocket |
| Veronica beccabunga L. | European speedwell |
| Euonymus europaeus L. | European spindletree |
| Lappula squarrosa (Retz.) Dumort. | European stickseed |
| Lythrum virgatum L. | European wand loosestrife |
| Betula pendula Roth | European white birch |
| Penstemon australis Small | Eustis Lake beardtongue |
| Silene nivea (Nutt.) Muhl. ex Otth | evening campion |
| Oenothera L. | evening primrose |
| Gelsemium sempervirens (L.) W.T. Aiton | evening trumpetflower |
| Isoetes hyemalis D.F. Brunton | evergreen quillwort |
| Gamochaeta Weddell | everlasting |
| Chamaesyce nutans (Lag.) Small | eyebane |
| Prosartes D. Don | fairybells |
| Chamaelirium luteum (L.) A. Gray | fairywand |
| Falcaria Fabr. | falcaria |
| Leontodon autumnalis L. | fall dandelion |
| Panicum dichotomiflorum Michx. | fall panicgrass |
| Phlox paniculata L. | fall phlox |
| Digitaria cognata (Schult.) Pilg. | fall witchgrass |
| Manfreda virginica (L.) Salisb. ex Rose | false aloe |
| Triantha (Nutt.) Baker | false asphodel |
| Galium mollugo L. | false baby’s breath |
| Calystegia R. Br. | false bindweed |
| Brickellia eupatorioides (L.) Shinners | false boneset |
| Spermacoce L. | false buttonweed |
| Eclipta prostrata (L.) L. | false daisy |
| Hydrolea L. | false fiddleleaf |
| Camelina Crantz | false flax |
| Euphorbia pubentissima Michx. | false flowering spurge |
| Agalinis Raf. | false foxglove |
| Nothoscordum Kunth | false garlic |
| Astilbe Buch.-Ham. ex D. Don | false goat’s beard |
| Heterotheca Cass. | false goldenaster |
| Veratrum L. | false hellebore |
| Rubus geniculatus Kaltenb. | false Himalayan berry |
| Carex lupuliformis Sartwell ex Dewey | false hop sedge |
| Hasteola Raf. | false Indian plantain |
| Amorpha L. | false indigo |
| Amorpha fruticosa L. | false indigo bush |
| Berteroa DC. | false madwort |
| Malvastrum A. Gray | false mallow |
| Torreyochloa Church | false mannagrass |
| Schizachne Hack. | false melic |
| Floerkea proserpinacoides Willd. | false mermaidweed |
| Boehmeria Jacq. | false nettle |
| Hedeoma Pers. | false pennyroyal |
| Lindernia All. | false pimpernel |
| Rhus michauxii Sarg. | false poison sumac |
| Enemion Raf. | false rue anemone |
| Sorbaria (Ser. ex DC.) A. Braun | false spiraea |
| Deparia Hook. & Grev. | false spleenwort |
| Andrographis Wall. ex Nees | false waterwillow |
| Lycopodium digitatum Dill. ex A. Braun | fan clubmoss |
| Crataegus flabellata (Bosc ex Spach) K. Koch | fanleaf hawthorn |
| Sida L. | fanpetals |
| Cabomba Aubl. | fanwort |
| Vaccinium arboreum Marshall | farkleberry |
| Rhynchospora fascicularis (Michx.) Vahl | fascicled beaksedge |
| Fatoua Gaudich. | fatoua |
| Vicia faba L. | fava bean |
| Erythronium L. | fawnlily |
| Stenanthium (A. Gray) Kunth | featherbells |
| Rhynchospora oligantha A. Gray | featherbristle beaksedge |
| Dianthus plumarius L. | feathered pink |
| Maianthemum racemosum (L.) Link | feathery false lily of the valley |
| Foeniculum Mill. | fennel |
| Cyperus filicinus Vahl | fern flatsedge |
| Desmodium fernaldii B.G. Schub. | Fernald’s ticktrefoil |
| Rorippa palustris (L.) Besser ssp. fernaldiana (Butters & Abbe) Jonsell | Fernald’s yellowcress |
| Phacelia bipinnatifida Michx. | fernleaf phacelia |
| Aureolaria pedicularia (L.) Raf. | fernleaf yellow false foxglove |
| Quercus ×fernowii Trel. [alba × stellata] | Fernow oak |
| Festuca L. | fescue |
| Carex festucacea Schkuhr ex Willd. | fescue sedge |
| Pieris D. Don | fetterbush |
| Lyonia lucida (Lam.) K. Koch | fetterbush lyonia |
| Parthenium L. | feverfew |
| Triosteum perfoliatum L. | feverwort |
| Rhynchospora rariflora (Michx.) Elliott | fewflower beaksedge |
| Asclepias lanceolata Walter | fewflower milkweed |
| Scleria pauciflora Muhl. ex Willd. | fewflower nutrush |
| Desmodium pauciflorum (Nutt.) DC. | fewflower ticktrefoil |
| Helianthus occidentalis Riddell | fewleaf sunflower |
| Carex communis L.H. Bailey | fibrousroot sedge |
| Rumex pulcher L. | fiddle dock |
| Amsinckia Lehm. | fiddleneck |
| Convolvulus arvensis L. | field bindweed |
| Bromus arvensis L. | field brome |
| Soliva sessilis Ruiz & Pav. | field burrweed |
| Cerastium arvense L. | field chickweed |
| Trifolium campestre Schreb. | field clover |
| Myosotis arvensis (L.) Hill | field forget-me-not |
| Allium oleraceum L. | field garlic |
| Equisetum arvense L. | field horsetail |
| Brassica rapa L. | field mustard |
| Viola bicolor Pursh | field pansy |
| Paspalum laeve Michx. | field paspalum |
| Thlaspi arvense L. | field pennycress |
| Lepidium campestre (L.) W.T. Aiton | field pepperweed |
| Cucurbita pepo L. | field pumpkin |
| Antennaria neglecta Greene | field pussytoes |
| Artemisia campestris L. | field sagewort |
| Sonchus arvensis L. | field sowthistle |
| Cirsium discolor (Muhl. ex Willd.) Spreng. | field thistle |
| Ficus L. | fig |
| Ranunculus ficaria L. | fig buttercup |
| Scrophularia L. | figwort |
| Angelica triquinata Michx. | filmy angelica |
| Fimbristylis Vahl | fimbry |
| Festuca filiformis Pourr. | fineleaf sheep fescue |
| Cnidoscolus urens (L.) Arthur var. stimulosus (Michx.) Govaerts | finger rot |
| Abies Mill. | fir |
| Euphorbia cyathophora Murray | fire on the mountain |
| Silene virginica L. | fire pink |
| Crataegus chrysocarpa Ashe | fireberry hawthorn |
| Pyracantha M. Roem. | firethorn |
| Chamerion Raf. ex Holub | fireweed |
| Tephrosia purpurea (L.) Pers. | fishpoison |
| Fissidens Hedw. | fissidens moss |
| Cuscuta pentagona Engelm. | fiveangled dodder |
| Isotria Raf. | fiveleaf orchid |
| Cerastium semidecandrum L. | fivestamen chickweed |
| Rhododendron calendulaceum (Michx.) Torr. | flame azalea |
| Phemeranthus Raf. | flameflower |
| Lathyrus sylvestris L. | flat pea |
| Cyperus L. | flatsedge |
| Carex planispicata Naczi | flat-spiked sedge |
| Potamogeton zosteriformis Fernald | flatstem pondweed |
| Eleocharis compressa Sull. | flatstem spikerush |
| Danthonia compressa Austin | flattened oatgrass |
| Eriocaulon compressum Lam. | flattened pipewort |
| Euthamia graminifolia (L.) Nutt. | flat-top goldentop |
| Linum L. | flax |
| Agalinis linifolia (Nutt.) Britton | flaxleaf false foxglove |
| Anagallis monelli L. | flaxleaf pimpernel |
| Ionactis linariifolius (L.) Greene | flaxleaf whitetop aster |
| Erigeron L. | fleabane |
| Crataegus succulenta Schrad. ex Link | fleshy hawthorn |
| Glyceria septentrionalis Hitchc. | floating mannagrass |
| Hydrocotyle ranunculoides L. f. | floating marshpennywort |
| Ludwigia peploides (Kunth) P.H. Raven | floating primrose-willow |
| Nymphoides Hill | floatingheart |
| Floerkea Willd. | floerkea |
| Malaxis spicata Sw. | Florida adder’s-mouth orchid |
| Vitis cinerea (Engelm.) Engelm. ex Millard var. floridana Munson | Florida grape |
| Stachys floridana Shuttlw. ex Benth. | Florida hedgenettle |
| Wolffiella gladiata (Hegelm.) Hegelm. | Florida mudmidget |
| Paspalum floridanum Michx. | Florida paspalum |
| Carex floridana Schwein. | Florida sedge |
| Linum floridanum (Planch.) Trel. | Florida yellow flax |
| Hibiscus trionum L. | flower of an hour |
| Cornus florida L. | flowering dogwood |
| Pyxidanthera barbulata Michx. | flowering pixiemoss |
| Chaenomeles Lindl. | flowering quince |
| Euphorbia corollata L. | flowering spurge |
| Trichostema brachiatum L. | fluxweed |
| Amianthium muscitoxicum (Walter) A. Gray | flypoison |
| Tiarella L. | foamflower |
| Phyla Lour. | fogfruit |
| Chenopodium foggii Wahl | Fogg’s goosefoot |
| Dicliptera Juss. | foldwing |
| Myosotis L. | forget-me-not |
| Trichostema dichotomum L. | forked bluecurls |
| Silene dichotoma Ehrh. | forked catchfly |
| Fimbristylis dichotoma (L.) Vahl | forked fimbry |
| Juncus dichotomus Elliott | forked rush |
| Cardamine dissecta (Leavenworth) Al-Shehbaz | forkleaf toothwort |
| Forsythia Vahl | forsythia |
| Spiraea japonica L. f. var. fortunei (Planch.) Rehder | fortune meadowsweet |
| Pennisetum Rich. ex Pers. | fountaingrass |
| Mirabilis L. | four o’clock |
| Sabatia quadrangula Wilbur | fourangle rose gentian |
| Lysimachia quadriflora Sims | fourflower yellow loosestrife |
| Asclepias quadrifolia Jacq. | fourleaf milkweed |
| Dioscorea quaternata J.F. Gmel. | fourleaf yam |
| Poa palustris L. | fowl bluegrass |
| Glyceria striata (Lam.) Hitchc. | fowl mannagrass |
| Vitis labrusca L. | fox grape |
| Carex vulpinoidea Michx. | fox sedge |
| Penstemon digitalis Nutt. ex Sims | foxglove beardtongue |
| Alopecurus L. | foxtail |
| Amaranthus caudatus L. | foxtail amaranth |
| Hordeum jubatum L. | foxtail barley |
| Lycopodiella alopecuroides (L.) Cranfill | foxtail clubmoss |
| Setaria italica (L.) P. Beauv. | foxtail millet |
| Dalea leporina (Aiton) Bullock | foxtail prairie clover |
| Galium triflorum Michx. | fragrant bedstraw |
| Nothoscordum borbonicum Kunth | fragrant false garlic |
| Cyperus odoratus L. | fragrant flatsedge |
| Hosta plantaginea (Lam.) Asch. | fragrant plantain lily |
| Rhus aromatica Aiton | fragrant sumac |
| Carex frankii Kunth | Frank’s sedge |
| Abies fraseri (Pursh) Poir. | Fraser fir |
| Cymophyllus fraserianus (Ker Gawl.) Kartesz & Gandhi | Fraser’s cymophyllus |
| Triadenum fraseri (Spach) Gleason | Fraser’s marsh St. Johnswort |
| Tagetes patula L. | French marigold |
| Rosa gallica L. | French rose |
| Orbexilum onobrychis (Nutt.) Rydb. | French-grass |
| Polygonum cilinode Michx. | fringed black bindweed |
| Bromus ciliatus L. | fringed brome |
| Gentianopsis Ma | fringed gentian |
| Lysimachia ciliata L. | fringed loosestrife |
| Rhexia petiolata Walter | fringed meadowbeauty |
| Scleria ciliata Michx. | fringed nutrush |
| Platanthera Rich. | fringed orchid |
| Phacelia fimbriata Michx. | fringed phacelia |
| Carex crinita Lam. | fringed sedge |
| Epilobium ciliatum Raf. | fringed willowherb |
| Xyris fimbriata Elliott | fringed yelloweyed grass |
| Ruellia humilis Nutt. | fringeleaf wild petunia |
| Chionanthus L. | fringetree |
| Vitis vulpina L. | frost grape |
| Helianthemum Mill. | frostweed |
| Dipsacus fullonum L. | Fuller’s teasel |
| Corydalis DC. | fumewort |
| Fumaria L. | fumitory |
| Trillium sulcatum Patrick | furrowed wakerobin |
| Deutzia scabra Thunb. | fuzzy pride-of-Rochester |
| Carex hirsutella Mack. | fuzzy wuzzy sedge |
| Strophostyles Elliott | fuzzybean |
| Galax Sims | galax |
| Galearis Raf. | galearis |
| Prenanthes trifoliolata (Cass.) Fernald | gall of the earth |
| Galinsoga Ruiz & Pav. | gallant soldier |
| Tripsacum L. | gamagrass |
| Steinchisma Raf. | gaping grass |
| Asparagus officinalis L. | garden asparagus |
| Anthriscus cerefolium (L.) Hoffm. | garden chervil |
| Centaurea cyanus L. | garden cornflower |
| Cosmos bipinnatus Cav. | garden cosmos |
| Cucumis sativus L. | garden cucumber |
| Rubus aboriginum Rydb. | garden dewberry |
| Hyacinthus orientalis L. | garden hyacinth |
| Pisum sativum L. | garden pea |
| Rheum rhabarbarum L. | garden rhubarb |
| Antirrhinum majus L. | garden snapdragon |
| Hylotelephium erythrostictum (Miq.) H. Ohba | garden stonecrop |
| Solanum lycopersicum L. | garden tomato |
| Vicia sativa L. | garden vetch |
| Barbarea vulgaris W.T. Aiton | garden yellowrocket |
| Lepidium sativum L. | gardencress pepperweed |
| Alliaria petiolata (M. Bieb.) Cavara & Grande | garlic mustard |
| Panicum gattingeri Nash | Gattinger’s panicgrass |
| Polygala paucifolia Willd. | gaywings |
| Gentiana L. | gentian |
| Scirpus georgianus Harper | Georgia bulrush |
| Ilex longipes Chapm. ex Trel. | Georgia holly |
| Geranium L. | geranium |
| Matricaria recutita L. | German chamomile |
| Stachys germanica L. | German hedgenettle |
| Iris germanica L. | German iris |
| Scleranthus L. | German knotgrass |
| Teucrium L. | germander |
| Veronica chamaedrys L. | germander speedwell |
| Asperugo L. | German-madwort |
| Caulophyllum giganteum (Farw.) Loconte & Blackwell | giant blue cohosh |
| Setaria magna Griseb. | giant bristlegrass |
| Arundinaria gigantea (Walter) Muhl. | giant cane |
| Zizaniopsis miliacea (Michx.) Döll & Asch. | giant cutgrass |
| Solidago gigantea Aiton | giant goldenrod |
| Agastache Clayton ex Gronov. | giant hyssop |
| Vernonia gigantea (Walter) Trel. | giant ironweed |
| Polygonum sachalinense F. Schmidt ex Maxim. | giant knotweed |
| Arundo L. | giant reed |
| Carex gigantea Rudge | giant sedge |
| Helianthus giganteus L. | giant sunflower |
| Myosoton aquaticum (L.) Moench | giantchickweed |
| Mentha ×gracilis Sole (pro sp.) [arvensis × spicata] | gingermint |
| Ginkgo L. | ginkgo |
| Panax L. | ginseng |
| Diplazium pycnocarpon (Spreng.) Broun | glade fern |
| Lobelia glandulosa Walter | glade lobelia |
| Leavenworthia Torr. | gladecress |
| Napaea dioica L. | glademallow |
| Gladiolus L. | gladiolus |
| Glebionis Cass. | glebionis |
| Glechoma L. | glechoma |
| Gomphrena L. | globe amaranth |
| Rhynchospora globularis (Chapm.) Small | globe beaksedge |
| Cyperus echinatus (L.) Alph. Wood | globe flatsedge |
| Ludwigia sphaerocarpa Elliott | globefruit primrose-willow |
| Echinops L. | globethistle |
| Carex aggregata Mack. | glomerate sedge |
| Salix caprea L. | goat willow |
| Aegilops L. | goatgrass |
| Tragopogon L. | goatsbeard |
| Eupatorium godfreyanum Cronquist | Godfrey’s thoroughwort |
| Phyllostachys aurea Carrière ex A. Rivière & C. Rivière | golden bamboo |
| Anthemis tinctoria L. | golden chamomile |
| Trifolium aureum Pollich | golden clover |
| Aletris aurea Walter | golden colicroot |
| Saxifraga careyana A. Gray | golden eye saxifrage |
| Gratiola aurea Pursh | golden hedgehyssop |
| Packera aurea (L.) Á. Löve & D. Löve | golden ragwort |
| Chrysosplenium L. | golden saxifrage |
| Coreopsis tinctoria Nutt. | golden tickseed |
| Zizia aurea (L.) W.D.J. Koch | golden zizia |
| Chrysopsis (Nutt.) Elliott | goldenaster |
| Thermopsis R. Br. | goldenbanner |
| Orontium L. | goldenclub |
| Carex aureolensis Steud. | goldenfruit sedge |
| Hudsonia L. | goldenheather |
| Koelreuteria paniculata Laxm. | goldenrain tree |
| Oligoneuron Small | goldenrod |
| Hydrastis canadensis L. | goldenseal |
| Euthamia Nutt. ex Cass. | goldentop |
| Dryopteris goldieana (Hook. ex Goldie) A. Gray | Goldie’s woodfern |
| Sedum acre L. | goldmoss stonecrop |
| Camelina sativa (L.) Crantz ssp. sativa | gold-of-pleasure |
| Coptis Salisb. | goldthread |
| Plantago maritima L. | goose tongue |
| Chenopodium L. | goosefoot |
| Eleusine Gaertn. | goosegrass |
| Lesquerella gordonii (A. Gray) S. Watson | Gordon’s bladderpod |
| Solidago faucibus Wieboldt | gorge goldenrod |
| Ulex L. | gorse |
| Cucurbita L. | gourd |
| Aegopodium L. | goutweed |
| Carex gracillima Schwein. | graceful sedge |
| Sorghum bicolor (L.) Moench ssp. bicolor | grain sorghum |
| Bouteloua Lag. | grama |
| Cyperus granitophilus McVaugh | granite flatsedge |
| Vitis L. | grape |
| Muscari Mill. | grape hyacinth |
| Botrychium Sw. | grapefern |
| Parnassia L. | grass of Parnassus |
| Heteranthera dubia (Jacq.) MacMill. | grassleaf mudplantain |
| Callisia graminea (Small) G. Tucker | grassleaf roseling |
| Juncus marginatus Rostk. | grassleaf rush |
| Stellaria graminea L. | grass-like starwort |
| Calopogon R. Br. | grasspink |
| Lilaeopsis Greene | grasswort |
| Sagittaria graminea Michx. | grassy arrowhead |
| Rubus allegheniensis Porter var. gravesii Fernald | Graves’ blackberry |
| Alnus incana (L.) Moench | gray alder |
| Betula populifolia Marshall | gray birch |
| Cerastium brachypetalum Pers. | gray chickweed |
| Cornus racemosa Lam. | gray dogwood |
| Gamochaeta coarctata (Willd.) Kerguélen | gray everlasting |
| Veronica polita Fr. | gray field speedwell |
| Solidago nemoralis Aiton | gray goldenrod |
| Populus ×canescens (Aiton) Sm. (pro sp.) [alba × tremula] | gray poplar |
| Vitis cinerea (Engelm.) Engelm. ex Millard | graybark grape |
| Baptisia cinerea (Raf.) Fernald & B.G. Schub. | grayhairy wild indigo |
| Rubus idaeus L. ssp. strigosus (Michx.) Focke | grayleaf red raspberry |
| Rhynchospora grayi Kunth | Gray’s beaksedge |
| Cyperus grayi Torr. | Gray’s flatsedge |
| Lilium grayi S. Watson | Gray’s lily |
| Carex grayi Carey | Gray’s sedge |
| Lobelia siphilitica L. | great blue lobelia |
| Echinops sphaerocephalus L. | great globethistle |
| Arnoglossum reniforme (Hook.) H. Rob. | great Indian plantain |
| Rhododendron maximum L. | great laurel |
| Cyperus lupulinus (Spreng.) Marcks | Great Plains flatsedge |
| Spiranthes magnicamporum Sheviak | Great Plains lady’s tresses |
| Ambrosia trifida L. | great ragweed |
| Oxalis grandis Small | great yellow woodsorrel |
| Carex intumescens Rudge | greater bladder sedge |
| Gentianopsis crinita (Froel.) Ma | greater fringed gentian |
| Triadenum walteri (J.G. Gmel.) Gleason | greater marsh St. Johnswort |
| Platanthera grandiflora (Bigelow) Lindl. | greater purple fringed orchid |
| Carex normalis Mack. | greater straw sedge |
| Coreopsis major Walter | greater tickseed |
| Cypripedium parviflorum Salisb. var. pubescens (Willd.) Knight | greater yellow lady’s slipper |
| Anemone blanda Schott & Kotschy | Greek thimbleweed |
| Polemonium reptans L. | Greek valerian |
| Malaxis unifolia Michx. | green adder’s-mouth orchid |
| Chrysogonum virginianum L. | green and gold |
| Peltandra virginica (L.) Schott | green arrow arum |
| Fraxinus pennsylvanica Marshall | green ash |
| Setaria viridis (L.) P. Beauv. | green bristlegrass |
| Scirpus atrovirens Willd. | green bulrush |
| Mollugo verticillata L. | green carpetweed |
| Asclepias viridiflora Raf. | green comet milkweed |
| Arisaema dracontium (L.) Schott | green dragon |
| Veratrum viride Aiton | green false hellebore |
| Veronica agrestis L. | green field speedwell |
| Platanthera lacera (Michx.) G. Don | green fringed orchid |
| Frasera Walter | green gentian |
| Crataegus viridis L. | green hawthorn |
| Helleborus viridis L. | green hellebore |
| Smilax L. | greenbrier |
| Pyrola chlorantha Sw. | greenflowered wintergreen |
| Minuartia groenlandica (Retz.) Ostenf. | Greenland stitchwort |
| Forsythia viridissima Lindl. | greenstem forsythia |
| Spiranthes praecox (Walter) S. Watson | greenvein lady’s tresses |
| Hybanthus Jacq. | greenviolet |
| Carex albolutescens Schwein. | greenwhite sedge |
| Grewia L. | grewia |
| Rubus grimesii L.H. Bailey | Grimes’ dewberry |
| Grimmia Hedw. | grimmia dry rock moss |
| Linum sulcatum Riddell | grooved flax |
| Glechoma hederacea L. | ground ivy |
| Physalis L. | groundcherry |
| Apios Fabr. | groundnut |
| Poa alsodes A. Gray | grove bluegrass |
| Crataegus lucorum Sarg. | grove hawthorn |
| Melothria pendula L. | Guadeloupe cucumber |
| Guizotia Cass. | guizotia |
| Grindelia Willd. | gumweed |
| Synandra hispidula (Michx.) Britton | Guyandotte beauty |
| Cynoglossum officinale L. | gypsyflower |
| Lycopus europaeus L. | gypsywort |
| Celtis L. | hackberry |
| Muhlenbergia capillaris (Lam.) Trin. | hairawn muhly |
| Aira L. | hairgrass |
| Bulbostylis Kunth | hairsedge |
| Heuchera villosa Michx. | hairy alumroot |
| Angelica venenosa (Greenway) Fernald | hairy angelica |
| Penstemon hirsutus (L.) Willd. | hairy beardtongue |
| Galium pilosum Aiton | hairy bedstraw |
| Cardamine hirsuta L. | hairy bittercress |
| Ranunculus sardous Crantz | hairy buttercup |
| Hypochaeris radicata L. | hairy cat’s ear |
| Jacquemontia tamnifolia (L.) Griseb. | hairy clustervine |
| Digitaria sanguinalis (L.) Scop. | hairy crabgrass |
| Fatoua villosa (Thunb.) Nakai | hairy crabweed |
| Eriochloa villosa (Thunb.) Kunth | hairy cupgrass |
| Oenothera villosa Thunb. | hairy evening primrose |
| Fimbristylis puberula (Michx.) Vahl | hairy fimbry |
| Paronychia fastigiata (Raf.) Fernald | hairy forked nailwort |
| Solidago hispida Muhl. ex Willd. | hairy goldenrod |
| Stachys pilosa Nutt. | hairy hedgenettle |
| Smallanthus uvedalius (L.) Mack. ex Small | hairy leafcup |
