List of Maryland Plants
| Plant Name | Scientific Name | Plant CD | Family | Type |
|---|---|---|---|---|
| Aaron"s rod | Thermopsis villosa | THVI | Fabaceae | Dicot |
| Aberdeen dewberry | Rubus depavitus | RUDE8 | Rosaceae | Dicot |
| absinthium | Artemisia absinthium | ARAB3 | Asteraceae | Dicot |
| acacia | Acacia | ACACI | Fabaceae | Dicot |
| acinos | Acinos | ACINO | Lamiaceae | Dicot |
| Adam and Eve | Aplectrum | APLEC | Orchidaceae | Monocot |
| Adam and Eve | Aplectrum hyemale | APHY | Orchidaceae | Monocot |
| Adam"s needle | Yucca filamentosa | YUFI | Agavaceae | Monocot |
| adder"s-mouth orchid | Malaxis | MALAX | Orchidaceae | Monocot |
| adderstongue | Ophioglossum | OPHIO | Ophioglossaceae | Fern |
| Addison"s rosette grass | Dichanthelium ovale var. addisonii | DIOVA | Poaceae | Monocot |
| adlumia | Adlumia | ADLUM | Fumariaceae | Dicot |
| agrimony | Agrimonia | AGRIM | Rosaceae | Dicot |
| agueweed | Gentianella quinquefolia | GEQU2 | Gentianaceae | Dicot |
| agueweed | Gentianella quinquefolia ssp. quinquefolia | GEQUQ | Gentianaceae | Dicot |
| ailanthus | Ailanthus | AILAN | Simaroubaceae | Dicot |
| airplant | Tillandsia | TILLA2 | Bromeliaceae | Monocot |
| Alabama supplejack | Berchemia scandens | BESC | Rhamnaceae | Dicot |
| albizia | Albizia | ALBIZ | Fabaceae | Dicot |
| alder | Alnus | ALNUS | Betulaceae | Dicot |
| alderleaf buckthorn | Rhamnus alnifolia | RHAL | Rhamnaceae | Dicot |
| Aleutian maidenhair | Adiantum aleuticum | ADAL | Pteridaceae | Fern |
| alfalfa | Medicago | MEDIC | Fabaceae | Dicot |
| alfalfa | Medicago sativa | MESA | Fabaceae | Dicot |
| alfalfa | Medicago sativa ssp. sativa | MESAS | Fabaceae | Dicot |
| alkaligrass | Puccinellia | PUCCI | Poaceae | Monocot |
| Allegheny blackberry | Rubus allegheniensis | RUAL | Rosaceae | Dicot |
| Allegheny blackberry | Rubus allegheniensis var. allegheniensis | RUALA | Rosaceae | Dicot |
| Allegheny hawkweed | Hieracium paniculatum | HIPA2 | Asteraceae | Dicot |
| Allegheny monkeyflower | Mimulus ringens | MIRI | Scrophulariaceae | Dicot |
| Allegheny monkeyflower | Mimulus ringens var. ringens | MIRIR | Scrophulariaceae | Dicot |
| Allegheny Mountain buttercup | Ranunculus allegheniensis | RAAL2 | Ranunculaceae | Dicot |
| Allegheny plum | Prunus alleghaniensis | PRAL5 | Rosaceae | Dicot |
| Allegheny plum | Prunus alleghaniensis var. alleghaniensis | PRALA | Rosaceae | Dicot |
| Allegheny serviceberry | Amelanchier laevis | AMLA | Rosaceae | Dicot |
| Allegheny stonecrop | Hylotelephium telephioides | HYTE9 | Crassulaceae | Dicot |
| allegheny vine | Adlumia fungosa | ADFU | Fumariaceae | Dicot |
| alliaria | Alliaria | ALLIA | Brassicaceae | Dicot |
| alpine violet | Viola labradorica | VILA10 | Violaceae | Dicot |
| alsike clover | Trifolium hybridum | TRHY | Fabaceae | Dicot |
| alternateleaf dogwood | Cornus alternifolia | COAL2 | Cornaceae | Dicot |
| alumroot | Heuchera | HEUCH | Saxifragaceae | Dicot |
| amberique-bean | Strophostyles helvola | STHE9 | Fabaceae | Dicot |
| American alumroot | Heuchera americana | HEAM6 | Saxifragaceae | Dicot |
| American alumroot | Heuchera americana var. americana | HEAMA2 | Saxifragaceae | Dicot |
| American alumroot | Heuchera americana var. hispida | HEAMH2 | Saxifragaceae | Dicot |
| American barberry | Berberis canadensis | BECA2 | Berberidaceae | Dicot |
| American basswood | Tilia americana | TIAM | Tiliaceae | Dicot |
| American basswood | Tilia americana var. americana | TIAMA | Tiliaceae | Dicot |
| American basswood | Tilia americana var. heterophylla | TIAMH | Tiliaceae | Dicot |
| American beachgrass | Ammophila breviligulata | AMBR | Poaceae | Monocot |
| American beakgrain | Diarrhena americana | DIAM | Poaceae | Monocot |
| American beautyberry | Callicarpa americana | CAAM2 | Verbenaceae | Dicot |