| Lespedeza hirta (L.) Hornem. | hairy lespedeza |
| Lactuca hirsuta Muhl. ex Nutt. | hairy lettuce |
| Cheilanthes lanosa (Michx.) D.C. Eaton | hairy lipfern |
| Blephilia hirsuta (Pursh) Benth. | hairy pagoda-plant |
| Lechea mucronata Raf. | hairy pinweed |
| Ludwigia pilosa Walter | hairy primrose-willow |
| Veronica peregrina L. ssp. xalapensis (Kunth) Pennell | hairy purslane speedwell |
| Arabis hirsuta (L.) Scop. | hairy rockcress |
| Carex lacustris Willd. | hairy sedge |
| Ponthieva racemosa (Walter) C. Mohr | hairy shadow witch |
| Scutellaria elliptica Muhl. ex Spreng. | hairy skullcap |
| Desmodium ciliare (Muhl. ex Willd.) DC. | hairy small-leaf ticktrefoil |
| Bassia hirsuta (L.) Asch. | hairy smotherweed |
| Polygonatum pubescens (Willd.) Pursh | hairy Solomon’s seal |
| Hypericum setosum L. | hairy St. Johnswort |
| Helianthus hirsutus Raf. | hairy sunflower |
| Fuirena squarrosa Michx. | hairy umbrella-sedge |
| Symphyotrichum pilosum (Willd.) G.L. Nesom | hairy white oldfield aster |
| Elymus villosus Muhl. ex Willd. | hairy wildrye |
| Bromus pubescens Muhl. ex Willd. | hairy woodland brome |
| Luzula acuminata Raf. | hairy woodrush |
| Chaerophyllum tainturieri Hook. | hairyfruit chervil |
| Carex trichocarpa Muhl. ex Willd. | hairyfruit sedge |
| Thaspium barbinode (Michx.) Nutt. | hairyjoint meadowparsnip |
| Vigna luteola (Jacq.) Benth. | hairypod cowpea |
| Paspalum pubiflorum Rupr. ex Fourn. | hairyseed paspalum |
| Ribes hirtellum Michx. | hairystem gooseberry |
| Hibiscus laevis All. | halberdleaf rosemallow |
| Polygonum arifolium L. | halberdleaf tearthumb |
| Viola hastata Michx. | halberdleaf yellow violet |
| Lipocarpha R. Br. | halfchaff sedge |
| Carex hirta L. | hammer sedge |
| Rhexia virginica L. | handsome Harry |
| Carex pendula Huds. | hanging sedge |
| Erigenia bulbosa (Michx.) Nutt. | harbinger of spring |
| Festuca brevipila Tracey | hard fescue |
| Sclerochloa P. Beauv. | hardgrass |
| Schoenoplectus acutus (Muhl. ex Bigelow) Á. Löve & D. Löve | hardstem bulrush |
| Poncirus trifoliata (L.) Raf. | hardy orange |
| Hordeum murinum L. ssp. leporinum (Link) Arcang. | hare barley |
| Bupleurum rotundifolium L. | hare’s ear |
| Conringia Heist. ex Fabr. | hare’s ear mustard |
| Solidago canadensis L. var. hargeri Fernald | Harger’s goldenrod |
| Iris versicolor L. | harlequin blueflag |
| Fimbristylis perpusilla Harper ex Small & Britton | Harper’s fimbry |
| Carex leptalea Wahlenb. ssp. harperi (Fernald) W. Stone | Harper’s sedge |
| Solidago arguta Aiton var. harrisii (Steele) Cronquist | Harris’ goldenrod |
| Gentiana saponaria L. | harvestbells |
| Agrimonia parviflora Aiton | harvestlice |
| Rhynchospora harveyi W. Boott | Harvey’s beaksedge |
| Cyperus haspan L. | haspan flatsedge |
| Leontodon L. | hawkbit |
| Crepis L. | hawksbeard |
| Hieracium L. | hawkweed |
| Picris hieracioides L. | hawkweed oxtongue |
| Crataegus L. | hawthorn |
| Carex argyrantha Tuck. | hay sedge |
| Dennstaedtia Bernh. | hayscented fern |
| Alnus serrulata (Aiton) Willd. | hazel alder |
| Cuscuta coryli Engelm. | hazel dodder |
| Corylus L. | hazelnut |
| Hexastylis Raf. | heartleaf |
| Tiarella cordifolia L. | heartleaf foamflower |
| Mirabilis nyctaginea (Michx.) MacMill. | heartleaf four o’clock |
| Stachys cordata Riddell | heartleaf hedgenettle |
| Ampelopsis cordata Michx. | heartleaf peppervine |
| Plantago cordata Lam. | heartleaf plantain |
| Scutellaria ovata Hill | heartleaf skullcap |
| Listera cordata (L.) R. Br. | heartleaf twayblade |
| Rumex hastatulus Baldw. | heartwing sorrel |
| Carex gravida L.H. Bailey | heavy sedge |
| Calystegia sepium (L.) R. Br. | hedge false bindweed |
| Luzula echinata (Small) F.J. Herm. | hedgehog woodrush |
| Gratiola L. | hedgehyssop |
| Sisymbrium L. | hedgemustard |
| Stachys L. | hedgenettle |
| Torilis Adans. | hedgeparsley |
| Heliopsis Pers. | heliopsis |
| Heliotropium L. | heliotrope |
| Helleborus L. | hellebore |
| Epipactis Zinn | helleborine |
| Lotus unifoliolatus (Hook.) Benth. var. helleri (Britton) Kartesz & Gandhi | Heller’s bird’s-foot trefoil |
| Pseudognaphalium helleri (Britton) Anderb. | Heller’s cudweed |
| Dichanthelium oligosanthes (Schult.) Gould | Heller’s rosette grass |
| Orobanche minor Sm. | hellroot |
| Scutellaria integrifolia L. | helmet flower |
| Helonias L. | helonias |
| Tsuga Carrière | hemlock |
| Dichanthelium sabulorum (Lam.) Gould & C.A. Clark | hemlock rosette grass |
| Sium suave Walter | hemlock waterparsnip |
| Conioselinum Hoffm. | hemlockparsley |
| Cannabis L. | hemp |
| Eupatorium cannabinum L. | hemp agrimony |
| Orobanche ramosa L. | hemp broomrape |
| Galeopsis L. | hempnettle |
| Mikania Willd. | hempvine |
| Lamium amplexicaule L. | henbit deadnettle |
| Phlox nivalis Lodd. ex Sweet ssp. hentzii (Nutt.) Wherry | Hentz’s phlox |
| Hepatica Mill. | hepatica |
| Bacopa monnieri (L.) Pennell | herb of grace |
| Verbena officinalis L. | herb of the cross |
| Descurainia sophia (L.) Webb ex Prantl | herb sophia |
| Suaeda maritima (L.) Dumort. | herbaceous seepweed |
| Ptilimnium capillaceum (Michx.) Raf. | herbwilliam |
| Zanthoxylum clava-herculis L. | Hercules’ club |
| Utricularia geminiscapa Benj. | hiddenfruit bladderwort |
| Malva sylvestris L. | high mallow |
| Rubus ostryifolius Rydb. | highbush blackberry |
| Vaccinium corymbosum L. | highbush blueberry |
| Leucothoe fontanesiana (Steud.) Sleumer | highland doghobble |
| Juncus trifidus L. | highland rush |
| Potamogeton hillii Morong | Hill’s pondweed |
| Rubus bifrons Vest ex Tratt. | Himalayan berry |
| Rubus armeniacus Focke | Himalayan blackberry |
| Carex complanata Torr. & Hook. | hirsute sedge |
| Hyacinthoides hispanica (Mill.) Rothm. | Hispanic hyacinthoides |
| Malvastrum hispidum (Pursh) Hochr. | hispid false mallow |
| Acanthospermum hispidum DC. | hispid starbur |
| Rorippa palustris (L.) Besser ssp. hispida (Desv.) Jonsell | hispid yellowcress |
| Carex hitchcockiana Dewey | Hitchcock’s sedge |
| Berteroa incana (L.) DC. | hoary alyssum |
| Helianthemum bicknellii Fernald | hoary frostweed |
| Philadelphus pubescens Loisel. | hoary mock orange |
| Pycnanthemum incanum (L.) Michx. | hoary mountainmint |
| Lithospermum canescens (Michx.) Lehm. | hoary puccoon |
| Scutellaria incana Biehler | hoary skullcap |
| Desmodium canescens (L.) DC. | hoary ticktrefoil |
| Tephrosia Pers. | hoarypea |
| Viburnum lantanoides Michx. | hobblebush |
| Solanum physalifolium Rusby | hoe nightshade |
| Amphicarpaea Elliott ex Nutt. | hogpeanut |
| Croton capitatus Michx. | hogwort |
| Ilex L. | holly |
| Polystichum Roth | hollyfern |
| Alcea L. | hollyhock |
| Holosteum L. | holosteum |
| Honckenya Ehrh. | honckenya |
| Cryptotaenia DC. | honewort |
| Zenobia D. Don | honeycup |
| Gleditsia triacanthos L. | honeylocust |
| Lonicera L. | honeysuckle |
| Cynanchum laeve (Michx.) Pers. | honeyvine |
| Leonurus sibiricus L. | honeyweed |
| Sagittaria calycina Engelm. | hooded arrowhead |
| Setaria verticillata (L.) P. Beauv. | hooked bristlegrass |
| Humulus L. | hop |
| Carex lupulina Muhl. ex Willd. | hop sedge |
| Ostrya Scop. | hophornbeam |
| Ptelea L. | hoptree |
| Marrubium L. | horehound |
| Carpinus L. | hornbeam |
| Utricularia cornuta Michx. | horned bladderwort |
| Zannichellia L. | horned pondweed |
| Podostemum ceratophyllum Michx. | hornleaf riverweed |
| Mitreola L. | hornpod |
| Glaucium Mill. | hornpoppy |
| Anthoxanthum L. | hornwort |
| Aesculus hippocastanum L. | horse chestnut |
| Collinsonia L. | horsebalm |
| Baptisia tinctoria (L.) R. Br. | horseflyweed |
| Triosteum L. | horse-gentian |
| Equisetum L. | horsetail |
| Paspalum fluitans (Elliott) Kunth | horsetail paspalum |
| Conyza Less. | horseweed |
| Prunus hortulana L.H. Bailey | hortulan plum |
| Hottonia L. | hottonia |
| Cyperus houghtonii Torr. | Houghton’s flatsedge |
| Cynoglossum L. | hound’s tongue |
| Sempervivum L. | houseleek |
| Hovenia Thunb. | hovenia |
| Antennaria howellii Greene | Howell’s pussytoes |
| Gaylussacia Kunth | huckleberry |
| Utricularia gibba L. | humped bladderwort |
| Physalis pubescens L. | husk tomato |
| Hyacinthus L. | hyacinth |
| Lablab purpureus (L.) Sweet | hyacinthbean |
| Hyacinthoides Medik. | hyacinthoides |
| Typha ×glauca Godr. (pro sp.) [angustifolia or domingensis × latifolia] | hybrid cattail |
| Salix ×rubens Schrank (pro sp.) [alba × fragilis] | hybrid crack willow |
| Rumex ×acutus L. (pro sp.) [crispus × obtusifolius] | hybrid dock |
| Carya Nutt. | hybrid hickory |
| Quercus ×bebbiana C.K. Schneid. [alba × macrocarpa] | hybrid oak |
| Polypodium ×incognitum Cusick [appalachianum × virginianum] | Hybrid rock polypody |
| Rhus ×borealis Greene [glabra × typhina] | hybrid sumac |
| Viola ×bissellii House [cucullata × sororia] | hybrid violet |
| Juglans ×intermedia Carrière [nigra × regia] | hybrid walnut |
| Salix ×bebbii Gandog. [eriocephala × sericea] | hybrid willow |
| Hydrangea L. | hydrangea |
| Hydrastis L. | hydrastis |
| Hydrilla Rich. | hydrilla |
| Hydrocotyle L. | hydrocotyle |
| Hyophila Brid. | hyophila moss |
| Stachys aspera Michx. | hyssopleaf hedgenettle |
| Eupatorium hyssopifolium L. | hyssopleaf thoroughwort |
| Desmanthus illinoensis (Michx.) MacMill. ex B.L. Rob. & Fernald | Illinois bundleflower |
| Lechea racemulosa Michx. | Illinois pinweed |
| Potamogeton illinoensis Morong | Illinois pondweed |
| Gaillardia pulchella Foug. | Indian blanket |
| Pediomelum Rydb. | Indian breadroot |
| Medeola L. | Indian cucumber |
| Eleusine indica (L.) Gaertn. | Indian goosegrass |
| Heliotropium indicum L. | Indian heliotrope |
| Aeschynomene indica L. | Indian jointvetch |
| Eragrostis pilosa (L.) P. Beauv. | Indian lovegrass |
| Abutilon Mill. | Indian mallow |
| Castilleja Mutis ex L. f. | Indian paintbrush |
| Arnoglossum Raf. | Indian plantain |
| Canna indica L. | Indian shot |
| Duchesnea indica (Andrews) Teschem. | Indian strawberry |
| Hygrophila polysperma (Roxb.) T. Anderson | Indian swampweed |
| Dipsacus sativus (L.) Honck. | Indian teasel |
| Chasmanthium latifolium (Michx.) Yates | Indian woodoats |
| Sorghastrum Nash | Indiangrass |
| Apocynum cannabinum L. | Indianhemp |
| Gillenia Moench | Indian-physic |
| Monotropa L. | Indianpipe |
| Lobelia inflata L. | Indian-tobacco |
| Carex grisea Wahlenb. | inflated narrow-leaf sedge |
| Ilex glabra (L.) A. Gray | inkberry |
| Muhlenbergia glabriflora Scribn. | inland muhly |
| Juncus interior Wiegand | inland rush |
| Carex interior L.H. Bailey | inland sedge |
| Proserpinaca intermedia Mack. | intermediate mermaidweed |
| Dryopteris intermedia (Muhl. ex Willd.) A. Gray | intermediate woodfern |
| Osmunda claytoniana L. | interrupted fern |
| Salvia pratensis L. | introduced sage |
| Lycopodiella inundata (L.) Holub | inundated clubmoss |
| Ipomopsis Michx. | ipomopsis |
| Iris L. | iris |
| Solanum tuberosum L. | Irish potato |
| Xyris laxifolia Mart. var. iridifolia (Chapm.) Kral | irisleaf yelloweyed grass |
| Vernonia Schreb. | ironweed |
| Arum italicum Mill. | Italian lords and ladies |
| Lolium perenne L. ssp. multiflorum (Lam.) Husnot | Italian ryegrass |
| Hedera L. | ivy |
| Ranunculus hederaceus L. | ivy buttercup |
| Ipomoea hederacea Jacq. | ivyleaf morning-glory |
| Veronica hederifolia L. | ivyleaf speedwell |
| Arisaema Mart. | Jack in the pulpit |
| Tragopogon pratensis L. | Jack-go-to-bed-at-noon |
| Polemonium L. | Jacob’s-ladder |
| Holosteum umbellatum L. | jagged chickweed |
| Cladium mariscus (L.) Pohl ssp. jamaicense (Crantz) Kük. | Jamaica swamp sawgrass |
| Rubus rosarius L.H. Bailey | James River blackberry |
| Carex jamesii Schwein. | James’ sedge |
| Berberis thunbergii DC. | Japanese barberry |
| Pinus thunbergii Parl. | Japanese black pine |
| Setaria faberi Herrm. | Japanese bristlegrass |
| Kummerowia striata (Thunb.) Schindl. | Japanese clover |
| Calystegia hederacea Wall. | Japanese false bindweed |
| Malus floribunda Siebold ex Van Houtte | Japanese flowering crab apple |
| Lonicera japonica Thunb. | Japanese honeysuckle |
| Humulus japonicus Siebold & Zucc. | Japanese hop |
| Polygonum cuspidatum Siebold & Zucc. | Japanese knotweed |
| Mazus pumilus (Burm. f.) Steenis | Japanese mazus |
| Spiraea japonica L. f. | Japanese meadowsweet |
| Cyrtomium falcatum (L. f.) C. Presl | Japanese netvein hollyfern |
| Pachysandra terminalis Siebold & Zucc. | Japanese pachysandra |
| Styphnolobium japonicum (L.) Schott | Japanese pagoda tree |
| Ligustrum japonicum Thunb. | Japanese privet |
| Hovenia dulcis Thunb. | Japanese raisintree |
| Kerria japonica (L.) DC. | Japanese rose |
| Carex kobomugi Ohwi | Japanese sedge |
| Euonymus japonicus Thunb. | Japanese spindletree |
| Spiraea ×bumalda Burven [albiflora × japonica] | Japanese spiraea |
| Wisteria floribunda (Willd.) DC. | Japanese wisteria |
| Senna obtusifolia (L.) Irwin & Barneby | Java-bean |
| Jeffersonia W. Bartram | jeffersonia |
| Sedum reflexum L. | Jenny’s stonecrop |
| Ceanothus herbaceus Raf. | Jersey tea |
| Helianthus tuberosus L. | Jerusalem artichoke |
| Dysphania botrys (L.) Mosyakin & Clemants | Jerusalem oak goosefoot |
| Iva frutescens L. | Jesuit’s bark |
| Rhodotypos scandens (Thunb.) Makino | jetbead |
| Impatiens capensis Meerb. | jewelweed |
| Datura L. | jimsonweed |
| Commelina benghalensis L. | jio |
| Eutrochium Raf. | joe pye weed |
| Viola tricolor L. | johnny jumpup |
| Sorghum halepense (L.) Pers. | Johnsongrass |
| Aegilops cylindrica Host | jointed goatgrass |
| Eleocharis equisetoides (Elliott) Torr. | jointed spikesedge |
| Juncus articulatus L. | jointleaf rush |
| Coelorachis Brongn. | jointtail grass |
| Aeschynomene L. | jointvetch |
| Polygonella Michx. | jointweed |
| Alternanthera Forssk. | joyweed |
| Iresine rhizomatosa Standl. | Juda’s bush |
| Polygonum virginianum L. | jumpseed |
| Echinochloa colona (L.) Link | jungle rice |
| Juniperus L. | juniper |
| Polypremum procumbens L. | juniper leaf |
| Carex juniperorum Catling, Reznicek & Crins | juniper sedge |
| Eupatorium leucolepis (DC.) Torr. & A. Gray | justiceweed |
| Themeda Forssk. | kangaroo grass |
| Salvinia molesta Mitchell | kariba-weed |
| Trifolium virginicum Small ex Small & Vail | Kates Mountain clover |
| Robinia hispida L. var. kelseyi (J.F. Cowell ex Hutch.) Isely | Kelsey’s locust |
| Cymbalaria muralis G. Gaertn., B. Mey. & Scherb. | Kenilworth ivy |
| Poa pratensis L. | Kentucky bluegrass |
| Gymnocladus dioicus (L.) K. Koch | Kentucky coffeetree |
| Cypripedium kentuckiense C.F. Reed | Kentucky lady’s slipper |
| Cladrastis kentukea (Dum. Cours.) Rudd | Kentucky yellowwood |
| Kerria DC. | kerria |
| Dactylorhiza Neck. ex Nevski | keyflower |
| Alternanthera pungens Kunth | khakiweed |
| Phaseolus vulgaris L. | kidney bean |
| Parnassia asarifolia Vent. | kidneyleaf grass of Parnassus |
| Heteranthera reniformis Ruiz & Pav. | kidneyleaf mudplantain |
| Silphium compositum Michx. | kidneyleaf rosinweed |
| Listera smallii Wiegand | kidneyleaf twayblade |
| Carex reniformis (L.H. Bailey) Small | kidneyshape sedge |
| Thalictrum pubescens Pursh | king of the meadow |
| Rubus multifer L.H. Bailey | kinnickinnick dewberry |
| Arctostaphylos uva-ursi (L.) Spreng. | kinnikinnick |
| Polygonum orientale L. | kiss me over the garden gate |
| Salvia officinalis L. | kitchen sage |
| Rubus bellobatus L.H. Bailey | Kittatinny blackberry |
| Centaurea L. | knapweed |
| Consolida Gray | knight’s-spur |
| Paspalum distichum L. | knotgrass |
| Trifolium striatum L. | knotted clover |
| Juncus nodosus L. | knotted rush |
| Polygonum L. | knotweed |
| Koelreuteria Laxm. | koelreuteria |
| Kummerowia stipulacea (Maxim.) Makino | Korean clover |
| Zoysia japonica Steud. | Korean lawngrass |
| Kosteletzkya C. Presl | kosteletzkya |
| Carex kraliana Naczi & Bryson | Kral’s sedge |
| Selaginella kraussiana (Kunze) A. Braun | Krauss’ spikemoss |
| Pueraria DC. | kudzu |
| Kummerowia Schindl. | kummerowia |
| Lablab Adans. | lablab |
| Eragrostis capillaris (L.) Nees | lace grass |
| Spiranthes laciniata (Small) Ames | lacelip lady’s tresses |
| Stephanandra incisa (Thunb.) Zabel | laceshrub |
| Lachnanthes Elliott | lachnanthes |
| Athyrium Roth | ladyfern |
| Cypripedium L. | lady’s slipper |
| Spiranthes Rich. | lady’s tresses |
| Lagenaria Ser. | lagenaria |
| Lagerstroemia L. | lagerstroemia |
| Isoetes lacustris L. | lake quillwort |
| Neobeckia Greene | lakecress |
| Galium divaricatum Pourr. ex Lam. | Lamarck’s bedstraw |
| Chenopodium album L. | lambsquarters |
| Lamiastrum Heist. ex Fabr. | lamiastrum |
| Juncus effusus L. var. solutus Fernald & Wiegand | lamp rush |
| Asplenium ruta-muraria L. var. lanceolum Christ | lance asplenium |
| Prunella vulgaris L. ssp. lanceolata (W. Bartram) Hultén | lance selfheal |
| Rhamnus lanceolata Pursh | lanceleaf buckthorn |
| Scrophularia lanceolata Pursh | lanceleaf figwort |
| Phyla lanceolata (Michx.) Greene | lanceleaf fogfruit |
| Solidago lancifolia Torr. & A. Gray | lance-leaf goldenrod |
| Botrychium lanceolatum (S.G. Gmel.) Angstr. | lanceleaf grapefern |
| Smilax smallii Morong | lanceleaf greenbrier |
| Lysimachia lanceolata Walter | lanceleaf loosestrife |
| Ambrosia bidentata Michx. | lanceleaf ragweed |
| Sabatia difformis (L.) Druce | lanceleaf rose gentian |
| Salvia reflexa Hornem. | lanceleaf sage |
| Coreopsis lanceolata L. | lanceleaf tickseed |
| Desmodium ciliare (Muhl. ex Willd.) DC. var. lancifolium Fernald & B.G. Schub. | lanceleaf ticktrefoil |
| Galium lanceolatum Torr. | lanceleaf wild licorice |
| Phlox divaricata L. ssp. laphamii (Alph. Wood) Wherry | Lapham’s phlox |
| Laportea Gaudich. | laportea |
| Larix Mill. | larch |
| Ilex coriacea (Pursh) Chapm. | large gallberry |
| Salix cinerea L. | large gray willow |
| Petunia axillaris (Lam.) Britton, Sterns & Poggenb. | large white petunia |
| Isotria verticillata Raf. | large whorled pogonia |
| Vicia grandiflora Scop. | large yellow vetch |
| Desmodium cuspidatum (Muhl. ex Willd.) DC. ex D. Don | largebract ticktrefoil |
| Plantago aristata Michx. | largebracted plantain |
| Symphyotrichum grandiflorum (L.) G.L. Nesom | largeflower aster |
| Uvularia grandiflora Sm. | largeflower bellwort |
| Hexastylis shuttleworthii (Britten & Baker f.) Small | largeflower heartleaf |
| Ludwigia grandiflora (Michx.) Greuter & Burdet | large-flower primrose-willow |
| Coreopsis grandiflora Hogg ex Sweet | largeflower tickseed |
| Valeriana pauciflora Michx. | largeflower valerian |
| Amaranthus deflexus L. | largefruit amaranth |
| Sanicula trifoliata E.P. Bicknell | largefruit blacksnakeroot |
| Parnassia grandifolia DC. | largeleaf grass of Parnassus |
| Hydrocotyle bonariensis Comm. ex Lam. | largeleaf pennywort |
| Phlox amplifolia Britton | largeleaf phlox |
| Potamogeton amplifolius Tuck. | largeleaf pondweed |
| Hydrophyllum macrophyllum Nutt. | largeleaf waterleaf |
| Lechea intermedia Leggett ex Britton | largepod pinweed |
| Myosotis macrosperma Engelm. | largeseed forget-me-not |
| Delphinium L. | larkspur |
| Coreopsis delphiniifolia Lam. | larkspurleaf tickseed |
| Symphyotrichum patens (Aiton) G.L. Nesom | late purple aster |
| Eupatorium serotinum Michx. | lateflowering thoroughwort |
| Kalmia L. | laurel |
| Smilax laurifolia L. | laurel greenbrier |
| Quercus laurifolia Michx. | laurel oak |
| Salix pentandra L. | laurel willow |
| Limonium carolinianum (Walter) Britton | lavender thrift |
| Hydrocotyle sibthorpioides Lam. | lawn marshpennywort |
| Bellis perennis L. | lawndaisy |
| Zoysia Willd. | lawngrass |
| Mitreola petiolata (J.F. Gmel.) Torr. & A. Gray | lax hornpod |
| Xyris laxifolia Mart. | laxleaf yelloweyed grass |
| Polymnia L. | leafcup |
| Phyllanthus L. | leafflower |
| Scirpus polyphyllus Vahl | leafy bulrush |
| Lespedeza cyrtobotrya Miq. | leafy lespedeza |
| Potamogeton foliosus Raf. | leafy pondweed |
| Euphorbia esula L. | leafy spurge |
| Clematis L. | leather flower |
| Orbexilum Raf. | leather-root |
| Dirca L. | leatherwood |
| Botrychium multifidum (S.G. Gmel.) Trevis. | leathery grapefern |
| Juncus coriaceus Mack. | leathery rush |
| Carex leavenworthii Dewey | Leavenworth’s sedge |
| Nestronia umbellula Raf. | leechbrush |
| Lechea pulchella Raf. | Leggett’s pinweed |
| Thymus pulegioides L. | lemon thyme |
| Heterotheca camporum (Greene) Shinners | lemonyellow false goldenaster |
| Vicia tetrasperma (L.) Schreb. | lentil vetch |
| Scutellaria parvula Michx. var. missouriensis (Torr.) Goodman & C.A. Lawson | Leonard’s skullcap |
| Lespedeza Michx. | lespedeza |
| Arctium minus Bernh. | lesser burdock |
| Calamintha nepeta (L.) Savi | lesser calamint |
| Hypericum canadense L. | lesser Canadian St. Johnswort |
| Pilea fontana (Lunell) Rydb. | lesser clearweed |
| Juncus repens Michx. | lesser creeping rush |
| Lemna aequinoctialis Welw. | lesser duckweed |
| Leontodon taraxacoides (Vill.) Mérat | lesser hawkbit |
| Centaurea nigra L. | lesser knapweed |
| Triadenum tubulosum (Walter) Gleason | lesser marsh St. Johnswort |
| Platanthera psycodes (L.) Lindl. | lesser purple fringed orchid |
| Goodyera repens (L.) R. Br. | lesser rattlesnake plantain |
| Platanthera orbiculata (Pursh) Lindl. | lesser roundleaved orchid |
| Ageratina aromatica (L.) Spach | lesser snakeroot |
| Coronopus didymus (L.) Sm. | lesser swinecress |
| Cypripedium parviflorum Salisb. | lesser yellow lady’s slipper |
| Lactuca L. | lettuce |
| Saxifraga micranthidifolia (Haw.) Steud. | lettuceleaf saxifrage |
| Leucospora Nutt. | leucospora |
| Hexastylis lewisii (Fernald) Blomquist & Oosting | Lewis’ heartleaf |
| Valerianella locusta (L.) Lat. | Lewiston cornsalad |
| Glycyrrhiza L. | licorice |
| Galium circaezans Michx. | licorice bedstraw |
| Ligusticum L. | licorice-root |
| Syringa L. | lilac |
| Vitex agnus-castus L. | lilac chastetree |
| Lilium L. | lily |
| Salpichroa origanifolia (Lam.) Thell. | lily of the valley vine |
| Liriope Lour. | lilyturf |
| Lonicera dioica L. | limber honeysuckle |
| Ophioglossum engelmannii Prantl | limestone adderstongue |
| Cardamine douglassii Britton | limestone bittercress |
| Clinopodium arkansanum (Nutt.) House | limestone calamint |
| Carex granularis Muhl. ex Willd. | limestone meadow sedge |
| Ruellia strepens L. | limestone wild petunia |
| Glyceria laxa (Scribn.) Scribn. | limp mannagrass |
| Viburnum dilatatum Thunb. | linden arrowwood |
| Dichanthelium acuminatum (Sw.) Gould & C.A. Clark var. lindheimeri (Nash) Gould & C.A. Clark | Lindheimer panicgrass |
| Misopates orontium (L.) Raf. | linearleaf snapdragon |
| Carex striatula Michx. | lined sedge |
| Chaiturus Willd. | lion’s tail |
| Physostegia Benth. | lionsheart |
| Cheilanthes Sw. | lipfern |
| Litsea Lam. | litsea |
| Hordeum pusillum Nutt. | little barley |
| Schizachyrium Nees | little bluestem |
| Medicago minima (L.) L. | little bur-clover |
| Lemna obscura (Austin) Daubs | little duckweed |
| Oenothera perennis L. | little evening primrose |
| Utricularia radiata Small | little floating bladderwort |
| Botrychium simplex E. Hitchc. | little grapefern |
| Hexastylis minor (Ashe) Blomquist | little heartleaf |
| Portulaca oleracea L. | little hogweed |
| Spiranthes tuberosa Raf. | little lady’s tresses |
| Eragrostis minor Host | little lovegrass |
| Briza minor L. | little quakinggrass |
| Trillium cuneatum Raf. | little sweet Betsy |
| Hexastylis arifolia (Michx.) Small | littlebrownjug |
| Heuchera parviflora Bartlett | littleflower alumroot |
| Scleria oligantha Michx. | littlehead nutrush |
| Crataegus spathulata Michx. | littlehip hawthorn |
| Ranunculus abortivus L. | littleleaf buttercup |
| Polygala brevifolia Nutt. | littleleaf milkwort |
| Mimosa microphylla Dryand. | littleleaf sensitive-briar |
| Camelina microcarpa Andrz. ex DC. | littlepod false flax |
| Quercus virginiana Mill. | live oak |
| Saururus cernuus L. | lizard’s tail |
| Asplenium pinnatifidum Nutt. | lobed spleenwort |
| Coreopsis auriculata L. | lobed tickseed |
| Lobelia L. | lobelia |
| Pinus taeda L. | loblolly pine |
| Lobularia Desv. | lobularia |
| Gleditsia L. | locust |
| Dryopteris celsa (Wm. Palmer) Knowlt., Palmer & Pollard ex Small | log fern |
| Populus nigra L. | Lombardy poplar |
| Ludwigia brevipes (B.H. Long ex Britton, A. Braun & Small) Eames | Long Beach primrose-willow |
| Papaver argemone L. | long pricklyhead poppy |
| Sagittaria australis (J.G. Sm.) Small | longbeak arrowhead |
| Rhynchospora scirpoides (Torr.) A. Gray | longbeak beaksedge |
| Ranunculus longirostris Godr. | longbeak buttercup |
| Dactylorhiza viridis (L.) R.M. Bateman, A.M. Pridgeon & M.W. Chase | longbract frog orchid |
| Carex extensa Goodenough | longbract sedge |
| Helianthemum canadense (L.) Michx. | longbranch frostweed |
| Heuchera longiflora Rydb. | longflower alumroot |
| Carex comosa Boott | longhair sedge |
| Physalis longifolia Nutt. | longleaf groundcherry |
| Lobelia elongata Small | longleaf lobelia |
| Asclepias longifolia Michx. | longleaf milkweed |
| Pinus palustris Mill. | longleaf pine |
| Potamogeton nodosus Poir. | longleaf pondweed |
| Stellaria longifolia Muhl. ex Willd. | longleaf starwort |
| Houstonia longifolia Gaertn. | longleaf summer bluet |
| Aristida palustris (Chapm.) Vasey | longleaf threeawn |
| Sphenopholis filiformis (Chapm.) Scribn. | longleaf wedgescale |
| Chasmanthium sessiliflorum (Poir.) Yates | longleaf woodoats |
| Polygonum amphibium L. var. emersum Michx. | longroot smartweed |
| Cardamine longii Fernald | Long’s bittercress |
| Rubus longii Fernald | Long’s blackberry |
| Juncus longii Fernald | Long’s rush |
| Carex longii Mack. | Long’s sedge |
| Penstemon calycosus Small | longsepal beardtongue |
| Tridens strictus (Nutt.) Nash | longspike tridens |
| Viola rostrata Pursh | longspur violet |
| Geranium columbinum L. | longstalk cranesbill |
| Ilex collina Alexander | longstalk holly |
| Carex pedunculata Muhl. ex Willd. | longstalk sedge |
| Ophioglossum petiolatum Hook. | longstem adderstongue |
| Osmorhiza longistylis (Torr.) DC. | longstyle sweetroot |
| Pycnanthemum loomisii Nutt. | Loomis’ mountainmint |
| Justicia ovata (Walter) Lindau | looseflower water-willow |
| Rhynchospora chalarocephala Fernald & Gale | loosehead beaksedge |
| Lythrum L. | loosestrife |
| Juncus secundus P. Beauv. ex Poir. | lopsided rush |
| Nelumbo Adans. | lotus |
| Orobanche ludoviciana Nutt. | Louisiana broomrape |
| Carex louisianica L.H. Bailey | Louisiana sedge |
| Pedicularis L. | lousewort |
| Eragrostis von Wolf | lovegrass |
| Calystegia spithamaea (L.) Pursh | low false bindweed |
| Helianthemum propinquum E.P. Bicknell | low frostweed |
| Malva pusilla Sm. | low mallow |
| Neotorularia humilis (C.A. Mey.) Hedge & J. Léonard | low northern-rockcress |
| Scleria verticillata Muhl. ex Willd. | low nutrush |
| Polygala ramosa Elliott | low pinebarren milkwort |
| Eurybia radula (Aiton) G.L. Nesom | low rough aster |
| Ranunculus pusillus Poir. | low spearwort |
| Sphagnum compactum DC. | low sphagnum |
| Kyllinga pumila Michx. | low spikesedge |
| Myriophyllum humile (Raf.) Morong | low watermilfoil |
| Vaccinium angustifolium Aiton | lowbush blueberry |
| Cystopteris protrusa (Weath.) Blasdell | lowland bladderfern |
| Rotala ramosior (L.) Koehne | lowland rotala |
| Lysimachia hybrida Michx. | lowland yellow loosestrife |
| Symphyotrichum lowrieanum (Porter) G.L. Nesom | Lowrie’s blue wood aster |
| Rubus roribaccus (L.H. Bailey) Rydb. | Lucretia dewberry |
| Luffa Mill. | luffa |
| Lunaria L. | lunaria |
| Lupinus L. | lupine |
| Arabis lyrata L. | lyrate rockcress |
| Salvia lyrata L. | lyreleaf sage |
| Rosa bracteata J.C. Wendl. | Macartney rose |
| Macleaya R. Br. | macleaya |
| Maclura Nutt. | maclura |
| Pseudognaphalium macounii (Greene) Kartesz | Macoun’s cudweed |
| Calystegia macounii (Greene) Brummitt | Macoun’s false bindweed |
| Calamagrostis canadensis (Michx.) P. Beauv. var. macouniana (Vasey) Stebbins | Macoun’s reedgrass |
| Euphorbia helioscopia L. | madwoman’s milk |
| Alyssum L. | madwort |
| Magnolia L. | magnolia |
| Prunus mahaleb L. | Mahaleb cherry |
| Rhexia nashii Small | maid Marian |
| Thalictrum coriaceum (Britton) Small | maid of the mist |
| Thelypteris Schmidel | maiden fern |
| Dianthus deltoides L. | maiden pink |
| Amphicarpum Kunth | maidencane |
| Adiantum L. | maidenhair fern |
| Asplenium trichomanes L. | maidenhair spleenwort |
| Ginkgo biloba L. | maidenhair tree |
| Silene vulgaris (Moench) Garcke | maidenstears |
| Leptochloa fusca (L.) Kunth | Malabar sprangletop |
| Lyonia ligustrina (L.) DC. | maleberry |
| Malva L. | mallow |
| Ipomoea pandurata (L.) G. Mey. | man of the earth |
| Carex manhartii Bryson | Manhart’s sedge |
| Glyceria R. Br. | mannagrass |
| Rubus floricomus Blanch. | manyflower blackberry |
| Cyperus lancastriensis Porter ex A. Gray | manyflower flatsedge |
| Hydrocotyle umbellata L. | manyflower marshpennywort |
| Ludwigia polycarpa Short & Peter | manyfruit primrose-willow |
| Cyperus polystachyos Rottb. | manyspike flatsedge |
| Arctostaphylos Adans. | manzanita |
| Acer L. | maple |
| Chenopodium simplex (Torr.) Raf. | mapleleaf goosefoot |
| Viburnum acerifolium L. | mapleleaf viburnum |
| Onosmodium Michx. | marbleseed |
| Crataegus margarettiae Ashe | Margarett’s hawthorn |
| Dryopteris marginalis (L.) A. Gray | marginal woodfern |
| Tagetes L. | marigold |
| Cannabis sativa L. | marijuana |
| Matelea carolinensis (Jacq.) Woodson | maroon Carolina milkvine |
| Symphyotrichum elliottii (Torr. & A. Gray) G.L. Nesom | Marsh American-Aster |
| Campanula aparinoides Pursh | marsh bellflower |
| Viola cucullata Aiton | marsh blue violet |
| Setaria parviflora (Poir.) Kerguélen | marsh bristlegrass |
| Gnaphalium uliginosum L. | marsh cudweed |
| Iva L. | marsh elder |
| Fimbristylis castanea (Michx.) Vahl | marsh fimbry |
| Cyperus pseudovegetus Steud. | marsh flatsedge |
| Spiranthes odorata (Nutt.) Lindl. | marsh lady’s tresses |
| Caltha L. | marsh marigold |
| Proserpinaca palustris L. | marsh mermaidweed |
| Muhlenbergia racemosa (Michx.) Britton, Sterns & Poggenb. | marsh muhly |
| Cyclospermum Lag. | marsh parsley |
| Lathyrus palustris L. | marsh pea |
| Sabatia dodecandra (L.) Britton, Sterns & Poggenb. | marsh rose gentian |
| Ludwigia palustris (L.) Elliott | marsh seedbox |
| Scutellaria galericulata L. | marsh skullcap |
| Triadenum Raf. | marsh St. Johnswort |
| Carex hormathodes Fernald | marsh straw sedge |
| Althaea L. | marshmallow |
| Polygonum hydropiper L. | marshpepper knotweed |
| Mirabilis jalapa L. | marvel of Peru |
| Chrysopsis mariana (L.) Elliott | Maryland goldenaster |
| Hieracium greenii Porter & Britton | Maryland hawkweed |
| Rhexia mariana L. | Maryland meadowbeauty |
| Polygala mariana Mill. | Maryland milkwort |
| Sanicula marilandica L. | Maryland sanicle |
| Senna marilandica (L.) Link | Maryland senna |
| Amaranthus blitoides S. Watson | mat amaranth |
| Cenchrus longispinus (Hack.) Fernald | mat sandbur |
| Botrychium matricariifolium (A. Braun ex Dowell) A. Braun ex W.D.J. Koch | matricary grapefern |
| Lycium barbarum L. | matrimony vine |
| Isoetes mattaponica L.J. Musselman | Mattaponi quillwort |
| Eleocharis intermedia Schult. | matted spikerush |
| Dichanthelium meridionale (Ashe) Freckmann | matting rosette grass |
| Helianthus maximiliani Schrad. | Maximilian sunflower |
| Crataegus aestivalis (Walter) Torr. & A. Gray | may hawthorn |
| Mayaca Aubl. | mayaca |
| Podophyllum L. | mayapple |
| Maianthemum F.H. Wigg. | mayflower |
| Matricaria L. | mayweed |
| Mazus Lour. | mazus |
| Zizia trifoliata (Michx.) Fernald | meadow alexanders |
| Oenothera pilosella Raf. | meadow evening primrose |
| Schedonorus pratensis (Huds.) P. Beauv. | meadow fescue |
| Alopecurus pratensis L. | meadow foxtail |
| Allium canadense L. | meadow garlic |
| Hieracium caespitosum Dumort. | meadow hawkweed |
| Lathyrus pratensis L. | meadow pea |
| Selaginella apoda (L.) Spring | meadow spikemoss |
| Zizia aptera (A. Gray) Fernald | meadow zizia |
| Rhexia L. | meadowbeauty |
| Thaspium Nutt. | meadowparsnip |
| Thalictrum L. | meadow-rue |
| Carex meadii Dewey | Mead’s sedge |
| Mecardonia Ruiz & Pav. | mecardonia |
| Meehania Britton | meehania |
| Meehania cordata (Nutt.) Britton | Meehan’s mint |
| Melia L. | melia |
| Glyceria melicaria (Michx.) F.T. Hubbard | melic mannagrass |
| Melica L. | melicgrass |
| Cucumis L. | melon |
| Melothria L. | melothria |
| Rosa wichuraiana Crép. | memorial rose |
| Phemeranthus mengesii (W. Wolf) Kiger | Menges’ fameflower |
| Amsinckia menziesii (Lehm.) A. Nelson & J.F. Macbr. | Menzies’ fiddleneck |
| Menziesia Sm. | menziesia |
| Euphorbia mercurialina Michx. | mercury spurge |
| Proserpinaca L. | mermaidweed |
| Richardia L. | Mexican clover |
| Physalis philadelphica Lam. | Mexican groundcherry |
| Muhlenbergia mexicana (L.) Trin. | Mexican muhly |
| Argemone mexicana L. | Mexican pricklypoppy |
| Leptochloa fusca (L.) Kunth ssp. uninervia (J. Presl) N. Snow | Mexican sprangletop |
| Dysphania ambrosioides (L.) Mosyakin & Clemants | Mexican tea |
| Phacelia purshii Buckley | Miami mist |
| Croton michauxii G.L. Webster | Michaux’s croton |
| Leavenworthia uniflora (Michx.) Britton | Michaux’s gladecress |
| Saxifraga michauxii Britton | Michaux’s saxifrage |
| Minuartia michauxii (Fenzl) Farw. | Michaux’s stitchwort |
| Rubus michiganensis (Card ex L.H. Bailey) L.H. Bailey | Michigan dewberry |
| Carex mesochorea Mack. | midland sedge |
| Galactia P. Br. | milkpea |
| Silybum Adans. | milkthistle |
| Astragalus L. | milkvetch |
| Matelea Aubl. | milkvine |
| Asclepias L. | milkweed |
| Glaux L. | milkwort |
| Clematis viticaulis Steele | Millboro leather flower |
| Rhynchospora miliacea (Lam.) A. Gray | millet beaksedge |
| Milium L. | milletgrass |
| Montia L. | minerslettuce |
| Menziesia pilosa (Michx. ex Lam.) Juss. ex Pers. | minniebush |
| Mentha L. | mint |
| Lemna perpusilla Torr. | minute duckweed |
| Misopates Raf. | misopates |
| Crataegus vailiae Britton | Miss Vail’s hawthorn |
| Ranunculus laxicaulis (Torr. & A. Gray) Darby | Mississippi buttercup |
| Rubus vigilis L.H. Bailey | Missouri blackberry |
| Rubus missouricus L.H. Bailey | Missouri dewberry |
| Ribes missouriense Nutt. | Missouri gooseberry |
| Cucurbita foetidissima Kunth | Missouri gourd |
| Chenopodium album L. var. missouriense (Aellen) I.J. Bassett & C.W. Crompton | Missouri lambsquarters |
| Salix eriocephala Michx. | Missouri River willow |
| Phoradendron Nutt. | mistletoe |
| Mitchella L. | mitchella |
| Carex mitchelliana M.A. Curtis | Mitchell’s sedge |
| Mitella L. | miterwort |
| Cypripedium acaule Aiton | moccasin flower |
| Ptilimnium Raf. | mock bishopweed |
| Philadelphus L. | mock orange |
| Glandularia J.F. Gmel. | mock vervain |
| Carya tomentosa (Lam.) Nutt. | mockernut hickory |
| Andropogon mohrii (Hack.) Hack. ex Vasey | Mohr’s bluestem |
| Eupatorium mohrii Greene | Mohr’s thoroughwort |
| Sonchus arvensis L. ssp. uliginosus (M. Bieb.) Nyman | moist sowthistle |
| Euphorbia lathyris L. | moleplant |
| Alysicarpus Neck. ex Desv. | moneywort |
| Mimulus L. | monkeyflower |
| Aconitum L. | monkshood |
| Menispermum L. | moonseed |
| Moricandia DC. | moricandia |
| Ipomoea L. | morning-glory |
| Linaria maroccana Hook. f. | Moroccan toadflax |
| Lonicera morrowii A. Gray | Morrow’s honeysuckle |
| Scirpus hattorianus Makino | mosquito bulrush |
| Azolla Lam. | mosquitofern |
| Phlox subulata L. | moss phlox |
| Verbascum blattaria L. | moth mullein |
| Leonurus L. | motherwort |
| Sorbus L. | mountain ash |
| Eurybia chlorolepis (Burgess) G.L. Nesom | mountain aster |
| Uvularia puberula Michx. | mountain bellwort |
| Actaea podocarpa DC. | mountain bugbane |
| Stewartia ovata (Cav.) Weath. | mountain camellia |
| Zigadenus elegans Pursh | mountain deathcamas |
| Solidago curtisii Torr. & A. Gray | mountain decumbent goldenrod |
| Boltonia montana J.F. Towns. & Kar.-Castro | Mountain Doll’s Daisy |
| Pieris floribunda (Pursh) Benth. & Hook. f. | mountain fetterbush |
| Solidago flaccidifolia Small | mountain goldenrod |
| Ilex montana Torr. & A. Gray ex A. Gray | mountain holly |
| Kalmia latifolia L. | mountain laurel |
| Magnolia fraseri Walter | mountain magnolia |
| Acer spicatum Lam. | mountain maple |
| Thalictrum clavatum DC. | mountain meadow-rue |
| Paronychia montana (Small) Pax & K. Hoffm. | mountain nailwort |
| Betula papyrifera Marshall var. cordifolia (Regel) Fernald | mountain paper birch |
| Taenidia montana (Mack.) Cronquist | mountain pimpernel |
| Juncus arcticus Willd. ssp. littoralis (Engelm.) Hultén | mountain rush |
| Halesia tetraptera Ellis | mountain silverbell |
| Asplenium montanum Willd. | mountain spleenwort |
| Clethra acuminata Michx. | mountain sweetpepperbush |
| Anemone lancifolia Pursh | mountain thimbleweed |
| Dryopteris campyloptera Clarkson | mountain woodfern |
| Oxalis montana Raf. | mountain woodsorrel |
| Pycnanthemum Michx. | mountainmint |
| Hordeum murinum L. | mouse barley |
| Cerastium L. | mouse-ear chickweed |
| Arabidopsis thaliana (L.) Heynh. | mouseear cress |
| Hieracium pilosella L. | mouseear hawkweed |
| Myosurus L. | mousetail |
| Solidago simplex Kunth | Mt. Albert goldenrod |
| Rubus clarus L.H. Bailey | Mt. Vernon dewberry |
| Leptochloa panicea (Retz.) Ohwi ssp. brachiata (Steud.) N. Snow | mucronate sprangeltop |
| Leptochloa panicea (Retz.) Ohwi | mucronate sprangletop |
| Echinodorus tenellus (Mart. ex Schult. f.) Buchenau | mudbabies |
| Paspalum dissectum (L.) L. | mudbank crowngrass |
| Micranthemum Michx. | mudflower |
| Heteranthera Ruiz & Pav. | mudplantain |
| Limosella L. | mudwort |
| Scleria muehlenbergii Steud. | Muehlenberg’s nutrush |
| Carex muehlenbergii Schkuhr ex Willd. | Muhlenberg’s sedge |
| Muhlenbergia Schreb. | muhly |
| Morus L. | mulberry |
| Verbascum L. | mullein |
| Dasistoma macrophylla (Nutt.) Raf. | mullein foxglove |
| Rosa multiflora Thunb. | multiflora rose |
| Vigna radiata (L.) R. Wilczek | mung bean |
| Murdannia Royle | murdannia |
| Vitis rotundifolia Michx. | muscadine |
| Malva moschata L. | musk mallow |
| Mimulus moschatus Douglas ex Lindl. | muskflower |
| Brassica L. | mustard |
| Tagetes minuta L. | muster John Henry |
| Myosoton Moench | myosoton |
| Paronychia Mill. | nailwort |
| Desmodium nudiflorum (L.) DC. | nakedflower ticktrefoil |
| Nandina Thunb. | nandina |
| Viburnum lentago L. | nannyberry |
| Napaea L. | napaea |
| Saccharum baldwinii Spreng. | narrow plumegrass |
| Rhynchospora inundata (Oakes) Fernald | narrowfruit horned beaksedge |
| Cardamine impatiens L. | narrowleaf bittercress |
| Trichostema setaceum Houtt. | narrowleaf bluecurls |
| Sisyrinchium angustifolium Mill. | narrowleaf blue-eyed grass |
| Sparganium angustifolium Michx. | narrowleaf bur-reed |
| Typha angustifolia L. | narrowleaf cattail |
| Melampyrum lineare Desr. | narrowleaf cowwheat |
| Oenothera fruticosa L. | narrowleaf evening primrose |
| Gentiana linearis Froel. | narrowleaf gentian |
| Grindelia lanceolata Nutt. | narrowleaf gumweed |
| Lespedeza angustifolia (Pursh) Elliott | narrowleaf lespedeza |
| Montia linearis (Douglas ex Hook.) Greene | narrowleaf minerslettuce |
| Pycnanthemum tenuifolium Schrad. | narrowleaf mountainmint |
| Leucospora multifida (Michx.) Nutt. | narrowleaf paleseed |
| Lechea tenuifolia Michx. | narrowleaf pinweed |
| Plantago lanceolata L. | narrowleaf plantain |
| Potamogeton strictifolius Benn. | narrowleaf pondweed |
| Ludwigia linearis Walter | narrowleaf primrose-willow |
| Gamochaeta falcata (Lam.) Cabrera | narrowleaf purple everlasting |