| American beech | Fagus grandifolia | FAGR | Fagaceae | Dicot |
| American bellflower | Campanulastrum americanum | CAAM18 | Campanulaceae | Dicot |
| American bittercress | Cardamine rotundifolia | CARO3 | Brassicaceae | Dicot |
| American bittersweet | Celastrus scandens | CESC | Celastraceae | Dicot |
| American black currant | Ribes americanum | RIAM2 | Grossulariaceae | Dicot |
| American black elderberry | Sambucus nigra ssp. canadensis | SANIC4 | Caprifoliaceae | Dicot |
| American bladdernut | Staphylea trifolia | STTR | Staphyleaceae | Dicot |
| American bluehearts | Buchnera americana | BUAM | Scrophulariaceae | Dicot |
| American bur-reed | Sparganium americanum | SPAM | Sparganiaceae | Monocot |
| American burnweed | Erechtites hieraciifolia | ERHI2 | Asteraceae | Dicot |
| American burnweed | Erechtites hieraciifolia var. hieraciifolia | ERHIH | Asteraceae | Dicot |
| American cancer-root | Conopholis americana | COAM | Orobanchaceae | Dicot |
| American chestnut | Castanea dentata | CADE12 | Fagaceae | Dicot |
| American climbing fern | Lygodium palmatum | LYPA3 | Lygodiaceae | Fern |
| American common reed | Phragmites australis ssp. americanus | PHAUA6 | Poaceae | Monocot |
| American cupscale | Sacciolepis striata | SAST | Poaceae | Monocot |
| American dragonhead | Dracocephalum parviflorum | DRPA2 | Lamiaceae | Dicot |
| American eelgrass | Vallisneria americana | VAAM3 | Hydrocharitaceae | Monocot |
| American elm | Ulmus americana | ULAM | Ulmaceae | Dicot |
| American false pennyroyal | Hedeoma pulegioides | HEPU | Lamiaceae | Dicot |
| American featherfoil | Hottonia inflata | HOIN | Primulaceae | Dicot |
| American fly honeysuckle | Lonicera canadensis | LOCA7 | Caprifoliaceae | Dicot |
| American ginseng | Panax quinquefolius | PAQU | Araliaceae | Dicot |
| American golden saxifrage | Chrysosplenium americanum | CHAM2 | Saxifragaceae | Dicot |
| American hazelnut | Corylus americana | COAM3 | Betulaceae | Dicot |
| American hogpeanut | Amphicarpaea bracteata | AMBR2 | Fabaceae | Dicot |
| American hogpeanut | Amphicarpaea bracteata var. bracteata | AMBRB | Fabaceae | Dicot |
| American hogpeanut | Amphicarpaea bracteata var. comosa | AMBRC | Fabaceae | Dicot |
| American holly | Ilex opaca | ILOP | Aquifoliaceae | Dicot |
| American holly | Ilex opaca var. opaca | ILOPO | Aquifoliaceae | Dicot |
| American hornbeam | Carpinus caroliniana | CACA18 | Betulaceae | Dicot |
| American hornbeam | Carpinus caroliniana ssp. caroliniana | CACAC2 | Betulaceae | Dicot |
| American hornbeam | Carpinus caroliniana ssp. virginiana | CACAV | Betulaceae | Dicot |
| American ipecac | Gillenia stipulata | GIST5 | Rosaceae | Dicot |
| American ipecac | Euphorbia ipecacuanhae | EUIP | Euphorbiaceae | Dicot |
| American lopseed | Phryma leptostachya | PHLE5 | Verbenaceae | Dicot |
| American lotus | Nelumbo lutea | NELU | Nelumbonaceae | Dicot |
| American mannagrass | Glyceria grandis | GLGR | Poaceae | Monocot |
| American mannagrass | Glyceria grandis var. grandis | GLGRG | Poaceae | Monocot |
| American marshpennywort | Hydrocotyle americana | HYAM | Apiaceae | Dicot |
| American milletgrass | Milium effusum | MIEF | Poaceae | Monocot |
| American milletgrass | Milium effusum var. cisatlanticum | MIEFC | Poaceae | Monocot |
| American mountain ash | Sorbus americana | SOAM3 | Rosaceae | Dicot |
| American plum | Prunus americana | PRAM | Rosaceae | Dicot |
| American pokeweed | Phytolacca americana | PHAM4 | Phytolaccaceae | Dicot |
| American pokeweed | Phytolacca americana var. americana | PHAMA3 | Phytolaccaceae | Dicot |
| American red raspberry | Rubus idaeus | RUID | Rosaceae | Dicot |
| American searocket | Cakile edentula | CAED | Brassicaceae | Dicot |
| American searocket | Cakile edentula ssp. edentula | CAEDE | Brassicaceae | Dicot |