| Sabatia brachiata Elliott | narrowleaf rose gentian |
| Pityopsis graminifolia (Michx.) Nutt. | narrowleaf silkgrass |
| Bupleurum odontites L. | narrowleaf thorow wax |
| Lotus tenuis Waldst. & Kit. ex Willd. | narrowleaf trefoil |
| Verbena simplex Lehm. | narrowleaf vervain |
| Alisma gramineum Lej. | narrowleaf water plantain |
| Sericocarpus linifolius (L.) Britton, Sterns & Poggenb. | narrowleaf whitetop aster |
| Allium burdickii (Hanes) A.G. Jones | narrowleaf wild leek |
| Juncus brevicaudatus (Engelm.) Fernald | narrowpanicle rush |
| Sisyrinchium nashii E.P. Bicknell | Nash’s blue-eyed grass |
| Tropaeolum L. | nasturtium |
| Valerianella umbilicata (Sull.) Alph. Wood | navel cornsalad |
| Carex projecta Mack. | necklace sedge |
| Carex ormostachya Wiegand | necklace spike sedge |
| Styphnolobium Schott | necklacepod |
| Veronica peregrina L. | neckweed |
| Rhynchospora capillacea Torr. | needle beaksedge |
| Sisyrinchium capillare E.P. Bicknell | needle blue-eyed grass |
| Eleocharis acicularis (L.) Roem. & Schult. | needle spikerush |
| Juncus roemerianus Scheele | needlegrass rush |
| Dichanthelium aciculare (Desv. ex Poir.) Gould & C.A. Clark | needleleaf rosette grass |
| Juncus scirpoides Lam. | needlepod rush |
| Sisyrinchium mucronatum Michx. | needletip blue-eyed grass |
| Microstegium vimineum (Trin.) A. Camus | Nepalese browntop |
| Carex leptonervia (Fernald) Fernald | nerveless woodland sedge |
| Tetragonotheca L. | nerveray |
| Nestronia Raf. | nestronia |
| Woodwardia areolata (L.) T. Moore | netted chainfern |
| Scleria reticularis Michx. | netted nutrush |
| Urtica L. | nettle |
| Chenopodium murale L. | nettleleaf goosefoot |
| Tragia urticifolia Michx. | nettleleaf noseburn |
| Salvia urticifolia L. | nettleleaf sage |
| Cyrtomium C. Presl | netvein hollyfern |
| Symphyotrichum novae-angliae (L.) G.L. Nesom | New England aster |
| Bolboschoenus novae-angliae (Britton) S.G. Sm. | New England bulrush |
| Vaccinium caesariense Mack. | New Jersey blueberry |
| Juncus caesariensis Coville | New Jersey rush |
| Ceanothus americanus L. | New Jersey tea |
| Symphyotrichum novi-belgii (L.) G.L. Nesom | New York aster |
| Thelypteris noveboracensis (L.) Nieuwl. | New York fern |
| Vernonia noveboracensis (L.) Michx. | New York ironweed |
| Nicandra Adans. | nicandra |
| Nigella L. | nigella |
| Anemone quinquefolia L. var. minima (DC.) Frodin | nightcaps |
| Silene noctiflora L. | nightflowering silene |
| Solanum L. | nightshade |
| Muhlenbergia schreberi J.F. Gmel. | nimblewill |
| Physocarpus (Camb.) Raf. | ninebark |
| Lapsana L. | nipplewort |
| Hypericum drummondii (Grev. & Hook.) Torr. & A. Gray | nits and lice |
| Rhynchospora inexpansa (Michx.) Vahl | nodding beaksedge |
| Bidens cernua L. | nodding beggartick |
| Cerastium nutans Raf. | nodding chickweed |
| Oenothera nutans Atk. & Bartlett | nodding evening primrose |
| Festuca subverticillata (Pers.) Alexeev | nodding fescue |
| Spiranthes cernua (L.) Rich. | nodding lady’s tresses |
| Muhlenbergia bushii Pohl | nodding muhly |
| Allium cernuum Roth | nodding onion |
| Carduus nutans L. | nodding plumeless thistle |
| Carex gynandra Schwein. | nodding sedge |
| Trillium flexipes Raf. | nodding wakerobin |
| Najas flexilis (Willd.) Rostk. & Schmidt | nodding waternymph |
| Triphora Nutt. | noddingcaps |
| Narcissus ×incomparabilis Mill. (pro sp.) [poeticus × pseudonarcissus] | nonesuch daffodil |
| Ophioglossum pusillum Raf. | northern adderstongue |
| Morella pensylvanica (Mirb.) Kartesz | northern bayberry |
| Galium boreale L. | northern bedstraw |
| Agrostis mertensii Trin. | northern bentgrass |
| Burmannia biflora L. | northern bluethread |
| Lycopus uniflorus Michx. | northern bugleweed |
| Diervilla lonicera Mill. | northern bush honeysuckle |
| Catalpa speciosa (Warder) Warder ex Engelm. | northern catalpa |
| Viola brittoniana Pollard | northern coastal violet |
| Rubus flagellaris Willd. | northern dewberry |
| Oenothera parviflora L. | northern evening primrose |
| Carex folliculata L. | northern long sedge |
| Adiantum pedatum L. | northern maidenhair |
| Spiraea septentrionalis (Fernald) Á. Löve & D. Löve | northern meadowsweet |
| Dichanthelium boreale (Nash) Freckmann | northern panicgrass |
| Sarracenia purpurea L. ssp. purpurea var. purpurea | northern purple pitcherplant |
| Quercus rubra L. | northern red oak |
| Neotorularia Hedge & J. Léonard | northern rockcress |
| Selaginella rupestris (L.) Spring | northern selaginella |
| Brachyelytrum aristosum (Michx.) Trel. | northern shorthusk |
| Spiranthes lacera (Raf.) Raf. | northern slender lady’s tresses |
| Lindera benzoin (L.) Blume | northern spicebush |
| Hypericum boreale (Britton) E.P. Bicknell | northern St. Johnswort |
| Hierochloe hirta (Schrank) Borbás | northern sweetgrass |
| Wolffia borealis (Engelm. ex Hegelm.) Landolt ex Landolt & Wildi | northern watermeal |
| Viola septentrionalis Greene | northern woodland violet |
| Carex utriculata Boott | Northwest Territory sedge |
| Acer platanoides L. | Norway maple |
| Picea abies (L.) Karst. | Norway spruce |
| Potentilla norvegica L. | Norwegian cinquefoil |
| Tragia L. | noseburn |
| Bromus nottowayanus Fernald | Nottoway Valley brome |
| Cyperus rotundus L. | nutgrass |
| Scleria P.J. Bergius | nutrush |
| Lobelia nuttallii Schult. | Nuttall’s lobelia |
| Polygala nuttallii Torr. & A. Gray | Nuttall’s milkwort |
| Micranthemum micranthemoides (Nutt.) Wettst. | Nuttall’s mudflower |
| Calamagrostis coarctata Eaton | Nuttall’s reedgrass |
| Cirsium nuttallii DC. | Nuttall’s thistle |
| Desmodium nuttallii (Schindl.) B.G. Schub. | Nuttall’s ticktrefoil |
| Quercus L. | oak |
| Phoradendron leucarpum (Raf.) Reveal & M.C. Johnst. | oak mistletoe |
| Oenothera oakesiana (A. Gray) J.W. Robbins ex S. Watson & J.M. Coult. | Oakes’ evening primrose |
| Potamogeton oakesianus J.W. Robbins | Oakes’ pondweed |
| Gymnocarpium Newman | oakfern |
| Erigeron quercifolius Lam. | oakleaf fleabane |
| Chenopodium glaucum L. | oakleaf goosefoot |
| Avena L. | oat |
| Arrhenatherum P. Beauv. | oatgrass |
| Physostegia virginiana (L.) Benth. | obedient plant |
| Obolaria L. | obolaria |
| Diarrhena obovata (Gleason) Brandenburg | obovate beakgrain |
| Shortia galacifolia Torr. & A. Gray | Oconee bells |
| Polygonella polygama (Vent.) Engelm. & A. Gray | October flower |
| Spiranthes ovalis Lindl. | October lady’s tresses |
| Aesculus glabra Willd. | Ohio buckeye |
| Carex oklahomensis Mack. | Oklahoma sedge |
| Abelmoschus Medik. | okra |
| Oldenlandia L. | oldenlandia |
| Rubus alumnus L.H. Bailey | oldfield blackberry |
| Matelea decipiens (Alexander) Woodson | oldfield milkvine |
| Senecio vulgaris L. | old-man-in-the-Spring |
| Poa saltuensis Fernald & Wiegand | oldpasture bluegrass |
| Artemisia stelleriana Besser | oldwoman |
| Elaeagnus L. | oleaster |
| Galium uniflorum Michx. | oneflower bedstraw |
| Orobanche uniflora L. | oneflowered broomrape |
| Pycnanthemum monotrichum Fernald | onehair mountainmint |
| Nasturtium microphyllum Boenn. ex Rchb. | onerow yellowcress |
| Sicyos angulatus L. | oneseed bur cucumber |
| Crataegus monogyna Jacq. | oneseed hawthorn |
| Allium L. | onion |
| Carex conoidea Schkuhr ex Willd. | openfield sedge |
| Dichanthelium laxiflorum (Lam.) Gould | openflower rosette grass |
| Papaver somniferum L. | opium poppy |
| Rudbeckia fulgida Aiton | orange coneflower |
| Hemerocallis fulva (L.) L. | orange daylily |
| Buddleja davidii Franch. | orange eye butterflybush |
| Hieracium aurantiacum L. | orange hawkweed |
| Caloplaca Th. Fr. | orange lichen |
| Polygala lutea L. | orange milkwort |
| Verbascum phlomoides L. | orange mullein |
| Triosteum aurantiacum E.P. Bicknell | orangefruit horse-gentian |
| Hypericum gentianoides (L.) Britton, Sterns & Poggenb. | orangegrass |
| Dactylis L. | orchardgrass |
| Origanum vulgare L. | oregano |
| Celastrus orbiculatus Thunb. | Oriental bittersweet |
| Youngia japonica (L.) DC. | Oriental false hawksbeard |
| Polygonum cespitosum Blume, nom. inq. | Oriental lady’s thumb |
| Papaver orientale L. | Oriental poppy |
| Origanum L. | origanum |
| Orthilia Raf. | orthilia |
| Maclura pomifera (Raf.) C.K. Schneid. | Osage-orange |
| Zigadenus densus (Desr.) Fernald | Osceola’s plume |
| Osmunda L. | osmunda |
| Matteuccia Todaro | ostrich fern |
| Polygonum arenastrum Jord. ex Boreau | oval-leaf knotweed |
| Carex cephalophora Muhl. ex Willd. | oval-leaf sedge |
| Aegilops geniculata Roth | ovate goatgrass |
| Quercus lyrata Walter | overcup oak |
| Carex stipata Muhl. ex Willd. var. stipata | owlfruit sedge |
| Leucanthemum vulgare Lam. | oxeye daisy |
| Picris L. | oxtongue |
| Clinopodium glabellum (Michx.) Kuntze | Ozark calamint |
| Sporobolus vaginiflorus (Torr. ex A. Gray) Alph. Wood var. ozarkanus (Fernald) Shinners | Ozark dropseed |
| Astragalus distortus Torr. & A. Gray | Ozark milkvetch |
| Malus zumi (Matsum.) Rehder | o-zumi |
| Pachysandra Michx. | pachysandra |
| Blephilia Raf. | pagoda-plant |
| Aesculus sylvatica W. Bartram | painted buckeye |
| Trillium undulatum Willd. | painted trillium |
| Rhynchospora pallida M.A. Curtis | pale beaksedge |
| Penstemon pallidus Small | pale beardtongue |
| Rumex altissimus Alph. Wood | pale dock |
| Torreyochloa pallida (Torr.) Church | pale false mannagrass |
| Calopogon pallidus Chapm. | pale grasspink |
| Arnoglossum atriplicifolium (L.) H. Rob. | pale Indian plantain |
| Alyssum alyssoides (L.) L. | pale madwort |
| Echinacea pallida (Nutt.) Nutt. | pale purple coneflower |
| Carex pallescens L. | pale sedge |
| Hypericum ellipticum Hook. | pale St. Johnswort |
| Impatiens pallida Nutt. | pale touch-me-not |
| Platanthera flava (L.) Lindl. | palegreen orchid |
| Helianthus strumosus L. | paleleaf woodland sunflower |
| Lobelia spicata Lam. | palespike lobelia |
| Iris pseudacorus L. | paleyellow iris |
| Cortaderia Stapf | pampas grass |
| Lilium iridollae Henry | panhandle lily |
| Panicum L. | panicgrass |
| Hydrangea paniculata Siebold | panicled hydrangea |
| Desmodium paniculatum (L.) DC. | panicledleaf ticktrefoil |
| Betula papyrifera Marshall | paper birch |
| Broussonetia papyrifera (L.) L’Hér. ex Vent. | paper mulberry |
| Carex tonsa (Fernald) E.P. Bicknell var. rugosperma (Mack.) Crins | parachute sedge |
| Malus pumila Mill. | paradise apple |
| Portulaca amilis Speg. | Paraguayan purslane |
| Acanthospermum australe (Loefl.) Kuntze | Paraguayan starbur |
| Carex umbellata Schkuhr ex Willd. | parasol sedge |
| Doellingeria umbellata (Mill.) Nees | parasol whitetop |
| Firmiana Marsili | parasoltree |
| Antennaria parlinii Fernald | Parlin’s pussytoes |
| Myriophyllum aquaticum (Vell.) Verdc. | parrot feather watermilfoil |
| Crataegus marshallii Eggl. | parsley hawthorn |
| Aphanes L. | parsley piert |
| Pastinaca L. | parsnip |
| Chamaecrista fasciculata (Michx.) Greene | partridge pea |
| Mitchella repens L. | partridgeberry |
| Passiflora L. | passionflower |
| Kyllinga gracillima Miq. | pasture spikesedge |
| Cirsium pumilum Spreng. | pasture thistle |
| Rumex patientia L. | patience dock |
| Paulownia Siebold & Zucc. | paulownia |
| Asimina Adans. | pawpaw |
| Paxistima Raf. | paxistima |
| Lathyrus L. | pea |
| Prunus persica (L.) Batsch | peach |
| Campanula persicifolia L. | peachleaf bellflower |
| Arachis L. | peanut |
| Pyrus L. | pear |
| Crataegus calpodendron (Ehrh.) Medik. | pear hawthorn |
| Pennisetum glaucum (L.) R. Br. | pearl millet |
| Exochorda Lindl. | pearlbrush |
| Sagina L. | pearlwort |
| Anaphalis DC. | pearly everlasting |
| Carya illinoinensis (Wangenh.) K. Koch | pecan |
| Carex peckii Howe | Peck’s sedge |
| Isoetes piedmontana (N.E. Pfeiffer) C.F. Reed | Peidmont quillwort |
| Parietaria L. | pellitory |
| Stylosanthes Sw. | pencilflower |
| Cardamine pensylvanica Muhl. ex Willd. | Pennsylvania bittercress |
| Rubus pensilvanicus Poir. | Pennsylvania blackberry |
| Silene caroliniana Walter ssp. pensylvanica (Michx.) R.T. Clausen | Pennsylvania catchfly |
| Lycopodium hickeyi W.H. Wagner, Beitel & Moran | Pennsylvania clubmoss |
| Gamochaeta pensylvanica (Willd.) Cabrera | Pennsylvania everlasting |
| Parietaria pensylvanica Muhl. ex Willd. | Pennsylvania pellitory |
| Juncus gymnocarpus Coville | Pennsylvania rush |
| Carex pensylvanica Lam. | Pennsylvania sedge |
| Polygonum pensylvanicum L. | Pennsylvania smartweed |
| Microthlaspi F.K. Mey. | pennycress |
| Penthorum L. | penthorum |
| Capsicum L. | pepper |
| Mentha ×piperita L. (pro sp.) [aquatica × spicata] | peppermint |
| Ampelopsis Michx. | peppervine |
| Lepidium L. | pepperweed |
| Lunaria rediviva L. | perennial honesty |
| Lathyrus latifolius L. | perennial pea |
| Lolium perenne L. | perennial ryegrass |
| Symphyotrichum tenuifolium (L.) G.L. Nesom | perennial saltmarsh aster |
| Diplotaxis tenuifolia (L.) DC. | perennial wallrocket |
| Uvularia perfoliata L. | perfoliate bellwort |
| Perilla L. | perilla |
| Vinca L. | periwinkle |
| Desmodium perplexum B.G. Schub. | perplexed ticktrefoil |
| Euphorbia peplus L. | petty spurge |
| Petunia Juss. | petunia |
| Phacelia Juss. | phacelia |
| Rubus philadelphicus Blanch. | Philadelphia blackberry |
| Erigeron philadelphicus L. | Philadelphia fleabane |
| Panicum philadelphicum Bernh. ex Trin. | Philadelphia panicgrass |
| Phlox L. | phlox |
| Phryma L. | phryma |
| Pontederia L. | pickerelweed |
| Salicornia L. | pickleweed |
| Cruciata pedemontana (Bellardi) Ehrend. | piedmont bedstraw |
| Utricularia olivacea C. Wright ex Griseb. | piedmont bladderwort |
| Oxypolis ternata (Nutt.) A. Heller | piedmont cowbane |
| Thalictrum macrostylum Small & A. Heller | piedmont meadow-rue |
| Ptilimnium nodosum (Rose) Mathias | piedmont mock bishopweed |
| Packera millefolium (Torr. & A. Gray) W.A. Weber & Á. Löve | piedmont ragwort |
| Callisia rosea (Vent.) D.R. Hunt | Piedmont roseling |
| Lyonia mariana (L.) D. Don | piedmont staggerbush |
| Clitoria L. | pigeonwings |
| Carya glabra (Mill.) Sweet | pignut hickory |
| Amaranthus L. | pigweed |
| Anagallis L. | pimpernel |
| Prunus pensylvanica L. f. | pin cherry |
| Quercus palustris Münchh. | pin oak |
| Pinus L. | pine |
| Zigadenus leimanthoides A. Gray | pine barren deathcamas |
| Cyperus retrorsus Chapm. | pine barren flatsedge |
| Gentiana autumnalis L. | pine barren gentian |
| Solidago fistulosa Mill. | pine barren goldenrod |
| Calamovilfa brevipilis (Torr.) Scribn. | pine barren sandreed |
| Minuartia caroliniana (Walter) Mattf. | pine barren stitchwort |
| Desmodium strictum (Pursh) DC. | pine barren ticktrefoil |
| Lilium catesbaei Walter | pine lily |
| Rhynchospora perplexa Britton | pineland beaksedge |
| Rubus hypolasius Fernald | pineland dewberry |
| Sida elliottii Torr. & A. Gray var. parviflora Chapm. | pineland fanpetals |
| Tetragonotheca helianthoides L. | pineland nerveray |
| Plantago sparsiflora Michx. | pineland plantain |
| Stipulicida setacea Michx. | pineland scalypink |
| Pityopsis aspera (Shuttlw. ex Small) Small | pineland silkgrass |
| Acalypha ostryifolia Riddell | pineland threeseed mercury |
| Monotropa hypopitys L. | pinesap |
| Sporobolus junceus (P. Beauv.) Kunth | pineywoods dropseed |
| Dianthus L. | pink |
| Rhododendron periclymenoides (Michx.) Shinners | pink azalea |
| Sclerolepis uniflora (Walter) Britton, Sterns & Poggenb. | pink bogbutton |
| Strophostyles umbellata (Muhl. ex Willd.) Britton | pink fuzzybean |
| Cleome hassleriana Chod. | pink queen |
| Ammannia latifolia L. | pink redstem |
| Drosera capillaris Poir. | pink sundew |
| Fleischmannia incarnata (Walter) R.M. King & H. Rob. | pink thoroughwort |
| Chelone lyonii Pursh | pink turtlehead |
| Oenothera speciosa Nutt. | pinkladies |
| Spigelia L. | pinkroot |
| Ratibida pinnata (Vent.) Barnhart | pinnate prairie coneflower |
| Lechea L. | pinweed |
| Aristolochia macrophylla Lam. | pipevine |
| Eriocaulon L. | pipewort |
| Chimaphila umbellata (L.) W.P.C. Barton | pipsissewa |
| Buckleya distichophylla (Nutt.) Torr. | piratebush |
| Pinus rigida Mill. | pitch pine |
| Sarracenia L. | pitcherplant |
| Minuartia patula (Michx.) Mattf. | pitcher’s stitchwort |
| Paspalum bifidum (Bertol.) Nash | pitchfork crowngrass |
| Chenopodium berlandieri Moq. | pitseed goosefoot |
| Dryopteris ×pittsfordensis Slosson [carthusiana × marginalis] | Pittsford woodfern |
| Rubus laudatus A. Berger | plains blackberry |
| Eragrostis intermedia Hitchc. | plains lovegrass |
| Muhlenbergia cuspidata (Torr. ex Hook.) Rydb. | plains muhly |
| Froelichia floridana (Nutt.) Moq. | plains snakecotton |
| Rubus plicatifolius Blanch. | plaitleaf dewberry |
| Plantago L. | plantain |
| Hosta Tratt. | plantain lily |
| Carex plantaginea Lam. | plantainleaf sedge |
| Polygonum tenue Michx. | pleatleaf knotweed |
| Pleuridium Rabenh. | pleuridium moss |
| Cyperus plukenetii Fernald | Plukenet’s flatsedge |
| Prunus L. | plum |
| Macleaya cordata (Willd.) R. Br. | plume poppy |
| Carduus L. | plumeless thistle |
| Malus prunifolia (Willd.) Borkh. | plumleaf crab apple |
| Rubus randolphiorum L.H. Bailey | Plymouth blackberry |
| Sabatia kennedyana Fernald | Plymouth rose gentian |
| Narcissus poeticus L. | poet’s narcissus |
| Pogonia Juss. | pogonia |
| Desmodium glutinosum (Muhl. ex Willd.) Alph. Wood | pointedleaf ticktrefoil |
| Conium L. | poison hemlock |
| Toxicodendron Mill. | poison oak |
| Toxicodendron vernix (L.) Kuntze | poison sumac |
| Asclepias exaltata L. | poke milkweed |
| Phytolacca L. | pokeweed |
| Polygala L. | polygala |
| Polypodium L. | polypody |
| Polypremum L. | polypremum |
| Poncirus Raf. | poncirus |
| Taxodium ascendens Brongn. | pond cypress |
| Pinus serotina Michx. | pond pine |
| Callitriche stagnalis Scop. | pond water-starwort |
| Nuphar Sm. | pond-lily |
| Litsea aestivalis (L.) Fernald | pondspice |
| Potamogeton L. | pondweed |
| Dichondra J.R. Forst. & G. Forst. | ponysfoot |
| Diodia teres Walter | poorjoe |
| Cyperus compressus L. | poorland flatsedge |
| Papaver L. | poppy |
| Callirhoe Nutt. | poppymallow |
| Calamagrostis porteri A. Gray | Porter’s reedgrass |
| Leucanthemum lacustre (Brot.) Samp. | Portuguese daisy |
| Ilex decidua Walter | possumhaw |
| Quercus stellata Wangenh. | post oak |
| Krigia dandelion (L.) Nutt. | potato dwarfdandelion |
| Bromus sterilis L. | poverty brome |
| Sporobolus vaginiflorus (Torr. ex A. Gray) Alph. Wood | poverty dropseed |
| Danthonia spicata (L.) P. Beauv. ex Roem. & Schult. | poverty oatgrass |
| Juncus tenuis Willd. | poverty rush |
| Amaranthus powellii S. Watson | Powell’s amaranth |
| Amphiachyris dracunculoides (DC.) Nutt. | prairie broomweed |
| Dalea L. | prairie clover |
| Ratibida Raf. | prairie coneflower |
| Spartina pectinata Bosc ex Link | prairie cordgrass |
| Eriochloa contracta Hitchc. | prairie cupgrass |
| Sporobolus heterolepis (A. Gray) A. Gray | prairie dropseed |
| Erigeron strigosus Muhl. ex Willd. | prairie fleabane |
| Packera plattensis (Nutt.) W.A. Weber & Á. Löve | prairie groundsel |
| Silphium terebinthinaceum Jacq. | prairie rosinweed |
| Carex prairea Dewey ex Alph. Wood | prairie sedge |
| Carex suberecta (Olney) Britton | prairie straw sedge |
| Helianthus petiolaris Nutt. | prairie sunflower |
| Croton monanthogynus Michx. | prairie tea |
| Aristida oligantha Michx. | prairie threeawn |
| Sphenopholis obtusata (Michx.) Scribn. | prairie wedgescale |
| Platanthera leucophaea (Nutt.) Lindl. | prairie white fringed orchid |
| Salix humilis Marshall | prairie willow |
| Carex woodii Dewey | pretty sedge |
| Carex atlantica L.H. Bailey | prickly bog sedge |
| Ribes lacustre (Pers.) Poir. | prickly currant |
| Sida spinosa L. | prickly fanpetals |
| Lactuca serriola L. | prickly lettuce |
| Salsola tragus L. | prickly Russian thistle |
| Carex spicata Huds. | prickly sedge |
| Zanthoxylum L. | pricklyash |
| Opuntia Mill. | pricklypear |
| Argemone L. | pricklypoppy |
| Dodecatheon meadia L. | pride of Ohio |
| Deutzia Thunb. | pride-of-Rochester |
| Narcissus ×medioluteus Mill. (pro sp.) [poeticus × tazetta] | primrose peerless |
| Ludwigia L. | primrose-willow |
| Chimaphila Pursh | prince’s pine |
| Paulownia tomentosa (Thunb.) Siebold & Zucc. ex Steud. | princesstree |
| Symphyotrichum pilosum (Willd.) G.L. Nesom var. pringlei (A. Gray) G.L. Nesom | Pringle’s aster |
| Ligustrum L. | privet |
| Polygala incarnata L. | procession flower |
| Panicum miliaceum L. | proso millet |
| Viola walteri House | prostrate blue violet |
| Anthemis secundiramea Biv. | prostrate chamomile |
| Lindernia procumbens (Knock.) Borb. | prostrate false pimpernel |
| Polygonum aviculare L. | prostrate knotweed |
| Amaranthus albus L. | prostrate pigweed |
| Chamaesyce prostrata (Aiton) Small | prostrate sandmat |
| Stellaria prostrata Baldw. | prostrate starwort |
| Desmodium rotundifolium DC. | prostrate ticktrefoil |
| Carex corrugata Fernald | prune-fruit sedge |
| Carex hirtifolia Mack. | pubescent sedge |
| Sporobolus neglectus Nash | puffsheath dropseed |
| Fraxinus profunda (Bush) Bush | pumpkin ash |
| Tribulus L. | puncturevine |
| Amaranthus blitum L. | purple amaranth |
| Callicarpa dichotoma (Lour.) K. Koch | purple beautyberry |
| Galium latifolium Michx. | purple bedstraw |
| Monarda media Willd. | purple bergamot |
| Andropogon glaucopsis Elliott | purple bluestem |
| Aronia ×prunifolia (Marshall) Rehder, (pro sp.) [arbutifolia × melanocarpa] | purple chokeberry |
| Pellaea atropurpurea (L.) Link | purple cliffbrake |
| Echinacea Moench | purple coneflower |
| Lamium purpureum L. | purple deadnettle |
| Agalinis purpurea (L.) Pennell | purple false foxglove |
| Platanthera peramoena (A. Gray) A. Gray | purple fringeless orchid |
| Agastache scrophulariifolia (Willd.) Kuntze | purple giant hyssop |
| Lythrum salicaria L. | purple loosestrife |
| Eragrostis spectabilis (Pursh) Steud. | purple lovegrass |
| Thaspium trifoliatum (L.) A. Gray | purple meadowparsnip |
| Asclepias purpurascens L. | purple milkweed |
| Polygala sanguinea L. | purple milkwort |
| Moricandia arvensis (L.) DC. | purple mistress |
| Passiflora incarnata L. | purple passionflower |
| Sarracenia purpurea L. | purple pitcherplant |
| Callirhoe involucrata (Torr. & A. Gray) A. Gray | purple poppymallow |
| Triplasis purpurea (Walter) Chapm. | purple sandgrass |
| Carex purpurifera Mack. | purple sedge |
| Eleocharis atropurpurea (Retz.) J. Presl & C. Presl | purple spikerush |
| Helianthus atrorubens L. | purpledisk sunflower |
| Rubus odoratus L. | purpleflowering raspberry |
| Helenium flexuosum Raf. | purplehead sneezeweed |
| Epilobium coloratum Biehler | purpleleaf willowherb |
| Salix purpurea L. | purpleosier willow |
| Symphyotrichum puniceum (L.) Á. Löve & D. Löve | purplestem aster |
| Bidens connata Muhl. ex Willd. | purplestem beggarticks |
| Tridens flavus (L.) Hitchc. | purpletop tridens |
| Verbena bonariensis L. | purpletop vervain |
| Crotalaria purshii DC. | Pursh’s rattlebox |
| Ruellia purshiana Fernald | Pursh’s wild petunia |
| Portulaca L. | purslane |
| Salix discolor Muhl. | pussy willow |
| Antennaria Gaertn. | pussytoes |
| Polygonum minus Huds. | pygmy smartweed |
| Monotropsis Schwein. ex Elliott | pygmypipes |
| Pyrularia Michx. | pyrularia |
| Pyxidanthera Michx. | pyxidanthera |
| Elymus repens (L.) Gould | quackgrass |
| Populus tremuloides Michx. | quaking aspen |
| Briza L. | quakinggrass |
| Filipendula Mill. | queen |
| Daucus carota L. | Queen Anne’s lace |
| Filipendula rubra (Hill) B.L. Rob. | queen of the prairie |
| Hieracium gronovii L. | queendevil |
| Stillingia sylvatica L. | queen’s-delight |
| Phemeranthus teretifolius (Pursh) Raf. | quill fameflower |
| Carex tenera Dewey | quill sedge |
| Isoetes L. | quillwort |
| Crotalaria rotundifolia Walter ex J.F. Gmel. | rabbitbells |
| Trifolium arvense L. | rabbitfoot clover |
| Polypogon Desf. | rabbitsfoot grass |
| Pseudognaphalium obtusifolium (L.) Hilliard & B.L. Burtt | rabbit-tobacco |
| Polygala polygama Walter | racemed milkwort |
| Raphanus L. | radish |
| Lychnis flos-cuculi L. | ragged robin |
| Ambrosia L. | ragweed |
| Packera Á. Löve & D. Löve | ragwort |
| Allium tricoccum Aiton | ramp |
| Campanula rapunculoides L. | rampion bellflower |
| Proboscidea louisianica (Mill.) Thell. | ram’s horn |
| Guizotia abyssinica (L. f.) Cass. | ramtilla |
| Solidago simplex Kunth ssp. randii (Porter) Ringius | Rand’s goldenrod |
| Scheuchzeria L. | rannoch-rush |
| Brassica napus L. | rape |
| Lycopodium obscurum L. | rare clubmoss |
| Crotalaria L. | rattlebox |
| Botrychium virginianum (L.) Sw. | rattlesnake fern |
| Glyceria canadensis (Michx.) Trin. | rattlesnake mannagrass |
| Goodyera R. Br. | rattlesnake plantain |
| Eryngium aquaticum L. | rattlesnakemaster |
| Prenanthes L. | rattlesnakeroot |
| Hieracium venosum L. | rattlesnakeweed |
| Dichanthelium ravenelii (Scribn. & Merr.) Gould | Ravenel’s rosette grass |
| Carex crus-corvi Shuttlw. ex Kunze | ravenfoot sedge |
| Ludwigia ravenii Peng | Raven’s primrose-willow |
| Scirpus flaccidifolius (Fernald) Schuyler | reclining bulrush |
| Rubus recurvans Blanch. | recurved blackberry |
| Amaranthus cruentus L. | red amaranth |
| Bromus rubens L. | red brome |
| Aesculus pavia L. | red buckeye |
| Silene dioica (L.) Clairville | red catchfly |
| Aronia arbutifolia (L.) Pers. | red chokeberry |
| Trifolium pratense L. | red clover |
| Aquilegia canadensis L. | red columbine |
| Ribes triste Pall. | red currant |
| Sambucus racemosa L. | red elderberry |
| Festuca rubra L. | red fescue |
| Crataegus chrysocarpa Ashe var. chrysocarpa | red haw |
| Carya ovalis (Wangenh.) Sarg. | red hickory |
| Eragrostis secundiflora J. Presl | red lovegrass |
| Acer rubrum L. | red maple |
| Asclepias rubra L. | red milkweed |
| Morus rubra L. | red mulberry |
| Pinus resinosa Aiton | red pine |
| Spergularia rubra (L.) J. Presl & C. Presl | red sandspurry |
| Picea rubens Sarg. | red spruce |
| Centaurea calcitrapa L. | red star-thistle |
| Trillium erectum L. | red trillium |
| Chelone obliqua L. | red turtlehead |
| Cercis L. | redbud |
| Cornus sericea L. | redosier dogwood |
| Asclepias variegata L. | redring milkweed |
| Amaranthus retroflexus L. | redroot amaranth |
| Cyperus erythrorhizos Muhl. | redroot flatsedge |
| Oenothera glazioviana Micheli | redsepal evening primrose |
| Ipomoea coccinea L. | redstar |
| Ammannia L. | redstem |
| Claytonia rubra (Howell) Tidestr. | redstem springbeauty |
| Erodium cicutarium (L.) L’Hér. ex Aiton | redstem stork’s bill |
| Agrostis gigantea Roth | redtop |
| Panicum rigidulum Bosc ex Nees | redtop panicgrass |
| Eubotrys recurvus (Buckley) Britton | redtwig doghobble |
| Polanisia dodecandra (L.) DC. | redwhisker clammyweed |
| Phragmites Adans. | reed |
| Phalaris arundinacea L. | reed canarygrass |
| Calamagrostis Adans. | reedgrass |
| Spiraea cantoniensis Lour. | Reeves’ meadowsweet |
| Cyperus refractus Engelm. ex Boeckeler | reflexed flatsedge |
| Carex retroflexa Muhl. ex Willd. | reflexed sedge |
| Lipocarpha rehmanii (Ridley) Goetghebeur, nom. inq. | Rehman’s halfchaff sedge |
| Cladina (Nyl.) Nyl. | reindeer lichen |
| Bromus catharticus Vahl | rescuegrass |
| Pleopeltis polypodioides (L.) Andrews & Windham | resurrection fern |
| Trifolium resupinatum L. | reversed clover |
| Carex reznicekii Werier | Reznicek’s sedge |
| Chloris gayana Kunth | Rhodes grass |
| Rhododendron L. | rhododendron |
| Rhodotypos Siebold & Zucc. | rhodotypos |
| Rheum L. | rhubarb |
| Carex virescens Muhl. ex Willd. | ribbed sedge |
| Potamogeton epihydrus Raf. | ribbonleaf pondweed |
| Oryza L. | rice |
| Symphyotrichum dumosum (L.) G.L. Nesom | rice button aster |
| Leersia oryzoides (L.) Sw. | rice cutgrass |
| Cyperus iria L. | ricefield flatsedge |
| Oryzopsis Michx. | ricegrass |
| Xyris jupicai Rich. | Richard’s yelloweyed grass |
| Collinsonia canadensis L. | richweed |
| Carex oligocarpa Schkuhr ex Willd. | richwoods sedge |
| Ricinus L. | ricinus |
| Linum striatum Walter | ridged yellow flax |
| Carex tetanica Schkuhr | rigid sedge |
| Lecanora Ach. | rim lichen |
| Aspicilia A. Massal. | rimmed lichen |
| Bromus diandrus Roth | ripgut brome |
| Betula nigra L. | river birch |
| Orobanche riparia L.T. Collins | River Broom-Rape |
| Bolboschoenus fluviatilis (Torr.) Soják | river bulrush |
| Vitis riparia Michx. | riverbank grape |
| Verbena riparia Raf. ex Small & A. Heller | riverbank vervain |
| Elymus riparius Wiegand | riverbank wildrye |
| Sesbania Scop. | riverhemp |
| Podostemum Michx. | riverweed |
| Thlaspi alliaceum L. | roadside pennycress |
| Lepidium ruderale L. | roadside pepperweed |
| Solidago roanensis Porter | Roan Mountain goldenrod |
| Prenanthes roanensis (Chickering) Chickering | Roan Mountain rattlesnakeroot |
| Carex roanensis F.J. Herm. | Roan Mountain sedge |
| Potamogeton robbinsii Oakes | Robbins’ pondweed |
| Eleocharis robbinsii Oakes | Robbins’ spikerush |
| Geranium robertianum L. | Robert geranium |
| Dalibarda repens L. | robin runaway |
| Erigeron pulchellus Michx. | robin’s plantain |
| Ranunculus micranthus Nutt. | rock buttercup |
| Huperzia porophila (Lloyd & Underw.) Holub | rock clubmoss |
| Taraxacum laevigatum (Willd.) DC. | rock dandelion |
| Solidago rupestris Raf. | rock goldenrod |
| Corydalis sempervirens (L.) Pers. | rock harlequin |
| Muhlenbergia sobolifera (Muhl. ex Willd.) Trin. | rock muhly |
| Polypodium virginianum L. | rock polypody |
| Arabidopsis Heynh. | rockcress |
| Hesperis L. | rocket |
| Chenopodium salinum Standl. | Rocky Mountain goosefoot |
| Asclepias tuberosa L. ssp. rolfsii (Britton ex Vail) Woodson | Rolfs’ milkweed |
| Eleocharis radicans (A. Dietr.) Kunth | rooted spikerush |
| Rosa L. | rose |
| Lychnis coronaria (L.) Desr. | rose campion |
| Trifolium hirtum All. | rose clover |
| Sabatia Adans. | rose gentian |
| Glandularia canadensis (L.) Nutt. | rose mock vervain |
| Portulaca grandiflora Hook. | rose moss |
| Sabatia stellaris Pursh | rose of Plymouth |
| Hibiscus syriacus L. | rose of Sharon |
| Cleistes Rich. ex Lindl. | rosebud orchid |
| Callisia Loefl. | roseling |
| Hibiscus L. | rosemallow |
| Sabatia angularis (L.) Pursh | rosepink |
| Dichanthelium (Hitchc. & Chase) Gould | rosette grass |
| Silphium L. | rosinweed |
| Carex rosea Schkuhr ex Willd. | rosy sedge |
| Rotala L. | rotala |
| Geum laciniatum Murray | rough avens |
| Echinochloa muricata (P. Beauv.) Fernald | rough barnyardgrass |
| Galium asprellum Michx. | rough bedstraw |
| Agrostis scabra Willd. | rough bentgrass |
| Poa trivialis L. | rough bluegrass |
| Eupatorium pilosum Walter | rough boneset |
| Diodia radula Cham. & Schltdl. | rough buttonweed |
| Xanthium strumarium L. | rough cocklebur |
| Sporobolus clandestinus (Biehler) Hitchc. | rough dropseed |
| Hedeoma hispida Pursh | rough false pennyroyal |
| Cyperus retrofractus (L.) Torr. | rough flatsedge |
| Hieracium scabrum Michx. | rough hawkweed |
| Richardia scabra L. | rough Mexican clover |
| Dichanthelium leucothrix (Nash) Freckmann | rough panicgrass |
| Spermolepis divaricata (Walter) Raf. ex Ser. | roughfruit scaleseed |
| Dichanthelium strigosum (Muhl. ex Elliott) Freckmann | roughhair rosette grass |
| Oryzopsis asperifolia Michx. | roughleaf ricegrass |
| Gratiola virginiana L. | roundfruit hedgehyssop |
| Lespedeza capitata Michx. | roundhead lespedeza |
| Juncus validus Coville | roundhead rush |
| Silene rotundifolia Nutt. | roundleaf catchfly |
| Cornus rugosa Lam. | roundleaf dogwood |
| Solidago patula Muhl. ex Willd. | roundleaf goldenrod |
| Smilax rotundifolia L. | roundleaf greenbrier |
| Packera obovata (Muhl. ex Willd.) W.A. Weber & Á. Löve | roundleaf ragwort |
| Amelanchier sanguinea (Pursh) DC. | roundleaf serviceberry |
| Drosera rotundifolia L. | roundleaf sundew |
| Eupatorium rotundifolium L. | roundleaf thoroughwort |
| Viola rotundifolia Michx. | roundleaf yellow violet |
| Hepatica nobilis Schreb. var. obtusa (Pursh) Steyerm. | roundlobe hepatica |
| Dichanthelium sphaerocarpon (Elliott) Gould | roundseed panicgrass |
| Osmunda regalis L. | royal fern |
| Ruta L. | rue |
| Thalictrum thalictroides (L.) Eames & B. Boivin | rue anemone |
| Scirpus pendulus Muhl. | rufous bulrush |
| Rosa rugosa Thunb. | rugosa rose |
| Lycopodium clavatum L. | running clubmoss |
| Trifolium calcaricum J.L. Collins & T.F. Wieboldt | running glade clover |
| Amelanchier stolonifera Wiegand | running serviceberry |
| Juncus L. | rush |
| Chondrilla juncea L. | rush skeletonweed |
| Elaeagnus angustifolia L. | Russian olive |
| Salsola L. | Russian thistle |
| Viburnum rufidulum Raf. | rusty blackhaw |
| Woodsia ilvensis (L.) R. Br. | rusty woodsia |
| Hexastylis arifolia (Michx.) Small var. ruthii (Ashe) Blomquist | Ruth’s littlebrownjug |
| Carex ruthii Mack. | Ruth’s sedge |
| Secale L. | rye |
| Bromus secalinus L. | rye brome |
| Lolium L. | ryegrass |
| Nandina domestica Thunb. | sacred bamboo |
| Datura wrightii Regel | sacred thorn-apple |
| Salvia L. | sage |
| Artemisia L. | sagebrush |
| Stuckenia pectinata (L.) Börner | sago pondweed |
| Viola ×esculenta Elliott (pro sp.) [septemloba × triloba] | salad violet |
| Atriplex subspicata (Nutt.) Rydb. | saline saltbush |
| Salpichroa Miers | salpichroa |
| Tragopogon porrifolius L. | salsify |
| Heliotropium curassavicum L. | salt heliotrope |
| Spergularia salina J. Presl & C. Presl | salt sandspurry |
| Atriplex L. | saltbush |
| Tamarix ramosissima Ledeb. | saltcedar |
| Distichlis Raf. | saltgrass |
| Puccinellia fasciculata (Torr.) E.P. Bicknell | saltmarsh alkaligrass |
| Agalinis maritima (Raf.) Raf. | saltmarsh false foxglove |
| Eleocharis halophila (Fernald & Brack.) Fernald & Brack. | saltmarsh spikerush |
| Fuirena breviseta (Coville) Coville | saltmarsh umbrella-sedge |
| Spartina patens (Aiton) Muhl. | saltmeadow cordgrass |
| Juncus gerardii Loisel. | saltmeadow rush |
| Orbexilum pedunculatum (Mill.) Rydb. | Sampson’s snakeroot |
| Cardamine parviflora L. | sand bittercress |
| Rubus cuneifolius Pursh | sand blackberry |
| Sporobolus cryptandrus (Torr.) A. Gray | sand dropseed |
| Vitis rupestris Scheele | sand grape |
| Carya pallida (Ashe) Engl. & Graebn. | sand hickory |
| Eragrostis trichodes (Nutt.) Alph. Wood | sand lovegrass |
| Plantago arenaria Waldst. & Kit. | sand plantain |
| Quercus margaretta (Ashe) Small | sand post oak |
| Carex arenaria L. | sand sedge |
| Desmodium lineatum DC. | sand ticktrefoil |
| Viola affinis Leconte | sand violet |
| Eragrostis frankii C.A. Mey. ex Steud. | sandbar lovegrass |
| Salix interior Rowlee | sandbar willow |
| Zigadenus glaberrimus Michx. | sandbog deathcamas |
| Cenchrus L. | sandbur |
| Cenchrus tribuloides L. | sanddune sandbur |
| Erysimum capitatum (Douglas ex Hook.) Greene | sanddune wallflower |
| Triplasis P. Beauv. | sandgrass |
| Amaranthus arenicola I.M. Johnst. | sandhill amaranth |
| Hypericum lloydii (Svens.) P. Adams | sandhill St. Johnswort |
| Cirsium repandum Michx. | sandhill thistle |
| Lilium pyrophilum M.W. Skinner & Sorrie | Sandhills Lily |
| Chamaesyce Gray | sandmat |
| Verbena scabra Vahl | sandpaper vervain |
| Linum intercursum E.P. Bicknell | sandplain flax |
| Calamovilfa (A. Gray) Hack. ex Scribn. & Southworth | sandreed |
| Spergularia (Pers.) J. Presl & C. Presl | sandspurry |
| Arenaria L. | sandwort |
| Bulbostylis stenophylla (Elliott) C.B. Clarke | sandy field hairsedge |
| Rubus iniens L.H. Bailey | sandyfield dewberry |
| Polanisia dodecandra (L.) DC. ssp. trachysperma (Torr. & A. Gray) Iltis | sandyseed clammyweed |
| Carphephorus bellidifolius (Michx.) Torr. & A. Gray | sandywoods chaffhead |
| Sanicula L. | sanicle |
| Parthenium hysterophorus L. | Santa Maria feverfew |
| Sassafras Nees & Eberm. | sassafras |
| Clematis catesbyana Pursh | satincurls |
| Imperata Cirillo | satintail |
| Saururus L. | saururus |
| Rhynchospora debilis Gale | savannah beaksedge |
| Ludwigia virgata Michx. | savannah primrose-willow |
| Phanopyrum (Raf.) Nash | savannah-panicgrass |
| Satureja L. | savory |
| Smilax bona-nox L. | saw greenbrier |
| Cladium P. Br. | sawgrass |
| Rubus argutus Link | sawtooth blackberry |
| Quercus acutissima Carruthers | sawtooth oak |
| Helianthus grosseserratus M. Martens | sawtooth sunflower |
| Saxifraga L. | saxifrage |
| Petrorhagia saxifraga (L.) Link | saxifrage pink |
| Cuscuta gronovii Willd. ex Schult. | scaldweed |
| Spermolepis Raf. | scaleseed |
| Liatris squarrosa (L.) Michx. | scaly blazing star |
| Pleopeltis Humb. & Bonpl. ex Willd. | scaly polypody |
| Monarda didyma L. | scarlet beebalm |
| Pyracantha coccinea M. Roem. | scarlet firethorn |
| Crataegus pedicellata Sarg. | scarlet hawthorn |
| Castilleja coccinea (L.) Spreng. | scarlet Indian paintbrush |
| Quercus coccinea Münchh. | scarlet oak |
| Anagallis arvensis L. | scarlet pimpernel |
| Hibiscus coccineus Walter | scarlet rosemallow |
| Phaseolus coccineus L. | scarlet runner |
| Boerhavia coccinea Mill. | scarlet spiderling |
| Ipomoea hederifolia L. | scarletcreeper |
| Philadelphus inodorus L. | scentless mock orange |
| Eurybia schreberi (Nees) Nees | Schreber’s aster |
| Crataegus schuettei Ashe | Schuette’s hawthorn |
| Schwalbea L. | schwalbea |
| Carex schweinitzii Dewey ex Schwein. | Schweinitz’s sedge |
| Cytisus scoparius (L.) Link | Scotch broom |
| Onopordum acanthium L. | Scotch cottonthistle |
| Rosa spinosissima L. | Scotch rose |
| Equisetum hyemale L. | scouringrush horsetail |
| Crataegus putata Sarg. | Scranton hawthorn |
| Croptilon Raf. | scratchdaisy |
| Bartonia Muhl. ex Willd. | screwstem |
| Hieracium scribneri Small | Scribner’s hawkweed |
| Dichanthelium oligosanthes (Schult.) Gould var. scribnerianum (Nash) Gould | Scribner’s rosette grass |
| Limonium Mill. | sea lavender |
| Glaux maritima L. | sea milkwort |
| Oenothera humifusa Nutt. | seabeach evening primrose |
| Angelica lucida L. | seacoast angelica |
| Iva imbricata Walter | seacoast marsh elder |
| Uniola L. | seaoats |
| Sesuvium L. | seapurslane |
| Cakile Mill. | searocket |
| Sporobolus virginicus (L.) Kunth | seashore dropseed |
| Calystegia soldanella (L.) R. Br. | seashore false bindweed |
| Amaranthus pumilus Raf. | seaside amaranth |
| Samolus valerandi L. | seaside brookweed |
| Eryngium maritimum L. | seaside eryngo |
| Solidago sempervirens L. | seaside goldenrod |
| Polygonum glaucum Nutt. | seaside knotweed |
| Calibrachoa parviflora (Juss.) D’Arcy | seaside petunia |
| Chamaesyce polygonifolia (L.) Small | seaside sandmat |
| Honckenya peploides (L.) Ehrh. | seaside sandplant |
| Borrichia Adans. | seaside tansy |
| Aristida tuberculosa Nutt. | seaside threeawn |
| Zostera marina L. | seawrack |
| Carex L. | sedge |
| Ludwigia alternifolia L. | seedbox |
| Suaeda Forssk. ex J.F. Gmel. | seepweed |
| Prunella L. | selfheal |
| Polygala senega L. | Seneca snakeroot |
| Senna Mill. | senna |
| Onoclea L. | sensitive fern |
| Chamaecrista nictitans (L.) Moench | sensitive partridge pea |
| Chamaecrista (L.) Moench | sensitive pea |
| Mimosa L. | sensitive plant |
| Carex divisa Huds. | separated sedge |
| Senna occidentalis (L.) Link | septicweed |
| Lespedeza cuneata (Dum. Cours.) G. Don | sericea lespedeza |
| Amelanchier Medik. | serviceberry |
| Prunus susquehanae hort. ex Willd. | Sesquehana sandcherry |
| Sagittaria rigida Pursh | sessilefruit arrowhead |
| Uvularia sessilifolia L. | sessileleaf bellwort |
| Desmodium sessilifolium (Torr.) Torr. & A. Gray | sessileleaf ticktrefoil |
| Eriocaulon aquaticum (Hill) Druce | sevenangle pipewort |