| American searocket | Cakile edentula ssp. edentula var. edentula | CAEDE2 | Brassicaceae | Dicot |
| American senna | Senna hebecarpa | SEHE3 | Fabaceae | Dicot |
| American speedwell | Veronica americana | VEAM2 | Scrophulariaceae | Dicot |
| American spikenard | Aralia racemosa | ARRA | Araliaceae | Dicot |
| American spikenard | Aralia racemosa ssp. racemosa | ARRAR | Araliaceae | Dicot |
| American spongeplant | Limnobium spongia | LISP2 | Hydrocharitaceae | Monocot |
| American stoneseed | Lithospermum latifolium | LILA2 | Boraginaceae | Dicot |
| American sycamore | Platanus occidentalis | PLOC | Platanaceae | Dicot |
| American vetch | Vicia americana | VIAM | Fabaceae | Dicot |
| American vetch | Vicia americana ssp. americana | VIAMA3 | Fabaceae | Dicot |
| American water horehound | Lycopus americanus | LYAM | Lamiaceae | Dicot |
| American water plantain | Alisma subcordatum | ALSU | Alismataceae | Monocot |
| American water-willow | Justicia americana | JUAM | Acanthaceae | Dicot |
| American waterwort | Elatine americana | ELAM3 | Elatinaceae | Dicot |
| American white waterlily | Nymphaea odorata | NYOD | Nymphaeaceae | Dicot |
| American white waterlily | Nymphaea odorata ssp. odorata | NYODO | Nymphaeaceae | Dicot |
| American white waterlily | Nymphaea odorata ssp. tuberosa | NYODT | Nymphaeaceae | Dicot |
| American wintergreen | Pyrola americana | PYAM | Pyrolaceae | Dicot |
| American wisteria | Wisteria frutescens | WIFR | Fabaceae | Dicot |
| American witchhazel | Hamamelis virginiana | HAVI4 | Hamamelidaceae | Dicot |
| American woollyfruit sedge | Carex lasiocarpa var. americana | CALAA | Cyperaceae | Monocot |
| Ames" quillwort | Isoetes riparia var. amesii | ISRIA | Isoetaceae | Quillwort |
| amianthium | Amianthium | AMIAN | Liliaceae | Monocot |
| Amur honeysuckle | Lonicera maackii | LOMA6 | Caprifoliaceae | Dicot |
| Amur peppervine | Ampelopsis brevipedunculata | AMBR7 | Vitaceae | Dicot |
| Amur privet | Ligustrum amurense | LIAM | Oleaceae | Dicot |
| Andrews" blackberry | Rubus andrewsianus | RUAN2 | Rosaceae | Dicot |
| anemone | Anemone | ANEMO | Ranunculaceae | Dicot |
| angelica | Angelica | ANGEL | Apiaceae | Dicot |
| anglestem primrose-willow | Ludwigia leptocarpa | LULE4 | Onagraceae | Dicot |
| angularfruit milkvine | Matelea gonocarpos | MAGO | Asclepiadaceae | Dicot |
| anisescented goldenrod | Solidago odora | SOOD | Asteraceae | Dicot |
| anisescented goldenrod | Solidago odora var. odora | SOODO | Asteraceae | Dicot |
| annual bluegrass | Poa annua | POAN | Poaceae | Monocot |
| annual bushsunflower | Simsia lagasceiformis | SILA11 | Asteraceae | Dicot |
| annual canarygrass | Phalaris canariensis | PHCA5 | Poaceae | Monocot |
| annual fescue | Vulpia myuros | VUMY | Poaceae | Monocot |
| annual fimbry | Fimbristylis annua | FIAN | Cyperaceae | Monocot |
| annual honesty | Lunaria annua | LUAN | Brassicaceae | Dicot |
| annual mercury | Mercurialis annua | MEAN | Euphorbiaceae | Dicot |
| annual pearlwort | Sagina apetala | SAAP | Caryophyllaceae | Dicot |
| annual phlox | Phlox drummondii | PHDR | Polemoniaceae | Dicot |
| annual phlox | Phlox drummondii ssp. drummondii | PHDRD | Polemoniaceae | Dicot |
| annual rabbitsfoot grass | Polypogon monspeliensis | POMO5 | Poaceae | Monocot |
| annual ragweed | Ambrosia artemisiifolia | AMAR2 | Asteraceae | Dicot |
| annual ragweed | Ambrosia artemisiifolia var. elatior | AMARE | Asteraceae | Dicot |
| annual seepweed | Suaeda linearis | SULI | Chenopodiaceae | Dicot |
| annual silver hairgrass | Aira elegans | AIEL4 | Poaceae | Monocot |
| annual wildrice | Zizania aquatica | ZIAQ | Poaceae | Monocot |
| annual wildrice | Zizania aquatica var. aquatica | ZIAQA2 | Poaceae | Monocot |
| Appalachian barren strawberry | Waldsteinia fragarioides | WAFR | Rosaceae | Dicot |