| Rubus sewardianus Fernald | Seward’s blackberry |
| Micranthemum umbrosum (J.F. Gmel.) S.F. Blake | shade mudflower |
| Ponthieva R. Br. | shadow witch |
| Carya ovata (Mill.) K. Koch | shagbark hickory |
| Liatris pilosa (Aiton) Willd. | shaggy blazing star |
| Digitaria villosa (Walter) Pers. | shaggy crabgrass |
| Gratiola pilosa Michx. | shaggy hedgehyssop |
| Galinsoga quadriradiata Cav. | shaggy soldier |
| Eriogonum allenii S. Watson | shale barren buckwheat |
| Oenothera argillicola Mack. | shale barren evening primrose |
| Antennaria virginica Stebbins | shale barren pussytoes |
| Packera antennariifolia (Britton) W.A. Weber & Á. Löve | shale barren ragwort |
| Arabis serotina Steele | shale barren rockcress |
| Carex lurida Wahlenb. | shallow sedge |
| Mimosa pudica L. | shameplant |
| Kickxia elatine (L.) Dumort. | sharpleaf cancerwort |
| Hypericum virgatum Lam. | sharpleaf St. Johnswort |
| Hepatica nobilis Schreb. var. acuta (Pursh) Steyerm. | sharplobe hepatica |
| Carex oxylepis Torr. & Hook. | sharpscale sedge |
| Mimulus alatus Aiton | sharpwing monkeyflower |
| Carex tonsa (Fernald) E.P. Bicknell | shaved sedge |
| Kalmia angustifolia L. | sheep laurel |
| Carya laciniosa (Michx. f.) G. Don | shellbark hickory |
| Teesdalia W.T. Aiton | shepardscress |
| Capsella bursa-pastoris (L.) Medik. | shepherd’s purse |
| Sherardia L. | sherardia |
| Quercus imbricaria Michx. | shingle oak |
| Galium concinnum Torr. & A. Gray | shining bedstraw |
| Huperzia lucidula (Michx.) Trevis. | shining clubmoss |
| Spiranthes lucida (H.H. Eaton) Ames | shining lady’s tresses |
| Salix lucida Muhl. | shining willow |
| Sphenopholis nitida (Biehler) Scribn. | shiny wedgescale |
| Spiraea corymbosa Raf. | shinyleaf meadowsweet |
| Vittaria Sm. | shoestring fern |
| Dodecatheon L. | shootingstar |
| Schizachyrium littorale (Nash) E.P. Bicknell | shore little bluestem |
| Isoetes riparia Engelm. ex A. Braun | shore quillwort |
| Carex hyalinolepis Steud. | shoreline sedge |
| Alopecurus aequalis Sobol. | shortawn foxtail |
| Sagittaria brevirostra Mack. & Bush | shortbeak arrowhead |
| Rhynchospora nitens (Vahl) A. Gray | shortbeak beaksedge |
| Carex brevior (Dewey) Mack. | shortbeak sedge |
| Saccharum brevibarbe (Michx.) Pers. | shortbeard plumegrass |
| Rhynchospora corniculata (Lam.) A. Gray | shortbristle horned beaksedge |
| Solidago canadensis L. var. gilvocanescens Rydb. | shorthair goldenrod |
| Brachyelytrum P. Beauv. | shorthusk |
| Shortia Torr. & A. Gray | shortia |
| Pinus echinata Mill. | shortleaf pine |
| Gymnopogon brevifolius Trin. | shortleaf skeletongrass |
| Helenium brevifolium (Nutt.) Alph. Wood | shortleaf sneezeweed |
| Kyllinga brevifolia Rottb. | shortleaf spikesedge |
| Draba brachycarpa Nutt. ex Torr. & A. Gray | shortpod draba |
| Symphyotrichum shortii (Lindl.) G.L. Nesom | Short’s aster |
| Gratiola viscidula Pennell | Short’s hedgehyssop |
| Arabis shortii (Fernald) Gleason | Short’s rockcress |
| Carex shortiana Dewey | Short’s sedge |
| Chaerophyllum procumbens (L.) Crantz var. shortii Torr. & A. Gray | Short’s spreading chervil |
| Myriophyllum sibiricum Kom. | shortspike watermilfoil |
| Cerastium brachypodum (Engelm. ex A. Gray) B.L. Rob. | shortstalk chickweed |
| Calystegia silvatica (Kit.) Griseb. | shortstalk false bindweed |
| Gypsophila elegans M. Bieb. | showy baby’s-breath |
| Ranunculus acris L. var. acris | showy buttercup |
| Lonicera ×bella Zabel [morrowii × tatarica] | showy fly honeysuckle |
| Forsythia ×intermedia Zabel [suspensa × viridissima] | showy forsythia |
| Gentiana decora Pollard | showy gentian |
| Solidago erecta Pursh | showy goldenrod |
| Cypripedium reginae Walter | showy lady’s slipper |
| Galearis spectabilis (L.) Raf. | showy orchid |
| Crotalaria spectabilis Roth | showy rattlebox |
| Scutellaria serrata Andrews | showy skullcap |
| Desmodium canadense (L.) DC. | showy ticktrefoil |
| Iris virginica L. var. shrevei (Small) E.S. Anderson | Shreve’s iris |
| Platanthera ×shriveri P.M. Br., (pro. sp.) [grandiflora × lacera] | Shriver’s purple fringed orchid |
| Lespedeza bicolor Turcz. | shrub lespedeza |
| Sibbaldiopsis tridentata (Aiton) Rydb. | shrubby fivefingers |
| Lespedeza frutescens (L.) Hornem. | shrubby lespedeza |
| Hypericum prolificum L. | shrubby St. Johnswort |
| Quercus shumardii Buckley var. shumardii | Shumard oak |
| Quercus shumardii Buckley | Shumard’s oak |
| Sibbaldiopsis Rydb. | sibbaldiopsis |
| Malus baccata (L.) Borkh. | Siberian crab apple |
| Ulmus pumila L. | Siberian elm |
| Euphorbia falcata L. | sickle spurge |
| Coreopsis falcata Boynt. | sickle tickseed |
| Parapholis C.E. Hubbard | sicklegrass |
| Arabis canadensis L. | sicklepod |
| Falcaria vulgaris Bernh. | sickleweed |
| Stylosanthes biflora (L.) Britton, Sterns & Poggenb. | sidebeak pencilflower |
| Orthilia secunda (L.) House | sidebells wintergreen |
| Bouteloua curtipendula (Michx.) Torr. | sideoats grama |
| Viburnum sieboldii Miq. | Siebold’s arrowwood |
| Phaseolus lunatus L. | sieva bean |
| Brachiaria (Trin.) Griseb. | signalgrass |
| Portulaca halimoides L. | silkcotton purslane |
| Pityopsis Nutt. | silkgrass |
| Albizia julibrissin Durazz. | silktree |
| Stewartia malacodendron L. | silky camellia |
| Cornus amomum Mill. | silky dogwood |
| Salix sericea Marshall | silky willow |
| Potentilla argentea L. | silver cinquefoil |
| Celosia argentea L. | silver cock’s comb |
| Deparia acrostichoides (Sw.) M. Kato | silver false spleenwort |
| Aira caryophyllea L. | silver hairgrass |
| Acer saccharinum L. | silver maple |
| Saccharum alopecuroides (L.) Nutt. | silver plumegrass |
| Halesia Ellis ex L. | silverbell |
| Miscanthus Andersson | silvergrass |
| Gamochaeta argyrinea G.L. Nesom | silvery everlasting |
| Paronychia argyrocoma (Michx.) Nutt. | silvery nailwort |
| Carex canescens L. | silvery sedge |
| Antennaria solitaria Rydb. | singlehead pussytoes |
| Luffa acutangula (L.) Roxb. | sinkwa towelsponge |
| Vulpia octoflora (Walter) Rydb. | sixweeks fescue |
| Gymnopogon P. Beauv. | skeletongrass |
| Scutellaria L. | skullcap |
| Veronica scutellata L. | skullcap speedwell |
| Symplocarpus Salisb. ex W.P.C. Barton | skunk cabbage |
| Ribes glandulosum Grauer | skunk currant |
| Silene antirrhina L. | sleepy silene |
| Amaranthus viridis L. | slender amaranth |
| Eurybia compacta G.L. Nesom | slender aster |
| Rhynchospora gracilenta A. Gray | slender beaksedge |
| Iris prismatica Pursh ex Ker Gawl. | slender blue iris |
| Veratrum hybridum (Walter) J.H. Zimmerman ex Zomlefer | slender bunchflower |
| Lycopodiella caroliniana (L.) Pic. Serm. | slender clubmoss |
| Digitaria filiformis (L.) Koeler | slender crabgrass |
| Fimbristylis autumnalis (L.) Roem. & Schult. | slender fimbry |
| Cyperus bipartitus Torr. | slender flatsedge |
| Euthamia caroliniana (L.) Greene ex Porter & Britton | slender goldentop |
| Sorghastrum elliottii (C. Mohr) Nash | slender Indiangrass |
| Lespedeza virginica (L.) Britton | slender lespedeza |
| Cheilanthes feei T. Moore | slender lipfern |
| Carex gracilescens Steud. | slender looseflower sedge |
| Alopecurus myosuroides Huds. | slender meadow foxtail |
| Scleria minor W. Stone | slender nutrush |
| Aphanes microcarpa (Boiss. & Reut.) Rothm. | slender parsley piert |
| Plantago heterophylla Nutt. | slender plantain |
| Prenanthes autumnalis Walter | slender rattlesnakeroot |
| Sabatia campanulata (L.) Torr. | slender rose gentian |
| Croptilon divaricatum (Nutt.) Raf. | slender scratchdaisy |
| Sesuvium maritimum (Walter) Britton, Sterns & Poggenb. | slender seapurslane |
| Froelichia gracilis (Hook.) Moq. | slender snakecotton |
| Eleocharis tenuis (Willd.) Schult. | slender spikerush |
| Acalypha gracilens A. Gray | slender threeseed mercury |
| Cardamine angustata O.E. Schulz | slender toothwort |
| Myriophyllum tenellum Bigelow | slender watermilfoil |
| Najas gracillima (A. Braun ex Engelm.) Magnus | slender waternymph |
| Sphenopholis intermedia (Rydb.) Rydb. | slender wedgescale |
| Elymus trachycaulus (Link) Gould ex Shinners | slender wheatgrass |
| Carex digitalis Willd. | slender woodland sedge |
| Chasmanthium laxum (L.) Yates | slender woodoats |
| Oxalis dillenii Jacq. | slender yellow woodsorrel |
| Xyris torta Sm. | slender yelloweyed grass |
| Physostegia leptophylla Small | slenderleaf false dragonhead |
| Agalinis tenuifolia (Vahl) Raf. | slenderleaf false foxglove |
| Strophostyles leiosperma (Torr. & A. Gray) Piper | slickseed fuzzybean |
| Amaranthus hybridus L. | slim amaranth |
| Muhlenbergia tenuiflora (Willd.) Britton, Sterns & Poggenb. | slimflower muhly |
| Dichanthelium linearifolium (Scribn. ex Nash) Gould | slimleaf panicgrass |
| Desmodium tenuifolium Torr. & A. Gray | slimleaf ticktrefoil |
| Juncus diffusissimus Buckley | slimpod rush |
| Aristida longespica Poir. | slimspike threeawn |
| Ulmus rubra Muhl. | slippery elm |
| Bidens discoidea (Torr. & A. Gray) Britton | small beggarticks |
| Vaccinium tenellum Aiton | small black blueberry |
| Campanula divaricata Michx. | small bonny bellflower |
| Anchusa arvensis (L.) M. Bieb. | small bugloss |
| Sanguisorba minor Scop. | small burnet |
| Arthraxon hispidus (Thunb.) Makino | small carpetgrass |
| Vaccinium oxycoccos L. | small cranberry |
| Circaea alpina L. | small enchanter’s nightshade |
| Geranium pusillum L. | small geranium |
| Platanthera clavellata (Michx.) Luer | small green wood orchid |
| Cardamine clematitis Shuttlw. ex A. Gray | small mountain bittercress |
| Potamogeton pusillus L. | small pondweed |
| Antennaria howellii Greene ssp. petaloidea (Fernald) Bayer | small pussytoes |
| Scutellaria parvula Michx. | small skullcap |
| Cleistes bifaria (Fernald) Catling & Gregg | small spreading pogonia |
| Triodanis biflora (Ruiz & Pav.) Greene | small Venus’ looking-glass |
| Elatine minima (Nutt.) Fisch. & C.A. Mey. | small waterwort |
| Viola macloskeyi Lloyd | small white violet |
| Isotria medeoloides (Pursh) Raf. | small whorled pogonia |
| Helianthus microcephalus Torr. & A. Gray | small woodland sunflower |
| Smallanthus Mack. ex Small | smallanthus |
| Nemophila aphylla (L.) Brummitt | smallflower baby blue eyes |
| Ranunculus parviflorus L. | smallflower buttercup |
| Agalinis paupercula (A. Gray) Britton | smallflower false foxglove |
| Lipocarpha micrantha (Vahl) G. Tucker | smallflower halfchaff sedge |
| Crepis pulchra L. | smallflower hawksbeard |
| Asimina parviflora (Michx.) Dunal | smallflower pawpaw |
| Phacelia dubia (L.) Trel. | smallflower phacelia |
| Rosa micrantha Borrer ex Sm. | smallflower sweetbrier |
| Tamarix parviflora DC. | smallflower tamarisk |
| Eupatorium semiserratum DC. | smallflower thoroughwort |
| Agrimonia microcarpa Wallr. | smallfruit agrimony |
| Bidens mitis (Michx.) Sherff | smallfruit beggarticks |
| Eleocharis microcarpa Torr. | smallfruit spikerush |
| Rhynchospora microcephala (Britton) Britton | smallhead beaksedge |
| Juncus brachycephalus (Engelm.) Buchenau | smallhead rush |
| Sanicula smallii E.P. Bicknell | Small’s blacksnakeroot |
| Solidago pinetorum Small | Small’s goldenrod |
| Celtis laevigata Willd. var. smallii (Beadle) Sarg. | Small’s hackberry |
| Portulaca smallii P. Wilson | Small’s purslane |
| Packera anonyma (Alph. Wood) W.A. Weber & Á. Löve | Small’s ragwort |
| Scutellaria multiglandulosa (Kearney) Small ex Harper | Small’s skullcap |
| Xyris smalliana Nash | Small’s yelloweyed grass |
| Boehmeria cylindrica (L.) Sw. | smallspike false nettle |
| Cuscuta polygonorum Engelm. | smartweed dodder |
| Rubus pernagaeus Fernald | Smithfield blackberry |
| Schoenoplectiella smithii (A. Gray) Hayas. | Smith’s bulrush |
| Rhododendron arborescens (Pursh) Torr. | smooth azalea |
| Bidens laevis (L.) Britton, Sterns & Poggenb. | smooth beggartick |
| Rubus canadensis L. | smooth blackberry |
| Symphyotrichum laeve (L.) Á. Löve & D. Löve | smooth blue aster |
| Bromus inermis Leyss. | smooth brome |
| Smilax herbacea L. | smooth carrionflower |
| Pellaea glabella Mett. ex Kuhn | smooth cliffbrake |
| Spartina alterniflora Loisel. | smooth cordgrass |
| Digitaria ischaemum (Schreb.) Schreb. ex Muhl. | smooth crabgrass |
| Elephantopus nudatus A. Gray | smooth elephantsfoot |
| Spermacoce glabra Michx. | smooth false buttonweed |
| Paronychia canadensis (L.) Alph. Wood | smooth forked nailwort |
| Crepis capillaris (L.) Wallr. | smooth hawksbeard |
| Stachys tenuifolia Willd. | smooth hedgenettle |
| Heliopsis helianthoides (L.) Sweet | smooth oxeye |
| Phlox glaberrima L. | smooth phlox |
| Echinacea laevigata (C.L. Boynt. & Beadle) S.F. Blake | smooth purple coneflower |
| Scutellaria saxatilis Riddell | smooth rock skullcap |
| Arabis laevigata (Muhl. ex Willd.) Poir. | smooth rockcress |
| Rosa blanda Aiton | smooth rose |
| Cladium mariscoides (Muhl.) Torr. | smooth sawgrass |
| Desmodium marilandicum (L.) DC. | smooth small-leaf ticktrefoil |
| Polygonatum biflorum (Walter) Elliott | smooth Solomon’s seal |
| Rhus glabra L. | smooth sumac |
| Helianthus laevigatus Torr. & A. Gray | smooth sunflower |
| Desmodium laevigatum (Nutt.) DC. | smooth ticktrefoil |
| Symphyotrichum racemosum (Elliott) G.L. Nesom | smooth white oldfield aster |
| Viola macloskeyi Lloyd ssp. pallens (Banks ex Ging) M.S. Baker | smooth white violet |
| Ilex laevigata (Pursh) A. Gray | smooth winterberry |
| Aureolaria flava (L.) Farw. | smooth yellow false foxglove |
| Carex laevivaginata (Kük.) Mack. | smoothsheath sedge |
| Bassia All. | smotherweed |
| Sporobolus indicus (L.) R. Br. | smut grass |
| Potamogeton bicupulatus Fernald | snailseed pondweed |
| Froelichia Moench | snakecotton |
| Pogonia ophioglossoides (L.) Ker Gawl. | snakemouth orchid |
| Ageratina Spach | snakeroot |
| Antirrhinum L. | snapdragon |
| Helenium L. | sneezeweed |
| Rhynchosia Lour. | snoutbean |
| Euphorbia marginata Pursh | snow on the mountain |
| Trillium nivale Riddell | snow trillium |
| Styrax L. | snowbell |
| Gaultheria L. | snowberry |
| Galanthus L. | snowdrop |
| Leucojum L. | snowflake |
| Platanthera nivea (Nutt.) Luer | snowy orchid |
| Saponaria L. | soapwort |
| Agrimonia pubescens Wallr. | soft agrimony |
| Bromus hordeaceus L. | soft brome |
| Carex conjuncta Boott | soft fox sedge |
| Chrysopsis pilosa Nutt. | soft goldenaster |
| Cirsium carolinianum (Walter) Fernald & B.G. Schub. | soft thistle |
| Onosmodium bejariense DC. ex A. DC. var. hispidissimum (Mack.) B.L. Turner | softhair marbleseed |
| Onosmodium bejariense DC. ex A. DC. | soft-hair marbleseed |
| Schoenoplectus tabernaemontani (C.C. Gmel.) Palla | softstem bulrush |
| Pimpinella saxifraga L. | solidstem burnet saxifrage |
| Polygonatum Mill. | Solomon’s seal |
| Pinus ×sondereggeri H.H. Chapm. ex Sudw. [palustris × taeda] | Sonderegger pine |
| Sorghum Moench | sorghum |
| Saccharum brevibarbe (Michx.) Pers. var. contortum (Elliott) R. Webster | sortbeard plumegrass |
| Prunus cerasus L. | sour cherry |
| Oxydendrum DC. | sourwood |
| Elymus glabriflorus (Vasey ex L.H. Dewey) Scribn. & C.R. Ball | southeastern wildrye |
| Ophioglossum vulgatum L. | southern adderstongue |
| Amaranthus australis (A. Gray) Sauer | southern amaranth |
| Symphyotrichum divaricatum (Nutt.) G.L. Nesom | southern annual saltmarsh aster |
| Viburnum dentatum L. | southern arrowwood |
| Morella caroliniensis (Mill.) Small | southern bayberry |
| Utricularia juncea Vahl | southern bladderwort |
| Aconitum uncinatum L. | southern blue monkshood |
| Vaccinium formosum Andrews | southern blueberry |
| Lycopodiella appressa (Chapm.) Cranfill | southern bog clubmoss |
| Catalpa bignonioides Walter | southern catalpa |
| Typha domingensis Pers. | southern cattail |
| Malus angustifolia (Aiton) Michx. | southern crab apple |
| Digitaria ciliaris (Retz.) Koeler | southern crabgrass |
| Leersia hexandra Sw. | southern cutgrass |
| Stylisma humistrata (Walter) Chapm. | southern dawnflower |
| Rubus trivialis Michx. | southern dewberry |
| Lobelia amoena Michx. | southern lobelia |
| Carex lonchocarpa Willd. | southern long sedge |
| Magnolia grandiflora L. | southern magnolia |
| Vaccinium erythrocarpum Michx. | southern mountain cranberry |
| Pycnanthemum pycnanthemoides (Leavenworth) Fernald | southern mountainmint |
| Sarracenia purpurea L. var. venosa (Raf.) Fernald | southern purple pitcherplant |
| Quercus falcata Michx. | southern red oak |
| Cenchrus echinatus L. | southern sandbur |
| Carex austrina (Small) Mack. | southern sedge |
| Carya carolinae-septentrionalis (Ashe) Engl. & Graebn. | southern shagbark hickory |
| Acer floridanum (Chapm.) Pax | southern sugar maple |
| Listera australis Lindl. | southern twayblade |
| Najas guadalupensis (Spreng.) Magnus | southern waternymph |
| Carex glaucescens Elliott | southern waxy sedge |
| Viola hirsutula Brainerd | southern woodland violet |
| Lysimachia tonsa (Alph. Wood) Alph. Wood ex Pax & R. Knuth | southern yellow loosestrife |
| Sonchus L. | sowthistle |
| Glycine Willd. | soybean |
| Tillandsia usneoides (L.) L. | Spanish moss |
| Bidens bipinnata L. | Spanish needles |
| Botrychium biternatum (Sav.) Underw. | sparselobe grapefern |
| Atriplex patula L. | spear saltbush |
| Piptochaetium J. Presl | speargrass |
| Mentha spicata L. | spearmint |
| Alnus incana (L.) Moench ssp. rugosa (Du Roi) R.T. Clausen | speckled alder |
| Veronica L. | speedwell |
| Sphagnum L. | sphagnum |
| Lindera Thunb. | spicebush |
| Pteris multifida Poir. | spider brake |
| Cleome L. | spiderflower |
| Boerhavia L. | spiderling |
| Tradescantia L. | spiderwort |
| Trisetum spicatum (L.) K. Richt. | spike trisetum |
| Tragus berteronianus Schult. | spiked bur grass |
| Centaurium spicatum (L.) Fritsch | spiked centaury |
| Hexalectris spicata (Walter) Barnhart | spiked crested coralroot |
| Tephrosia spicata (Walter) Torr. & A. Gray | spiked hoarypea |
| Muhlenbergia glomerata (Willd.) Trin. | spiked muhly |
| Baptisia albescens Small | spiked wild indigo |
| Selaginella P. Beauv. | spikemoss |
| Aralia L. | spikenard |
| Eleocharis R. Br. | spikerush |
| Kyllinga Rottb. | spikesedge |
| Spinacia L. | spinach |
| Ludwigia hirtella Raf. | spindleroot |
| Euonymus L. | spindletree |
| Ceratophyllum echinatum A. Gray | spineless hornwort |
| Dryopteris carthusiana (Vill.) H.P. Fuchs | spinulose woodfern |
| Amaranthus spinosus L. | spiny amaranth |
| Xanthium spinosum L. | spiny cocklebur |
| Najas marina L. | spiny naiad |
| Carduus acanthoides L. | spiny plumeless thistle |
| Sonchus asper (L.) Hill | spiny sowthistle |
| Potamogeton spirillus Tuck. | spiral pondweed |
| Spiraea L. | spirea |
| Asplenium L. | spleenwort |
| Andropogon ternarius Michx. | splitbeard bluestem |
| Galeopsis bifida Boenn. | splitlip hempnettle |
| Luffa aegyptiaca Mill. | sponge gourd |
| Limnobium Rich. | spongeplant |
| Gamochaeta purpurea (L.) Cabrera | spoonleaf purple everlasting |
| Drosera intermedia Hayne | spoonleaf sundew |
| Marshallia obovata (Walter) Beadle & F.E. Boynt. | spoonshape Barbara’s buttons |
| Monarda punctata L. | spotted beebalm |
| Geranium maculatum L. | spotted geranium |
| Lamium maculatum L. | spotted henbit |
| Eutrochium maculatum (L.) E.E. Lamont | spotted joe pye weed |
| Centaurea stoebe L. | spotted knapweed |
| Polygonum persicaria L. | spotted ladysthumb |
| Medicago arabica (L.) Huds. | spotted medick |
| Potamogeton pulcher Tuck. | spotted pondweed |
| Chamaesyce maculata (L.) Small | spotted sandmat |
| Impatiens balsamina L. | spotted snapweed |
| Hypericum punctatum Lam. | spotted St. Johnswort |
| Cicuta maculata L. | spotted water hemlock |
| Leptochloa P. Beauv. | sprangletop |
| Tephrosia hispidula (Michx.) Pers. | sprawling hoarypea |
| Scirpus divaricatus Elliott | spreading bulrush |
| Chaerophyllum procumbens (L.) Crantz | spreading chervil |
| Apocynum androsaemifolium L. | spreading dogbane |
| Crataegus disperma Ashe | spreading hawthorn |
| Torilis arvensis (Huds.) Link | spreading hedgeparsley |
| Parietaria judaica L. | spreading pellitory |
| Arabis patens Sull. | spreading rockcress |
| Chamaesyce humistrata (Engelm. ex A. Gray) Small | spreading sandmat |
| Arenaria lanuginosa (Michx.) Rohrb. | spreading sandwort |
| Carex laxiculmis Schwein. | spreading sedge |
| Erysimum repandum L. | spreading wallflower |
| Geum vernum (Raf.) Torr. & A. Gray | spring avens |
| Collinsia verna Nutt. | spring blue eyed Mary |
| Corallorhiza wisteriana Conrad | spring coralroot |
| Draba verna L. | spring draba |
| Myosotis verna Nutt. | spring forget-me-not |
| Spiranthes vernalis Engelm. & A. Gray | spring lady’s tresses |
| Vicia lathyroides L. | spring vetch |
| Claytonia L. | springbeauty |
| Tristagma Poepp. | springstar |
| Rubus scambens L.H. Bailey | springtime dewberry |
| Picea A. Dietr. | spruce |
| Euphorbia L. | spurge |
| Centrosema virginianum (L.) Benth. | spurred butterfly pea |
| Spergula L. | spurry |
| Eleocharis quadrangulata (Michx.) Roem. & Schult. | squarestem spikerush |
| Carex squarrosa L. | squarrose sedge |
| Dicentra canadensis (Goldie) Walp. | squirrel corn |
| Vulpia elliotea (Raf.) Fernald | squirreltail fescue |
| Hypericum hypericoides (L.) Crantz | St. Andrew’s cross |
| Ranunculus bulbosus L. | St. Anthony’s turnip |
| Stenotaphrum Trin. | St. Augustine grass |
| Hypericum L. | St. Johnswort |
| Hypericum crux-andreae (L.) Crantz | St. Peterswort |
| Lyonia Nutt. | staggerbush |
| Stachys arvensis (L.) L. | staggerweed |
| Rhus typhina L. | staghorn sumac |
| Carex stipata Muhl. ex Willd. var. maxima Chapm. | stalkgrain sedge |
| Rorippa sessiliflora (Nutt.) Hitchc. | stalkless yellowcress |
| Ipomopsis rubra (L.) Wherry | standing-cypress |
| Lonicera standishii Jacques | Standish’s honeysuckle |
| Chenopodium standleyanum Aellen | Standley’s goosefoot |
| Stellaria pubera Michx. | star chickweed |
| Lemna trisulca L. | star duckweed |
| Ornithogalum L. | star of Bethlehem |
| Carex echinata Murray | star sedge |
| Coreopsis pubescens Elliott | star tickseed |
| Acanthospermum Schrank | starbur |
| Muscari neglectum Guss. ex Ten. | starch grape hyacinth |
| Trientalis L. | starflower |
| Hypoxis L. | star-grass |
| Rhynchospora colorata (L.) H. Pfeiffer | starrush whitetop |
| Maianthemum stellatum (L.) Link | starry false lily of the valley |
| Silphium asteriscus L. | starry rosinweed |
| Dichanthelium depauperatum (Muhl.) Gould | starved panicgrass |
| Stellaria L. | starwort |
| Rubus steelei L.H. Bailey | Steele’s dewberry |
| Eutrochium steelei (E.E. Lamont) E.E. Lamont | Steele’s eupatorium |
| Spiraea tomentosa L. | steeplebush |
| Carex albicans Willd. ex Spreng. var. australis (L.H. Bailey) J. Rettig | stellate sedge |
| Oenothera triloba Nutt. | stemless evening primrose |
| Stephanandra Siebold & Zucc. | stephanandra |
| Stewartia L. | stewartia |
| Hackelia Opiz | stickseed |
| Silene caroliniana Walter | sticky catchfly |
| Cerastium glomeratum Thuill. | sticky chickweed |
| Solanum sisymbriifolium Lam. | sticky nightshade |
| Triantha glutinosa (Michx.) Baker | sticky tofieldia |
| Galium aparine L. | stickywilly |
| Lycopodium annotinum L. | stiff clubmoss |
| Oxypolis rigidior (L.) Raf. | stiff cowbane |
| Cornus foemina Mill. | stiff dogwood |
| Oligoneuron rigidum (L.) Small | stiff goldenrod |
| Galium tinctorium (L.) Scop. | stiff marsh bedstraw |
| Helianthus pauciflorus Nutt. | stiff sunflower |
| Desmodium obtusum (Muhl. ex Willd.) DC. | stiff ticktrefoil |
| Linum medium (Planch.) Britton | stiff yellow flax |
| Urtica dioica L. | stinging nettle |
| Eragrostis cilianensis (All.) Vign. ex Janchen | stinkgrass |
| Pluchea foetida (L.) DC. | stinking camphorweed |
| Anthemis cotula L. | stinking chamomile |
| Stipulicida Michx. | stipulicida |
| Minuartia L. | stitchwort |
| Crataegus iracunda Beadle | stolonbearing hawthorn |
| Hylotelephium H. Ohba | stonecrop |
| Collinsonia verticillata Baldw. | stoneroot |
| Lithospermum L. | stoneseed |
| Erodium L’Hér. ex Aiton | stork’s bill |
| Solidago squarrosa Nutt. | stout goldenrod |
| Polygonum robustius (Small) Fernald | stout smartweed |
| Fragaria L. | strawberry |
| Rubus illecebrosus Focke | strawberry raspberry |
| Physalis grisea (Waterf.) M. Martínez | strawberry-tomato |
| Cyperus strigosus L. | strawcolored flatsedge |
| Mayaca fluviatilis Aubl. | stream bogmoss |
| Cardamine micranthera Rollins | streambank bittercress |
| Philadelphus hirsutus Nutt. | streambank mock orange |
| Iliamna rivularis (Douglas ex Hook.) Greene | streambank wild hollyhock |
| Sisyrinchium montanum Greene | strict blue-eyed grass |
| Myosotis stricta Link ex Roem. & Schult. | strict forget-me-not |
| Sedum sarmentosum Bunge | stringy stonecrop |
| Utricularia striata Leconte ex Torr. | striped bladderwort |
| Viola striata Aiton | striped cream violet |
| Gentiana villosa L. | striped gentian |
| Acer pensylvanicum L. | striped maple |
| Chimaphila maculata (L.) Pursh | striped prince’s pine |
| Isoetes valida (Engelm.) Clute | strong quillwort |
| Bolboschoenus robustus (Pursh) Soják | sturdy bulrush |
| Stylodon Raf. | stylodon |
| Stylophorum Nutt. | stylophorum |
| Athyrium filix-femina (L.) Roth ssp. angustum (Willd.) R.T. Clausen | subarctic ladyfern |
| Trifolium dubium Sibth. | suckling clover |
| Sorghum bicolor (L.) Moench ssp. drummondii (Nees ex Steud.) de Wet & Harlan | Sudangrass |
| Acer saccharum Marshall | sugar maple |
| Isoetes saccharata Engelm. | sugar quillwort |
| Celtis laevigata Willd. | sugarberry |
| Saccharum L. | sugarcane |
| Saccharum giganteum (Walter) Pers. | sugarcane plumegrass |
| Sullivantia sullivantii (Torr. & A. Gray) Britton | Sullivant’s coolwort |
| Potentilla recta L. | sulphur cinquefoil |
| Cosmos sulphureus Cav. | sulphur cosmos |
| Rhus L. | sumac |
| Corallorhiza maculata (Raf.) Raf. | summer coralroot |
| Vitis aestivalis Michx. | summer grape |
| Satureja hortensis L. | summer savory |
| Carex aestivalis M.A. Curtis ex A. Gray | summer sedge |
| Leucojum aestivum L. | summer snowflake |
| Drosera L. | sundew |
| Lupinus perennis L. | sundial lupine |
| Rudbeckia heliopsidis Torr. & A. Gray | sunfacing coneflower |
| Helianthus L. | sunflower |
| Berchemia Neck. ex DC. | supplejack |
| Cynanchum L. | swallow-wort |
| Rhododendron viscosum (L.) Torr. | swamp azalea |
| Persea palustris (Raf.) Sarg. | swamp bay |
| Quercus michauxii Nutt. | swamp chestnut oak |
| Populus heterophylla L. | swamp cottonwood |
| Rumex verticillatus L. | swamp dock |
| Eubotrys racemosus (L.) Nutt. | swamp doghobble |
| Mitreola sessilifolia (J.F. Gmel.) G. Don | swamp hornpod |
| Clematis crispa L. | swamp leather flower |
| Decodon verticillatus (L.) Elliott | swamp loosestrife |
| Pedicularis lanceolata Michx. | swamp lousewort |
| Asclepias incarnata L. | swamp milkweed |
| Rosa palustris Marshall | swamp rose |
| Cladium mariscus (L.) Pohl | swamp sawgrass |
| Polygonum hydropiperoides Michx. | swamp smartweed |
| Helianthus angustifolius L. | swamp sunflower |
| Cirsium muticum Michx. | swamp thistle |
| Cyrilla racemiflora L. | swamp titi |
| Nyssa biflora Walter | swamp tupelo |
| Verbena hastata L. | swamp verbena |
| Sphenopholis pensylvanica (L.) Hitchc. | swamp wedgescale |
| Quercus bicolor Willd. | swamp white oak |
| Sarcocornia A.J. Scott | swampfire |
| Helonias bullata L. | swamppink |
| Hygrophila R. Br. | swampweed |
| Carex swanii (Fernald) Mack. | Swan’s sedge |
| Schoenoplectus subterminalis (Torr.) Soják | swaying bulrush |
| Lobularia maritima (L.) Desv. | sweet alyssum |
| Clematis terniflora DC. | sweet autumn virginsbower |
| Ocimum basilicum L. | sweet basil |
| Betula lenta L. | sweet birch |
| Lonicera fragrantissima Lindl. & Paxton | sweet breath of spring |
| Prunus avium (L.) L. | sweet cherry |
| Malus coronaria (L.) Mill. | sweet crab apple |
| Foeniculum vulgare Mill. | sweet fennel |
| Comptonia L’Hér. ex Aiton | sweet fern |
| Philadelphus coronarius L. | sweet mock orange |
| Sarracenia rubra Walter | sweet pitcherplant |
| Artemisia annua L. | sweet sagewort |
| Brachiaria eruciformis (Sm.) Griseb. | sweet signalgrass |
| Anthoxanthum odoratum L. | sweet vernalgrass |
| Viola odorata L. | sweet violet |
| Trillium vaseyi Harbison | sweet wakerobin |
| Viola blanda Willd. | sweet white violet |
| Silene armeria L. | sweet William silene |
| Cinna arundinacea L. | sweet woodreed |
| Magnolia virginiana L. | sweetbay |
| Rosa rubiginosa L. | sweetbriar rose |
| Melilotus Mill. | sweetclover |
| Acorus L. | sweetflag |
| Hierochloe R. Br. | sweetgrass |
| Liquidambar L. | sweetgum |
| Symplocos Jacq. | sweetleaf |
| Lathyrus odoratus L. | sweetpea |
| Clethra L. | sweetpepperbush |
| Ipomoea batatas (L.) Lam. | sweetpotato |
| Osmorhiza Raf. | sweetroot |
| Pluchea odorata (L.) Cass. | sweetscent |
| Galium odoratum (L.) Scop. | sweetscented bedstraw |
| Eutrochium purpureum (L.) E.E. Lamont | sweetscented joe pye weed |
| Calycanthus L. | sweetshrub |
| Itea L. | sweetspire |
| Dianthus barbatus L. | sweetwilliam |
| Coronopus Zinn | swinecress |
| Arundinaria tecta (Walter) Muhl. | switchcane |
| Panicum virgatum L. | switchgrass |
| Utricularia inflata Walter | swollen bladderwort |
| Phlox buckleyi Wherry | swordleaf phlox |
| Platanus L. | sycamore |
| Synandra Nutt. | synandra |
| Pinus pungens Lamb. | Table Mountain pine |
| Taenidia (Torr. & A. Gray) Drude | taenidia |
| Marshallia legrandii Weakley | Tall Barbara’s buttons |
| Liatris aspera Michx. | tall blazing star |
| Lactuca biennis (Moench) Fernald | tall blue lettuce |
| Ranunculus acris L. | tall buttercup |
| Potentilla arguta Pursh | tall cinquefoil |
| Youngia thunbergiana DC. | tall false hawksbeard |
| Schedonorus arundinaceus (Schreb.) Dumort., nom. cons. | tall fescue |
| Agrimonia gryposepala Wallr. | tall hairy agrimony |
| Hieracium piloselloides Vill. | tall hawkweed |
| Rhynchospora macrostachya Torr. ex A. Gray | tall horned beaksedge |
| Delphinium exaltatum Aiton | tall larkspur |
| Lespedeza stuevei Nutt. | tall lespedeza |
| Ipomoea purpurea (L.) Roth | tall morning-glory |
| Arrhenatherum elatius (L.) P. Beauv. ex J. Presl & C. Presl | tall oatgrass |
| Prenanthes altissima L. | tall rattlesnakeroot |
| Anemone virginiana L. | tall thimbleweed |
| Cirsium altissimum (L.) Hill | tall thistle |
| Eupatorium altissimum L. | tall thoroughwort |
| Coreopsis tripteris L. | tall tickseed |
| Sisymbrium altissimum L. | tall tumblemustard |
| Xyris platylepis Chapm. | tall yelloweyed grass |
| Tamarix L. | tamarisk |
| Rubus plexus Fernald | tangled dewberry |
| Tanacetum L. | tansy |
| Descurainia Webb & Bethel. | tansymustard |
| Dichanthelium acuminatum (Sw.) Gould & C.A. Clark | tapered rosette grass |
| Lycopus rubellus Moench | taperleaf water horehound |
| Eriochloa acuminata (J. Presl) Kunth | tapertip cupgrass |
| Cyperus acuminatus Torr. & Hook. ex Torr. | tapertip flatsedge |
| Juncus acuminatus Michx. | tapertip rush |
| Carex pigra Naczi | Tarheel sedge |
| Muscari comosum (L.) Mill. | tassel grape hyacinth |
| Aster tataricus L. f. | Tatarian aster |
| Lonicera tatarica L. | Tatarian honeysuckle |
| Eriophorum virginicum L. | tawny cottongrass |
| Isoetes ×carltaylorii Musselman [acadiensis × engelmannii] | Taylor’s quillwort |
| Eragrostis hypnoides (Lam.) Britton, Sterns & Poggenb. | teal lovegrass |
| Dipsacus L. | teasel |
| Eriocaulon decangulare L. | tenangle pipewort |
| Agalinis obtusifolia Raf. | tenlobe false foxglove |
| Cystopteris tennesseensis Shaver | Tennessee bladderfern |
| Potamogeton tennesseensis Fernald | Tennessee pondweed |
| Stellaria corei Shinners | Tennessee starwort |
| Anemone berlandieri Pritz. | tenpetal thimbleweed |
| Callitriche terrestris Raf. | terrestrial water-starwort |
| Cyperus polystachyos Rottb. var. texensis (Torr.) Fernald | Texan flatsedge |
| Carex texensis (Torr.) L.H. Bailey | Texas sedge |
| Urochloa texana (Buckley) R. Webster | Texas signalgrass |
| Coreopsis linifolia Nutt. | Texas tickseed |
| Nuttallanthus texanus (Scheele) D.A. Sutton | Texas toadflax |
| Phaseolus polystachios (L.) Britton, Sterns & Poggenb. | thicket bean |
| Carex abscondita Mack. | thicket sedge |
| Phlox carolina L. | thickleaf phlox |
| Paspalum setaceum Michx. | thin paspalum |
| Carex flaccosperma Dewey | thinfruit sedge |
| Symphyotrichum phlogifolium (Muhl. ex Willd.) G.L. Nesom | thinleaf late purple aster |
| Pycnanthemum montanum Michx. | thinleaf mountainmint |
| Helianthus decapetalus L. | thinleaf sunflower |
| Cirsium Mill. | thistle |
| Elaeagnus pungens Thunb. | thorny olive |
| Conoclinium DC. | thoroughwort |
| Sagittaria filiformis J.G. Sm. | threadleaf arrowhead |
| Rhynchospora filifolia A. Gray | threadleaf beaksedge |
| Ranunculus trichophyllus Chaix | threadleaf crowfoot |
| Oenothera linifolia Nutt. | threadleaf evening primrose |
| Agalinis setacea (J.F. Gmel.) Raf. | threadleaf false foxglove |
| Eleocharis tricostata Torr. | three-angle spikerush |
| Aristida L. | threeawn |
| Aegilops neglecta Req. ex Bertol. | three-awned goatgrass |
| Triphora trianthophora (Sw.) Rydb. | threebirds |
| Melica nitens (Scribn.) Nutt. ex Piper | threeflower melicgrass |
| Coptis trifolia (L.) Salisb. | threeleaf goldthread |
| Bidens tripartita L. | threelobe beggarticks |
| Viola triloba Schwein. | three-lobe violet |
| Galium trifidum L. | threepetal bedstraw |
| Triglochin striata Ruiz & Pav. | three-rib arrowgrass |
| Carex trisperma Dewey | threeseeded sedge |
| Eleusine tristachya (Lam.) Lam. | threespike goosegrass |
| Dulichium arundinaceum (L.) Britton | three-way sedge |
| Lespedeza thunbergii (DC.) Nakai | Thunberg’s lespedeza |
| Thymus L. | thyme |
| Houstonia serpyllifolia Michx. | thymeleaf bluet |
| Lechea minor L. | thymeleaf pinweed |
| Arenaria serpyllifolia L. | thymeleaf sandwort |
| Veronica serpyllifolia L. | thymeleaf speedwell |
| Coreopsis L. | tickseed |
| Desmodium Desv. | ticktrefoil |
| Amaranthus cannabinus (L.) Sauer | tidalmarsh amaranth |
| Lilium lancifolium Thunb. | tiger lily |
| Phleum L. | timothy |
| Euphorbia commutata Engelm. ex A. Gray | tinted woodland spurge |
| Houstonia pusilla Schoepf | tiny bluet |
| Myosurus minimus L. | tiny mousetail |
| Lathyrus pusillus Elliott | tiny pea |
| Vicia hirsuta (L.) Gray | tiny vetch |
| Tipularia Nutt. | tipularia |
| Cyrilla Garden ex L. | titi |
| Juncus bufonius L. | toad rush |
| Linaria Mill. | toadflax |
| Trillium sessile L. | toadshade |
| Nicotiana L. | tobacco |
| Ctenium Panzer | toothache grass |
| Cyperus dentatus Torr. | toothed flatsedge |
| Euphorbia dentata Michx. | toothed spurge |
| Sericocarpus asteroides (L.) Britton, Sterns & Poggenb. | toothed whitetop aster |
| Stillingia Garden ex L. | toothleaf |
| Malus toringo (Siebold) Siebold ex de Vriese | toringo crab |
| Rhynchospora torreyana A. Gray | Torrey’s beaksedge |
| Schoenoplectus torreyi (Olney) Palla | Torrey’s bulrush |
| Pycnanthemum torrei Benth. | Torrey’s mountainmint |
| Juncus torreyi Coville | Torrey’s rush |
| Impatiens L. | touch-me-not |
| Arabis glabra (L.) Bernh. | tower rockcress |
| Trachelospermum Lem. | trachelospermum |
| Epigaea L. | trailing arbutus |
| Lespedeza procumbens Michx. | trailing lespedeza |
| Sagina decumbens (Elliott) Torr. & A. Gray | trailing pearlwort |
| Phlox nivalis Lodd. ex Sweet | trailing phlox |
| Aconitum reclinatum A. Gray | trailing white monkshood |
| Lysimachia radicans Hook. | trailing yellow loosestrife |
| Facelis Cass. | trampweed |
| Rubus probabilis L.H. Bailey | tree blackberry |
| Lycopodium dendroideum Michx. | tree groundpine |
| Ailanthus altissima (Mill.) Swingle | tree of heaven |
| Lotus L. | trefoil |
| Atriplex prostrata Bouchér ex DC. | triangle orache |
| Trianthema L. | trianthema |
| Trichostomum Bruch | trichostomum moss |
| Tridens Roem. & Schult. | tridens |
| Trillium L. | trillium |
| Hyptis mutabilis (A. Rich.) Briq. | tropical bushmint |
| Richardia brasiliensis Gomes | tropical Mexican clover |
| Bacopa innominata (G. Maza) Alain | tropical waterhyssop |
| Carex molesta Mack. ex Bright | troublesome sedge |
| Myosotis scorpioides L. | true forget-me-not |
| Campsis radicans (L.) Seem. ex Bureau | trumpet creeper |
| Lonicera sempervirens L. | trumpet honeysuckle |
| Gelsemium Juss. | trumpetflower |
| Eutrochium fistulosum (Barratt) E.E. Lamont | trumpetweed |
| Manfreda Salisb. | tuberose |
| Calopogon tuberosus (L.) Britton, Sterns & Poggenb. | tuberous grasspink |
| Lithospermum tuberosum Rugel ex DC. | tuberous stoneseed |
| Verbena rigida Spreng. | tuberous vervain |
| Deschampsia cespitosa (L.) P. Beauv. | tufted hairgrass |
| Eragrostis pectinacea (Michx.) Nees ex Steud. | tufted lovegrass |
| Liriodendron L. | tuliptree |
| Chloris verticillata Nutt. | tumble windmill grass |
| Atriplex rosea L. | tumbling saltweed |
| Nyssa L. | tupelo |
| Liatris turgida Gaiser | turgid blazing star |
| Dicentra eximia (Ker Gawl.) Torr. | turkey corn |
| Quercus laevis Walter | turkey oak |
| Phyla nodiflora (L.) Greene | turkey tangle fogfruit |
| Bunias orientalis L. | Turkish wartycabbage |
| Lilium superbum L. | turk’s-cap lily |
| Chelone L. | turtlehead |
| Listera R. Br. | twayblade |
| Bartonia paniculata (Michx.) Muhl. | twining screwstem |
| Rhynchosia tomentosa (L.) Hook. & Arn. | twining snoutbean |
| Jeffersonia diphylla (L.) Pers. | twinleaf |
| Diplazium Sw. | twinsorus fern |
| Carex torta Boott ex Tuck. | twisted sedge |
| Eleocharis tortilis (Link) Schult. | twisted spikerush |
| Streptopus Michx. | twistedstalk |
| Solidago tortifolia Elliott | twistleaf goldenrod |
| Krigia biflora (Walter) S.F. Blake | twoflower dwarfdandelion |
| Melica mutica Walter | twoflower melicgrass |
| Crotalaria biflora L. | twoflower rattlebox |
| Callitriche heterophylla Pursh | twoheaded water-starwort |
| Mitella diphylla L. | twoleaf miterwort |
| Myriophyllum heterophyllum Michx. | twoleaf watermilfoil |
| Centaurea nigrescens Willd. | Tyrol knapweed |
| Cyperus diandrus Torr. | umbrella flatsedge |
| Diphylleia Michx. | umbrellaleaf |
| Fuirena Rottb. | umbrella-sedge |
| Magnolia tripetala (L.) L. | umbrella-tree |
| Proboscidea Schmidel | unicorn-plant |
| Agrostis perennans (Walter) Tuck. | upland bentgrass |
| Rubus pergratus Blanch. | upland blackberry |
| Eupatorium sessilifolium L. | upland boneset |
| Cystopteris tenuis (Michx.) Desv. | upland brittle bladderfern |
| Gossypium hirsutum L. | upland cotton |
| Rubus invisus (L.H. Bailey) Britton | upland dewberry |
| Vaccinium simulatum Small | upland highbush blueberry |
| Smilax ecirrhata (Engelm. ex Kunth) S. Watson | upright carrionflower |
| Carex stricta Lam. | upright sedge |
| Cortaderia selloana (Schult. & Schult. f.) Asch. & Graebn. | Uruguayan pampas grass |
| Lemna valdiviana Phil. | valdivia duckweed |
| Valeriana L. | valerian |
| Ammannia coccinea Rottb. | valley redstem |
| Cyperus difformis L. | variable flatsedge |
| Dichanthelium commutatum (Schult.) Gould | variable panicgrass |
| Carex polymorpha Muhl. | variable sedge |
| Hexastylis heterophylla (Ashe) Small | variableleaf heartleaf |
| Festuca heterophylla Lam. | variousleaf fescue |
| Clematis viorna L. | vasevine |
| Paspalum urvillei Steud. | Vasey’s grass |
| Lathyrus venosus Muhl. ex Willd. | veiny pea |
| Scutellaria nervosa Pursh | veiny skullcap |
| Dichanthelium scoparium (Lam.) Gould | velvet panicum |
| Carex vestita Willd. | velvet sedge |
| Holcus L. | velvetgrass |
| Abutilon theophrasti Medik. | velvetleaf |
| Vaccinium myrtilloides Michx. | velvetleaf huckleberry |