| Appalachian barren strawberry | Waldsteinia fragarioides ssp. fragarioides | WAFRF | Rosaceae | Dicot |
| Appalachian false goat"s beard | Astilbe biternata | ASBI4 | Saxifragaceae | Dicot |
| Appalachian gooseberry | Ribes rotundifolium | RIRO2 | Grossulariaceae | Dicot |
| Appalachian oakfern | Gymnocarpium appalachianum | GYAP | Dryopteridaceae | Fern |
| Appalachian polypody | Polypodium appalachianum | POAP | Polypodiaceae | Fern |
| Appalachian quillwort | Isoetes engelmannii | ISEN | Isoetaceae | Quillwort |
| Appalachian sedge | Carex appalachica | CAAP5 | Cyperaceae | Monocot |
| Appalachian shoestring fern | Vittaria appalachiana | VIAP2 | Vittariaceae | Fern |
| Appalachian stitchwort | Minuartia glabra | MIGL5 | Caryophyllaceae | Dicot |
| Appalachian violet | Viola appalachiensis | VIAP | Violaceae | Dicot |
| apple | Malus | MALUS | Rosaceae | Dicot |
| apple of Peru | Nicandra physalodes | NIPH | Solanaceae | Dicot |
| arborvitae | Thuja | THUJA | Cupressaceae | Gymnosperm |
| arborvitae | Thuja occidentalis | THOC2 | Cupressaceae | Gymnosperm |
| arctic brome | Bromus kalmii | BRKA2 | Poaceae | Monocot |
| arctic reedgrass | Calamagrostis coarctata | CACO71 | Poaceae | Monocot |
| arctic rush | Juncus arcticus | JUAR2 | Juncaceae | Monocot |
| armoracia | Armoracia | ARMOR | Brassicaceae | Dicot |
| arnica | Arnica | ARNIC | Asteraceae | Dicot |
| aromatic aster | Symphyotrichum oblongifolium | SYOB | Asteraceae | Dicot |
| arrasa con todo | Gomphrena serrata | GOSE | Amaranthaceae | Dicot |
| arrow arum | Peltandra | PELTA | Araceae | Monocot |
| arrow bamboo | Pseudosasa | PSEUD9 | Poaceae | Monocot |
| arrow bamboo | Pseudosasa japonica | PSJA | Poaceae | Monocot |
| arrowfeather threeawn | Aristida purpurascens | ARPU8 | Poaceae | Monocot |
| arrowfeather threeawn | Aristida purpurascens var. purpurascens | ARPUP4 | Poaceae | Monocot |
| arrowfeather threeawn | Aristida purpurascens var. virgata | ARPUV | Poaceae | Monocot |
| arrowgrass | Triglochin | TRIGL | Juncaginaceae | Monocot |
| arrowhead | Sagittaria | SAGIT | Alismataceae | Monocot |
| arrowhead rattlebox | Crotalaria sagittalis | CRSA4 | Fabaceae | Dicot |
| arrowleaf tearthumb | Polygonum sagittatum | POSA5 | Polygonaceae | Dicot |
| arrowleaf violet | Viola sagittata | VISA2 | Violaceae | Dicot |
| arrowleaf violet | Viola sagittata var. ovata | VISAO | Violaceae | Dicot |
| arrowleaf violet | Viola sagittata var. sagittata | VISAS5 | Violaceae | Dicot |
| aruncus | Aruncus | ARUNC | Rosaceae | Dicot |
| ash | Fraxinus | FRAXI | Oleaceae | Dicot |
| ashy sunflower | Helianthus mollis | HEMO2 | Asteraceae | Dicot |
| Asian ponysfoot | Dichondra micrantha | DIMI | Convolvulaceae | Dicot |
| Asian spiderflower | Cleome viscosa | CLVI9 | Capparaceae | Dicot |
| Asiatic dayflower | Commelina communis | COCO3 | Commelinaceae | Monocot |
| Asiatic tearthumb | Polygonum perfoliatum | POPE10 | Polygonaceae | Dicot |
| asparagus | Asparagus | ASPAR | Liliaceae | Monocot |
| asplenium ladyfern | Athyrium filix-femina ssp. asplenioides | ATFIA2 | Dryopteridaceae | Fern |
| aster | Eurybia | EURYB | Asteraceae | Dicot |
| aster | Symphyotrichum | SYMPH4 | Asteraceae | Dicot |
| aster | Symphyotrichum ×amethystinum | SYAM3 | Asteraceae | Dicot |
| aster | Oclemena | OCLEM | Asteraceae | Dicot |
| aster | Ionactis | IONAC | Asteraceae | Dicot |
| Atamasco lily | Zephyranthes atamasca | ZEAT | Liliaceae | Monocot |
| Atlantic camas | Camassia scilloides | CASC5 | Liliaceae | Monocot |
| Atlantic goldenrod | Solidago arguta | SOAR | Asteraceae | Dicot |
| Atlantic goldenrod | Solidago arguta var. arguta | SOARA | Asteraceae | Dicot |
| Atlantic goldenrod | Solidago arguta var. caroliniana | SOARC | Asteraceae | Dicot |
| Atlantic mannagrass | Glyceria obtusa | GLOB | Poaceae | Monocot |
| Atlantic ninebark | Physocarpus opulifolius var. intermedius | PHOPI | Rosaceae | Dicot |