| Desmodium viridiflorum (L.) DC. | velvetleaf ticktrefoil |
| Oenothera curtiflora W.L. Wagner & Hoch | velvetweed |
| Croton glandulosus L. | vente conmigo |
| Triodanis Raf. ex Greene | Venus’ looking-glass |
| Houstonia purpurea L. | Venus’ pride |
| Callitriche palustris L. | vernal water-starwort |
| Veronicastrum Heist. ex Fabr. | veronicastrum |
| Verbena L. | vervain |
| Vicia L. | vetch |
| Viburnum L. | viburnum |
| Viola L. | violet |
| Lespedeza violacea (L.) Pers. | violet lespedeza |
| Oxalis violacea L. | violet woodsorrel |
| Zornia bracteata Walter ex J.F. Gmel. | viperina |
| Echium L. | viper’s bugloss |
| Mertensia virginica (L.) Pers. ex Link | Virginia bluebells |
| Veratrum virginicum (L.) W.T. Aiton | Virginia bunchflower |
| Diodia virginiana L. | Virginia buttonweed |
| Woodwardia virginica (L.) Sm. | Virginia chainfern |
| Parthenocissus quinquefolia (L.) Planch. | Virginia creeper |
| Commelina virginica L. | Virginia dayflower |
| Krigia virginica (L.) Willd. | Virginia dwarfdandelion |
| Sida hermaphrodita (L.) Rusby | Virginia fanpetals |
| Salicornia depressa Standl. | Virginia glasswort |
| Solidago gracillima Torr. & A. Gray | Virginia goldenrod |
| Physalis virginiana Mill. | Virginia groundcherry |
| Hexastylis virginica (L.) Small | Virginia heartleaf |
| Iris virginica L. | Virginia iris |
| Aeschynomene virginica (L.) Britton, Sterns & Poggenb. | Virginia jointvetch |
| Triadenum virginicum (L.) Raf. | Virginia marsh St. Johnswort |
| Spiraea virginiana Britton | Virginia meadowsweet |
| Pycnanthemum virginianum (L.) T. Dur. & B.D. Jacks. ex B.L. Rob. & Fernald | Virginia mountainmint |
| Obolaria virginica L. | Virginia pennywort |
| Lepidium virginicum L. | Virginia pepperweed |
| Pinus virginiana Mill. | Virginia pine |
| Lechea maritima Leggett ex Britton, Sterns & Poggenb. var. virginica Hodgdon | Virginia pinweed |
| Plantago virginica L. | Virginia plantain |
| Isoetes virginica N.E. Pfeiffer | Virginia quillwort |
| Rosa virginiana Mill. | Virginia rose |
| Betula uber (Ashe) Fernald | Virginia roundleaf birch |
| Kosteletzkya virginica (L.) C. Presl ex A. Gray | Virginia saltmarsh mallow |
| Scutellaria ovata Hill ssp. virginiana Epling | Virginia skullcap |
| Aristolochia serpentaria L. | Virginia snakeroot |
| Helenium virginicum S.F. Blake | Virginia sneezeweed |
| Tradescantia virginiana L. | Virginia spiderwort |
| Claytonia virginica L. | Virginia springbeauty |
| Fragaria virginiana Duchesne | Virginia strawberry |
| Itea virginica L. | Virginia sweetspire |
| Tephrosia virginiana (L.) Pers. | Virginia tephrosia |
| Cirsium virginianum (L.) Michx. | Virginia thistle |
| Acalypha virginica L. | Virginia threeseed mercury |
| Trillium pusillum Michx. var. virginianum Fernald | Virginia wakerobin |
| Lycopus virginicus L. | Virginia water horehound |
| Clematis coactilis (Fernald) Keener | Virginia whitehair leather flower |
| Elymus virginicus L. | Virginia wildrye |
| Sibara virginica (L.) Rollins | Virginia winged rockcress |
| Eleocharis vivipara Link | viviparous spikerush |
| Asplenium rhizophyllum L. | walking fern |
| Erysimum L. | wallflower |
| Diplotaxis DC. | wallrocket |
| Asplenium ruta-muraria L. | wallrue |
| Juglans L. | walnut |
| Physalis walteri Nutt. | Walter’s groundcherry |
| Carex striata Michx. | Walter’s sedge |
| Liatris virgata Nutt. | wand blazing star |
| Solidago stricta Aiton | wand goldenrod |
| Lythrum lineare L. | wand lythrum |
| Murdannia keisak (Hassk.) Hand.-Maz. | wartremoving herb |
| Panicum verrucosum Muhl. | warty panicgrass |
| Carex verrucosa Muhl. | warty sedge |
| Euphorbia spathulata Lam. | warty spurge |
| Bunias L. | wartycabbage |
| Crataegus phaenopyrum (L. f.) Medik. | Washington hawthorn |
| Rubus immanis Ashe | Watauga River blackberry |
| Trapa L. | water chestnut |
| Alopecurus geniculatus L. | water foxtail |
| Cicuta L. | water hemlock |
| Carya aquatica (Michx. f.) Nutt. | water hickory |
| Equisetum fluviatile L. | water horsetail |
| Eichhornia Kunth | water hyacinth |
| Polygonum amphibium L. | water knotweed |
| Mentha aquatica L. | water mint |
| Quercus nigra L. | water oak |
| Alisma L. | water plantain |
| Carex aquatilis Wahlenb. | water sedge |
| Polygonum amphibium L. var. stipulaceum Coleman | water smartweed |
| Veronica anagallis-aquatica L. | water speedwell |
| Nyssa aquatica L. | water tupelo |
| Marsilea L. | waterclover |
| Nasturtium officinale W.T. Aiton | watercress |
| Bulbostylis barbata (Rottb.) C.B. Clarke | watergrass |
| Lycopus L. | waterhorehound |
| Bacopa Aubl. | waterhyssop |
| Hydrophyllum L. | waterleaf |
| Nymphaea L. | waterlily |
| Wolffia Horkel ex Schleid. | watermeal |
| Citrullus Schrad. | watermelon |
| Myriophyllum L. | watermilfoil |
| Salvinia Ség. | watermoss |
| Najas L. | waternymph |
| Sium L. | waterparsnip |
| Ranunculus ambigens S. Watson | waterplantain spearwort |
| Hydrolea quadrivalvis Walter | waterpod |
| Didiplis diandra (Nutt. ex DC.) Alph. Wood | waterpurslane |
| Brasenia schreberi J.F. Gmel. | watershield |
| Callitriche L. | water-starwort |
| Potamogeton diversifolius Raf. | waterthread pondweed |
| Hydrilla verticillata (L. f.) Royle | waterthyme |
| Elodea Michx. | waterweed |
| Justicia L. | water-willow |
| Elatine L. | waterwort |
| Deschampsia flexuosa (L.) Trin. | wavy hairgrass |
| Symphyotrichum undulatum (L.) G.L. Nesom | wavyleaf aster |
| Tragia urens L. | wavyleaf noseburn |
| Echinacea simulata R.L. McGregor | wavyleaf purple coneflower |
| Morella cerifera (L.) Small | wax myrtle |
| Pyrola elliptica Nutt. | waxflower shinleaf |
| Cuphea P. Br. | waxweed |
| Eupatorium glaucescens Elliott | waxy thoroughwort |
| Crataegus pruinosa (Wendl. f.) K. Koch | waxyfruit hawthorn |
| Thalictrum revolutum DC. | waxyleaf meadow-rue |
| Ligustrum quihoui Carrière | waxyleaf privet |
| Viburnum lantana L. | wayfaringtree |
| Juncus debilis A. Gray | weak rush |
| Carex seorsa Howe | weak stellate sedge |
| Yucca flaccida Haw. | weak-leaf yucca |
| Schoenoplectiella purshiana (Fernald) Lye | weakstalk bulrush |
| Sagittaria graminea Michx. var. weatherbiana (Fernald) Bogin | Weatherby’s arrowhead |
| Sphenopholis Scribn. | wedgescale |
| Krigia caespitosa (Raf.) K.L. Chambers | weedy dwarfdandelion |
| Puccinellia distans (Jacq.) Parl. | weeping alkaligrass |
| Forsythia suspensa (Thunb.) Vahl | weeping forsythia |
| Eragrostis curvula (Schrad.) Nees | weeping lovegrass |
| Salix babylonica L. | Weeping willow |
| Trichomanes intricatum Farrar | weft fern |
| Limosella australis R. Br. | Welsh mudwort |
| Solanum ptycanthum Dunal | West Indian nightshade |
| Clematis occidentalis (Hornem.) DC. | western blue virginsbower |
| Pteridium aquilinum (L.) Kuhn | western brackenfern |
| Teucrium canadense L. var. occidentale (A. Gray) E.M. McClint. & Epling | western germander |
| Onosmodium bejariense DC. ex A. DC. var. occidentale (Mack.) B.L. Turner | western marbleseed |
| Dichanthelium acuminatum (Sw.) Gould & C.A. Clark var. fasciculatum (Torr.) Freckmann | western panicgrass |
| Anaphalis margaritacea (L.) Benth. | western pearly everlasting |
| Toxicodendron rydbergii (Small ex Rydb.) Greene | western poison ivy |
| Solidago radula Nutt. | western rough goldenrod |
| Descurainia pinnata (Walter) Britton | western tansymustard |
| Elodea nuttallii (Planch.) H. St. John | western waterweed |
| Achillea millefolium L. var. occidentalis DC. | western yarrow |
| Triticum L. | wheat |
| Carex atherodes Spreng. | wheat sedge |
| Scleria triglomerata Michx. | whip nutrush |
| Trillium cernuum L. | whip-poor-will flower |
| Heuchera alba Rydb. | white alumroot |
| Peltandra sagittifolia (Michx.) Morong | white arrow arum |
| Symphyotrichum urophyllum (Lindl.) G.L. Nesom | white arrowleaf aster |
| Fraxinus americana L. | white ash |
| Geum canadense Jacq. | white avens |
| Calepina irregularis (Asso) Thell. | white ballmustard |
| Actaea pachypoda Elliott | white baneberry |
| Rhynchospora alba (L.) Vahl | white beaksedge |
| Carex albursina Sheldon | white bear sedge |
| Monarda clinopodia L. | white bergamot |
| Sisyrinchium albidum Raf. | white blue-eyed grass |
| Clintonia umbellulata (Michx.) Morong | white clintonia |
| Trifolium repens L. | white clover |
| Aletris farinosa L. | white colicroot |
| Verbesina virginica L. | white crownbeard |
| Lamium album L. | white deadnettle |
| Boltonia asteroides (L.) L’Hér. | white doll’s daisy |
| Carex debilis Michx. | white edge sedge |
| Erythronium albidum Nutt. | white fawnlily |
| Platanthera blephariglottis (Willd.) Lindl. | white fringed orchid |
| Platanthera integrilabia (Correll) Luer | white fringeless orchid |
| Chionanthus virginicus L. | white fringetree |
| Solidago bicolor L. | white goldenrod |
| Symphyotrichum ericoides (L.) G.L. Nesom | white heath aster |
| Cypripedium candidum Muhl. ex Willd. | white lady’s slipper |
| Spiraea alba Du Roi | white meadowsweet |
| Alysicarpus vaginalis (L.) DC. | white moneywort |
| Morus alba L. | white mulberry |
| Verbascum lychnitis L. | white mullein |
| Quercus alba L. | white oak |
| Symphyotrichum lanceolatum (Willd.) G.L. Nesom | white panicle aster |
| Populus alba L. | white poplar |
| Prenanthes alba L. | white rattlesnakeroot |
| Artemisia ludoviciana Nutt. | white sagebrush |
| Bartonia verna (Michx.) Raf. ex Barton | white screwstem |
| Ageratina altissima (L.) R.M. King & H. Rob. | white snakeroot |
| Eleocharis albida Torr. | white spikerush |
| Eupatorium album L. | white thoroughwort |
| Trillium grandiflorum (Michx.) Salisb. | white trillium |
| Chelone glabra L. | white turtlehead |
| Verbena urticifolia L. | white vervain |
| Baptisia alba (L.) Vent. | white wild indigo |
| Salix alba L. | white willow |
| Eurybia divaricata (L.) G.L. Nesom | white wood aster |
| Cyperus flavicomus Michx. | whiteedge flatsedge |
| Ipomoea nil (L.) Roth | whiteedge morning-glory |
| Polymnia canadensis L. | whiteflower leafcup |
| Leersia virginica Willd. | whitegrass |
| Clematis albicoma Wherry | whitehair leather flower |
| Dichanthelium villosissimum (Nash) Freckmann | whitehair rosette grass |
| Lachnocaulon anceps (Walter) Morong | whitehead bogbutton |
| Clematis glaucophylla Small | whiteleaf leather flower |
| Commelina erecta L. | whitemouth dayflower |
| Juncus brachycarpus Engelm. | whiteroot rush |
| Ipomoea lacunosa L. | whitestar |
| Ipomoea ×leucantha Jacq. (pro sp.) [cordatotriloba × lacunosa] | whitestar morning-glory |
| Vachellia constricta (Benth.) Seigler & Ebinger | whitethorn acacia |
| Carex albicans Willd. ex Spreng. | whitetinge sedge |
| Cardaria Desv. | whitetop |
| Sericocarpus Greene | whitetop aster |
| Hydrocotyle prolifera Kellogg | whorled marshpennywort |
| Asclepias verticillata L. | whorled milkweed |
| Polygala ambigua Nutt. | whorled milkwort |
| Pycnanthemum verticillatum (Michx.) Pers. | whorled mountainmint |
| Silphium trifoliatum L. | whorled rosinweed |
| Coreopsis verticillata L. | whorled tickseed |
| Oclemena acuminata (Michx.) Greene | whorled wood aster |
| Lysimachia quadrifolia L. | whorled yellow loosestrife |
| Phlox latifolia Michx. | wideflower phlox |
| Liparis Rich. | widelip orchid |
| Ruppia maritima L. | widgeongrass |
| Ruppia L. | widgeonweed |
| Silene stellata (L.) W.T. Aiton | widowsfrill |
| Clinopodium vulgare L. | wild basil |
| Monarda fistulosa L. | wild bergamot |
| Phlox divaricata L. | wild blue phlox |
| Daucus L. | wild carrot |
| Anthriscus sylvestris (L.) Hoffm. | wild chervil |
| Allium schoenoprasum L. | wild chives |
| Salvia verbenaca L. | wild clary |
| Cynoglossum virginianum L. | wild comfrey |
| Echinocystis lobata (Michx.) Torr. & A. Gray | wild cucumber |
| Allium vineale L. | wild garlic |
| Prunus munsoniana W. Wight & Hedrick | wild goose plum |
| Iliamna Greene | wild hollyhock |
| Hydrangea arborescens L. | wild hydrangea |
| Baptisia Vent. | wild indigo |
| Onosmodium virginianum (L.) A. DC. | wild Job’s tears |
| Mentha arvensis L. | wild mint |
| Sinapis arvensis L. ssp. arvensis | wild mustard |
| Avena fatua L. | wild oat |
| Pastinaca sativa L. | wild parsnip |
| Ruellia L. | wild petunia |
| Parthenium auriculatum Britton | wild quinine |
| Raphanus raphanistrum L. | wild radish |
| Aralia nudicaulis L. | wild sarsaparilla |
| Phlox maculata L. | wild sweetwilliam |
| Dioscorea villosa L. | wild yam |
| Asarum L. | wildginger |
| Zizania L. | wildrice |
| Elymus L. | wildrye |
| Carex superata Naczi, Reznicek & B.A. Ford | Willdenow’s sedge |
| Salix L. | willow |
| Quercus phellos L. | willow oak |
| Epilobium L. | willowherb |
| Symphyotrichum praealtum (Poir.) G.L. Nesom | willowleaf aster |
| Lactuca saligna L. | willowleaf lettuce |
| Spiraea salicifolia L. | willowleaf meadowsweet |
| Chloris Sw. | windmill grass |
| Oxalis rubra A. St.-Hil. | windowbox woodsorrel |
| Vitis vinifera L. | wine grape |
| Rubus phoenicolasius Maxim. | wine raspberry |
| Ulmus alata Michx. | winged elm |
| Lythrum alatum Pursh | winged lythrum |
| Cycloloma atriplicifolium (Spreng.) J.M. Coult. | winged pigweed |
| Ludwigia alata Elliott | winged primrose-willow |
| Sibara Greene | winged rockcress |
| Rhus copallinum L. | winged sumac |
| Ludwigia decurrens Walter | wingleaf primrose-willow |
| Verbesina alternifolia (L.) Britton ex Kearney | wingstem |
| Spergula pentandra L. | wingstem spurry |
| Eranthis hyemalis (L.) Salisb. | winter aconite |
| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | winter bentgrass |
| Euonymus fortunei (Turcz.) Hand.-Maz. | winter creeper |
| Sternbergia Waldst. & Kit. | winter daffodil |
| Cucurbita maxima Duchesne | winter squash |
| Vicia villosa Roth | winter vetch |
| Pyrola L. | wintergreen |
| Muhlenbergia frondosa (Poir.) Fernald | wirestem muhly |
| Panicum flexile (Gattinger) Scribn. | wiry panicgrass |
| Salix ×pendulina Wender. [babylonica × euxina] | Wisconsin weeping willow |
| Wisteria Nutt. | wisteria |
| Panicum capillare L. | witchgrass |
| Hamamelis L. | witchhazel |
| Hylotelephium telephium (L.) H. Ohba | witch’s moneybags |
| Viburnum nudum L. var. cassinoides (L.) Torr. & A. Gray | withe-rod |
| Isatis L. | woad |
| Poa wolfii Scribn. | Wolf’s bluegrass |
| Antennaria plantaginifolia (L.) Richardson | woman’s tobacco |
| Anemone quinquefolia L. | wood anemone |
| Poa nemoralis L. | wood bluegrass |
| Lilium philadelphicum L. | wood lily |
| Parthenocissus vitacea (Knerr) Hitchc. | woodbine |
| Dryopteris Adans. | woodfern |
| Cardamine flexuosa With. | woodland bittercress |
| Poa sylvestris A. Gray | woodland bluegrass |
| Scirpus expansus Fernald | woodland bulrush |
| Arctium vulgare (Hill) Evans | woodland burdock |
| Calamintha sylvatica Bromf. | woodland calamint |
| Rubus felix L.H. Bailey | woodland dewberry |
| Linum virginianum L. | woodland flax |
| Equisetum sylvaticum L. | woodland horsetail |
| Lactuca floridana (L.) Gaertn. | woodland lettuce |
| Muhlenbergia sylvatica (Torr.) Torr. ex A. Gray | woodland muhly |
| Spigelia marilandica (L.) L. | woodland pinkroot |
| Juncus subcaudatus (Engelm.) Coville & S.F. Blake | woodland rush |
| Sedum ternatum Michx. | woodland stonecrop |
| Fragaria vesca L. | woodland strawberry |
| Helianthus divaricatus L. | woodland sunflower |
| Chasmanthium Link | woodoats |
| Cinna L. | woodreed |
| Luzula DC. | woodrush |
| Oxalis L. | woodsorrel |
| Decumaria barbara L. | woodvamp |
| Scirpus cyperinus (L.) Kunth | woolgrass |
| Hudsonia tomentosa Nutt. | woolly beachheather |
| Carphephorus tomentosus (Michx.) Torr. & A. Gray | woolly chaffhead |
| Stachys byzantina K. Koch | woolly hedgenettle |
| Cheilanthes tomentosa Link | woolly lipfern |
| Plantago patagonica Jacq. | woolly plantain |
| Packera tomentosa (Michx.) C. Jeffrey | woolly ragwort |
| Dichanthelium scabriusculum (Elliott) Gould & C.A. Clark | woolly rosette grass |
| Carex pellita Muhl. ex Willd. | woolly sedge |
| Carex lasiocarpa Ehrh. | woollyfruit sedge |
| Aristida lanosa Muhl. ex Elliott | woollysheath threeawn |
| Dysphania anthelmintica (L.) Mosyakin & Clemants | wormseed |
| Chamaesyce vermiculata (Raf.) House | wormseed sandmat |
| Erysimum cheiranthoides L. | wormseed wallflower |
| Solidago caesia L. | wreath goldenrod |
| Rhynchospora wrightiana Boeckeler | Wright’s beaksedge |
| Ipomoea wrightii A. Gray | Wright’s morning-glory |
| Plantago wrightiana Decne. | Wright’s plantain |
| Dichanthelium wrightianum (Scribn.) Freckmann | Wright’s rosette grass |
| Eleocharis diandra C. Wright | Wright’s spikerush |
| Hypoxis wrightii (Baker) Brackett | Wright’s star-grass |
| Coelorachis rugosa (Nutt.) Nash | wrinkled jointtail grass |
| Solidago rugosa Mill. | wrinkleleaf goldenrod |
| Ulmus glabra Huds. | Wych elm |
| Dioscorea L. | yam |
| Rubus frondosus Bigelow | yankee blackberry |
| Eupatorium compositifolium Walter | yankeeweed |
| Achillea L. | yarrow |
| Ilex vomitoria Aiton | yaupon |
| Seymeria cassioides (J.F. Gmel.) S.F. Blake | yaupon blacksenna |
| Medicago sativa L. ssp. falcata (L.) Arcang. | yellow alfalfa |
| Lamiastrum galeobdolon (L.) Ehrend. & Polatschek | yellow archangel |
| Geum aleppicum Jacq. | yellow avens |
| Betula alleghaniensis Britton | yellow birch |
| Aesculus flava Aiton | yellow buckeye |
| Ajuga chamaepitys (L.) Schreb. | yellow bugle |
| Verbesina occidentalis (L.) Walter | yellow crownbeard |
| Hemerocallis lilioasphodelus L. | yellow daylily |
| Prosartes lanuginosa (Michx.) D. Don | yellow fairybells |
| Cyperus flavescens L. | yellow flatsedge |
| Setaria pumila (Poir.) Roem. & Schult. | yellow foxtail |
| Platanthera ciliaris (L.) Lindl. | yellow fringed orchid |
| Corydalis flavula (Raf.) DC. | yellow fumewort |
| Agastache nepetoides (L.) Kuntze | yellow giant hyssop |
| Phyllostachys aureosulcata McClure | yellow groove bamboo |
| Aira praecox L. | yellow hairgrass |
| Glaucium flavum Crantz | yellow hornpoppy |
| Lysimachia L. | yellow loosestrife |
| Prosartes maculata (Buckley) A. Gray | yellow mandarin |
| Caltha palustris L. | yellow marsh marigold |
| Paronychia virginica Spreng. | yellow nailwort |
| Spiranthes ochroleuca (Rydb.) Rydb. | yellow nodding lady’s tresses |
| Cyperus esculentus L. | yellow nutsedge |
| Passiflora lutea L. | yellow passionflower |
| Taenidia integerrima (L.) Drude | yellow pimpernel |
| Sarracenia flava L. | yellow pitcherplant |
| Nuphar lutea (L.) Sm. | yellow pond-lily |
| Tragopogon dubius Scop. | yellow salsify |
| Bartonia virginica (L.) Britton, Sterns & Poggenb. | yellow screwstem |
| Carex flava L. | yellow sedge |
| Eleocharis flavescens (Poir.) Urb. | yellow spikerush |
| Galium verum L. | Yellow Spring bedstraw |
| Centaurea solstitialis L. | yellow star-thistle |
| Cirsium horridulum Michx. | yellow thistle |
| Trillium luteum (Muhl.) Harbison | yellow wakerobin |
| Ranunculus flabellaris Raf. | yellow water buttercup |
| Liparis loeselii (L.) Rich. | yellow widelip orchid |
| Nasturtium R. Br. | yellowcress |
| Xyris L. | yelloweyed grass |
| Triosteum angustifolium L. | yellowfruit horse-gentian |
| Carex annectens (E.P. Bicknell) E.P. Bicknell | yellowfruit sedge |
| Inula L. | yellowhead |
| Crataegus flava Aiton | yellowleaf hawthorn |
| Barbarea W.T. Aiton | yellowrocket |
| Xanthorhiza Marshall | yellowroot |
| Lindernia dubia (L.) Pennell | yellowseed false pimpernel |
| Flaveria Juss. | yellowtops |
| Cladrastis Raf. | yellowwood |
| Taxus L. | yew |
| Youngia Cass. | youngia |
| Yucca L. | yucca |
| Zephyranthes Herb. | zephyrlily |
| Utricularia subulata L. | zigzag bladderwort |
| Solidago flexicaulis L. | zigzag goldenrod |
| Tradescantia subaspera Ker Gawl. | zigzag spiderwort |
| Zizia W.D.J. Koch | zizia |
| Zornia J.F. Gmel. | zornia |
| Chenopodium berlandieri Moq. var. zschackii (Murr) Murr ex Asch. | Zschack’s goosefoot |