| Atlantic pigeonwings | Clitoria mariana | CLMA4 | Fabaceae | Dicot |
| Atlantic poison oak | Toxicodendron pubescens | TOPU2 | Anacardiaceae | Dicot |
| Atlantic sphagnum | Sphagnum atlanticum | SPAT3 | Sphagnaceae | Moss |
| Atlantic white cedar | Chamaecyparis thyoides | CHTH2 | Cupressaceae | Gymnosperm |
| Aunt Lucy | Ellisia nyctelea | ELNY | Hydrophyllaceae | Dicot |
| Australian redcedar | Toona ciliata | TOCI | Meliaceae | Dicot |
| Australian redcedar | Toona ciliata ssp. ciliata | TOCIC | Meliaceae | Dicot |
| Australian redcedar | Toona ciliata ssp. ciliata var. australis | TOCIA | Meliaceae | Dicot |
| autumn bluegrass | Poa autumnalis | POAU | Poaceae | Monocot |
| autumn coralroot | Corallorhiza odontorhiza | COOD7 | Orchidaceae | Monocot |
| autumn coralroot | Corallorhiza odontorhiza var. odontorhiza | COODO2 | Orchidaceae | Monocot |
| autumn crocus | Colchicum autumnale | COAU4 | Liliaceae | Monocot |
| autumn olive | Elaeagnus umbellata | ELUM | Elaeagnaceae | Dicot |
| autumn olive | Elaeagnus umbellata var. parvifolia | ELUMP | Elaeagnaceae | Dicot |
| avens | Geum | GEUM | Rosaceae | Dicot |
| awl-leaf arrowhead | Sagittaria subulata | SASU | Alismataceae | Monocot |
| awlfruit sedge | Carex stipata | CAST5 | Cyperaceae | Monocot |
| awned mountainmint | Pycnanthemum setosum | PYSE2 | Lamiaceae | Dicot |
| awnpetal meadowbeauty | Rhexia aristosa | RHAR | Melastomataceae | Dicot |
| axilflower | Mecardonia acuminata | MEAC | Scrophulariaceae | Dicot |
| axilflower | Mecardonia acuminata var. acuminata | MEACA | Scrophulariaceae | Dicot |
| Aztec marigold | Tagetes erecta | TAER | Asteraceae | Dicot |
| azure bluet | Houstonia caerulea | HOCA4 | Rubiaceae | Dicot |
| baby blue eyes | Nemophila | NEMOP | Hydrophyllaceae | Dicot |
| baby"s-breath | Gypsophila | GYPSO | Caryophyllaceae | Dicot |
| baccharis | Baccharis | BACCH | Asteraceae | Dicot |
| bahia | Bahia | BAHIA | Asteraceae | Dicot |
| Bailey"s dewberry | Rubus baileyanus | RUBA2 | Rosaceae | Dicot |
| Bailey"s sedge | Carex baileyi | CABA7 | Cyperaceae | Monocot |
| bald brome | Bromus racemosus | BRRA2 | Poaceae | Monocot |
| bald cypress | Taxodium | TAXOD | Cupressaceae | Gymnosperm |
| bald cypress | Taxodium distichum | TADI2 | Cupressaceae | Gymnosperm |
| bald spikerush | Eleocharis erythropoda | ELER | Cyperaceae | Monocot |
| Baldwin"s flatsedge | Cyperus croceus | CYCR6 | Cyperaceae | Monocot |
| Balkan catchfly | Silene csereii | SICS | Caryophyllaceae | Dicot |
| ballmustard | Calepina | CALEP | Brassicaceae | Dicot |
| balm | Melissa | MELIS | Lamiaceae | Dicot |
| balm-of-Gilead | Populus ×jackii | POJA2 | Salicaceae | Dicot |
| balsam fir | Abies balsamea | ABBA | Pinaceae | Gymnosperm |
| balsam fir | Abies balsamea var. balsamea | ABBAB | Pinaceae | Gymnosperm |
| balsam groundsel | Packera paupercula | PAPA20 | Asteraceae | Dicot |
| balsam poplar | Populus balsamifera | POBA2 | Salicaceae | Dicot |
| balsam poplar | Populus balsamifera ssp. balsamifera | POBAB2 | Salicaceae | Dicot |
| bamboo | Phyllostachys | PHYLL6 | Poaceae | Monocot |
| bamboo vine | Smilax pseudochina | SMPS | Smilacaceae | Monocot |
| baneberry | Actaea | ACTAE | Ranunculaceae | Dicot |
| Barbara"s buttons | Marshallia | MARSH | Asteraceae | Dicot |
| barbed bristlegrass | Setaria verticilliformis | SEVE5 | Poaceae | Monocot |
| barbed goatgrass | Aegilops triuncialis | AETR | Poaceae | Monocot |
| barbedbristle bulrush | Scirpus ancistrochaetus | SCAN5 | Cyperaceae | Monocot |
| barberry | Mahonia | MAHON | Berberidaceae | Dicot |
| barberry | Berberis | BERBE | Berberidaceae | Dicot |
| barefoot panicgrass | Panicum psilopodium | PAPS12 | Poaceae | Monocot |
| barestem teesdalia | Teesdalia nudicaulis | TENU | Brassicaceae | Dicot |
| barley | Hordeum | HORDE | Poaceae | Monocot |
| barnyardgrass | Echinochloa crus-galli | ECCR | Poaceae | Monocot |
| Barratt"s sedge | Carex barrattii | CABA9 | Cyperaceae | Monocot |
| barren strawberry | Waldsteinia | WALDS | Rosaceae | Dicot |
| bashful bulrush | Trichophorum planifolium | TRPL6 | Cyperaceae | Monocot |
| basil mountainmint | Pycnanthemum clinopodioides | PYCL | Lamiaceae | Dicot |
| basil thyme | Acinos arvensis | ACAR2 | Lamiaceae | Dicot |
| basketgrass | Oplismenus | OPLIS | Poaceae | Monocot |
| basketgrass | Oplismenus hirtellus | OPHI | Poaceae | Monocot |
| basketgrass | Oplismenus hirtellus ssp. undulatifolius | OPHIU2 | Poaceae | Monocot |
| basswood | Tilia | TILIA | Tiliaceae | Dicot |
| bastard toadflax | Comandra | COMAN | Santalaceae | Dicot |
| bastard toadflax | Comandra umbellata | COUM | Santalaceae | Dicot |
| bastard toadflax | Comandra umbellata ssp. umbellata | COUMU | Santalaceae | Dicot |
| bay | Persea | PERSE | Lauraceae | Dicot |
| bay forget-me-not | Myosotis laxa | MYLA | Boraginaceae | Dicot |
| bayberry | Morella | MOREL2 | Myricaceae | Dicot |
| bayonet rush | Juncus militaris | JUMI2 | Juncaceae | Monocot |
| beach false foxglove | Agalinis fasciculata | AGFA2 | Scrophulariaceae | Dicot |
| beach pinweed | Lechea maritima | LEMA | Cistaceae | Dicot |
| beach pinweed | Lechea maritima var. maritima | LEMAM | Cistaceae | Dicot |
| beach plum | Prunus maritima | PRMA2 | Rosaceae | Dicot |
| beach plum | Prunus maritima var. maritima | PRMAM | Rosaceae | Dicot |
| beach sedge | Carex silicea | CASI6 | Cyperaceae | Monocot |
| beachgrass | Ammophila | AMMOP | Poaceae | Monocot |
| beaked agrimony | Agrimonia rostellata | AGRO3 | Rosaceae | Dicot |
| beaked cornsalad | Valerianella radiata | VARA | Valerianaceae | Dicot |
| beaked dodder | Cuscuta rostrata | CURO | Cuscutaceae | Dicot |
| beaked hazelnut | Corylus cornuta | COCO6 | Betulaceae | Dicot |
| beaked hazelnut | Corylus cornuta var. cornuta | COCOC2 | Betulaceae | Dicot |
| beaked panicgrass | Panicum anceps | PAAN | Poaceae | Monocot |
| beaked spikerush | Eleocharis rostellata | ELRO2 | Cyperaceae | Monocot |
| beakgrain | Diarrhena | DIARR | Poaceae | Monocot |
| beaksedge | Rhynchospora | RHYNC3 | Cyperaceae | Monocot |
| Beale"s barberry | Mahonia bealei | MABE2 | Berberidaceae | Dicot |
| bean | Phaseolus | PHASE | Fabaceae | Dicot |
| bear oak | Quercus ilicifolia | QUIL | Fagaceae | Dicot |
| beard lichen | Usnea | USNEA2 | Parmeliaceae | Lichen |
| bearded beggarticks | Bidens aristosa | BIAR | Asteraceae | Dicot |
| bearded flatsedge | Cyperus squarrosus | CYSQ | Cyperaceae | Monocot |
| bearded shorthusk | Brachyelytrum erectum | BRER2 | Poaceae | Monocot |
| bearded skeletongrass | Gymnopogon ambiguus | GYAM | Poaceae | Monocot |
| bearded sprangletop | Leptochloa fusca ssp. fascicularis | LEFUF | Poaceae | Monocot |
| beardgrass | Bothriochloa | BOTHR | Poaceae | Monocot |
| beardtongue | Penstemon | PENST | Scrophulariaceae | Dicot |
| beargrass | Xerophyllum | XEROP | Liliaceae | Monocot |
| beautyberry | Callicarpa | CALLI2 | Verbenaceae | Dicot |
| Bebb willow | Salix bebbiana | SABE2 | Salicaceae | Dicot |
| Beck"s water-marigold | Bidens beckii | BIBE2 | Asteraceae | Dicot |
| bedstraw | Galium | GALIU | Rubiaceae | Dicot |
| bedstraw | Cruciata | CRUCI2 | Rubiaceae | Dicot |
| beebalm | Monarda | MONAR | Lamiaceae | Dicot |
| beeblossom | Gaura | GAURA | Onagraceae | Dicot |
| beech | Fagus | FAGUS | Fagaceae | Dicot |
| beechdrops | Epifagus | EPIFA | Orobanchaceae | Dicot |
| beechdrops | Epifagus virginiana | EPVI2 | Orobanchaceae | Dicot |
| beechfern | Phegopteris | PHEGO | Thelypteridaceae | Fern |
| beefsteakplant | Perilla frutescens | PEFR4 | Lamiaceae | Dicot |
| beefsteakplant | Perilla frutescens var. frutescens | PEFRF2 | Lamiaceae | Dicot |
| beggarslice | Hackelia virginiana | HAVI2 | Boraginaceae | Dicot |
| beggarticks | Bidens | BIDEN | Asteraceae | Dicot |
| belamcanda | Belamcanda | BELAM | Iridaceae | Monocot |
| bellflower | Campanula | CAMPA | Campanulaceae | Dicot |
| bellflower | Campanulastrum | CAMPA2 | Campanulaceae | Dicot |
| bellis | Bellis | BELLI | Asteraceae | Dicot |
| bellwort | Uvularia | UVULA | Liliaceae | Monocot |
| bent sedge | Carex styloflexa | CAST9 | Cyperaceae | Monocot |
| bentgrass | Agrostis | AGROS2 | Poaceae | Monocot |
| Bermudagrass | Cynodon | CYNOD | Poaceae | Monocot |
| Bermudagrass | Cynodon dactylon | CYDA | Poaceae | Monocot |
| Beyrich"s fleabane | Erigeron strigosus var. beyrichii | ERSTB | Asteraceae | Dicot |
| biennial beeblossom | Gaura biennis | GABI2 | Onagraceae | Dicot |
| biennial wormwood | Artemisia biennis | ARBI2 | Asteraceae | Dicot |
| biennial wormwood | Artemisia biennis var. biennis | ARBIB | Asteraceae | Dicot |
| big blue lilyturf | Liriope muscari | LIMU6 | Liliaceae | Monocot |
| big bluestem | Andropogon gerardii | ANGE | Poaceae | Monocot |
| big carpetgrass | Axonopus furcatus | AXFU | Poaceae | Monocot |
| big chickweed | Cerastium fontanum ssp. vulgare | CEFOV2 | Caryophyllaceae | Dicot |
| big cordgrass | Spartina cynosuroides | SPCY | Poaceae | Monocot |
| big devils beggartick | Bidens vulgata | BIVU | Asteraceae | Dicot |
| big floatingheart | Nymphoides aquatica | NYAQ | Menyanthaceae | Dicot |
| bigbract verbena | Verbena bracteata | VEBR | Verbenaceae | Dicot |
| bigfruit crab | Malus ×platycarpa | MAPL | Rosaceae | Dicot |
| bigfruit hawthorn | Crataegus macrosperma | CRMA3 | Rosaceae | Dicot |
| bighead rush | Juncus megacephalus | JUME | Juncaceae | Monocot |
| bigleaf aster | Eurybia macrophylla | EUMA27 | Asteraceae | Dicot |
| bigleaf lupine | Lupinus polyphyllus | LUPO2 | Fabaceae | Dicot |
| bigleaf lupine | Lupinus polyphyllus ssp. polyphyllus | LUPOP2 | Fabaceae | Dicot |
| bigleaf lupine | Lupinus polyphyllus ssp. polyphyllus var. polyphyllus | LUPOP4 | Fabaceae | Dicot |
| bigleaf magnolia | Magnolia macrophylla | MAMA2 | Magnoliaceae | Dicot |
| bigleaf periwinkle | Vinca major | VIMA | Apocynaceae | Dicot |
| bignonia | Bignonia | BIGNO | Bignoniaceae | Dicot |
| bigpod sesbania | Sesbania herbacea | SEHE8 | Fabaceae | Dicot |
| bigseed alfalfa dodder | Cuscuta indecora | CUIN | Cuscutaceae | Dicot |
| bigseed dodder | Cuscuta indecora var. neuropetala | CUINN | Cuscutaceae | Dicot |
| bigtooth aspen | Populus grandidentata | POGR4 | Salicaceae | Dicot |
| bigtop lovegrass | Eragrostis hirsuta | ERHI | Poaceae | Monocot |
| billion-dollar grass | Echinochloa frumentacea | ECFR | Poaceae | Monocot |
| bindweed | Convolvulus | CONVO | Convolvulaceae | Dicot |
| birch | Betula | BETUL | Betulaceae | Dicot |
| bird spiderflower | Cleome ornithopodioides | CLOR2 | Capparaceae | Dicot |
| bird vetch | Vicia cracca | VICR | Fabaceae | Dicot |
| bird vetch | Vicia cracca ssp. cracca | VICRC | Fabaceae | Dicot |
| bird"s-foot trefoil | Lotus corniculatus | LOCO6 | Fabaceae | Dicot |
| bird"s-foot trefoil | Lotus corniculatus var. corniculatus | LOCOC5 | Fabaceae | Dicot |
| birdeye pearlwort | Sagina procumbens | SAPR | Caryophyllaceae | Dicot |
| birdeye speedwell | Veronica persica | VEPE3 | Scrophulariaceae | Dicot |
| birdfoot violet | Viola pedata | VIPE | Violaceae | Dicot |
| birthwort | Aristolochia clematitis | ARCL | Aristolochiaceae | Dicot |
| bishop | Bifora | BIFOR | Apiaceae | Dicot |
| bishop"s goutweed | Aegopodium podagraria | AEPO | Apiaceae | Dicot |
| bitter dock | Rumex obtusifolius | RUOB | Polygonaceae | Dicot |
| bitter panicgrass | Panicum amarum | PAAM2 | Poaceae | Monocot |
| bitter panicgrass | Panicum amarum var. amarum | PAAMA3 | Poaceae | Monocot |
| bittercress | Cardamine | CARDA | Brassicaceae | Dicot |
| bitternut hickory | Carya cordiformis | CACO15 | Juglandaceae | Dicot |
| bittersweet | Celastrus | CELAS | Celastraceae | Dicot |
| black ash | Fraxinus nigra | FRNI | Oleaceae | Dicot |
| black baneberry | Actaea racemosa | ACRA7 | Ranunculaceae | Dicot |
| black bindweed | Polygonum convolvulus | POCO10 | Polygonaceae | Dicot |
| black bindweed | Polygonum convolvulus var. convolvulus | POCOC2 | Polygonaceae | Dicot |
| black bugbane | Actaea racemosa var. racemosa | ACRAR | Ranunculaceae | Dicot |
| black cherry | Prunus serotina | PRSE2 | Rosaceae | Dicot |
| black cherry | Prunus serotina var. serotina | PRSES | Rosaceae | Dicot |
| black chokeberry | Photinia melanocarpa | PHME13 | Rosaceae | Dicot |
| black edge sedge | Carex nigromarginata | CANI3 | Cyperaceae | Monocot |
| black elderberry | Sambucus nigra | SANI4 | Caprifoliaceae | Dicot |
| black gram | Vigna mungo | VIMU7 | Fabaceae | Dicot |
| black henbane | Hyoscyamus niger | HYNI | Solanaceae | Dicot |
| black highbush blueberry | Vaccinium fuscatum | VAFU | Ericaceae | Dicot |
| black horehound | Ballota nigra | BANI | Lamiaceae | Dicot |
| black horehound | Ballota nigra var. nigra | BANIN | Lamiaceae | Dicot |
| black huckleberry | Gaylussacia baccata | GABA | Ericaceae | Dicot |
| black locust | Robinia pseudoacacia | ROPS | Fabaceae | Dicot |
| black maple | Acer nigrum | ACNI5 | Aceraceae | Dicot |
| black medick | Medicago lupulina | MELU | Fabaceae | Dicot |
| black mustard | Brassica nigra | BRNI | Brassicaceae | Dicot |
| black nightshade | Solanum nigrum | SONI | Solanaceae | Dicot |
| black oak | Quercus velutina | QUVE | Fagaceae | Dicot |
| black raspberry | Rubus occidentalis | RUOC | Rosaceae | Dicot |
| black walnut | Juglans nigra | JUNI | Juglandaceae | Dicot |
| black willow | Salix nigra | SANI | Salicaceae | Dicot |
| blackberry | Rubus | RUBUS | Rosaceae | Dicot |
| blackberry lily | Belamcanda chinensis | BECH | Iridaceae | Monocot |
| blackdisk medick | Medicago orbicularis | MEOR2 | Fabaceae | Dicot |
| blackeyed Susan | Rudbeckia hirta | RUHI2 | Asteraceae | Dicot |
| blackeyed Susan | Rudbeckia hirta var. hirta | RUHIH | Asteraceae | Dicot |
| blackeyed Susan | Rudbeckia hirta var. pulcherrima | RUHIP | Asteraceae | Dicot |
| blackfoot | Melampodium | MELAM | Asteraceae | Dicot |
| blackfruit spikerush | Eleocharis melanocarpa | ELME | Cyperaceae | Monocot |
| blackgum | Nyssa sylvatica | NYSY | Cornaceae | Dicot |
| blackhaw | Viburnum prunifolium | VIPR | Caprifoliaceae | Dicot |
| blackjack oak | Quercus marilandica | QUMA3 | Fagaceae | Dicot |
| blackjack oak | Quercus marilandica var. marilandica | QUMAM2 | Fagaceae | Dicot |
| blackseed plantain | Plantago rugelii | PLRU | Plantaginaceae | Dicot |
| blackseed plantain | Plantago rugelii var. rugelii | PLRUR | Plantaginaceae | Dicot |
| blackseed ricegrass | Patis racemosa | PARA2 | Poaceae | Monocot |
| blackseed speargrass | Piptochaetium avenaceum | PIAV | Poaceae | Monocot |
| blackstem spleenwort | Asplenium resiliens | ASRE | Aspleniaceae | Fern |
| blackthorn | Prunus spinosa | PRSP | Rosaceae | Dicot |
| bladder campion | Silene latifolia | SILA21 | Caryophyllaceae | Dicot |
| bladder campion | Silene latifolia ssp. alba | SILAA3 | Caryophyllaceae | Dicot |
| bladderfern | Cystopteris | CYSTO | Dryopteridaceae | Fern |
| bladdernut | Staphylea | STAPH | Staphyleaceae | Dicot |
| bladderwort | Utricularia | UTRIC | Lentibulariaceae | Dicot |
| blazing star | Liatris | LIATR | Asteraceae | Dicot |
| bleeding heart | Dicentra | DICEN | Fumariaceae | Dicot |
| blessed milkthistle | Silybum marianum | SIMA3 | Asteraceae | Dicot |
| blessed thistle | Cnicus benedictus | CNBE | Asteraceae | Dicot |
| blindeyes | Papaver dubium | PADU | Papaveraceae | Dicot |
| blister sedge | Carex vesicaria | CAVE6 | Cyperaceae | Monocot |
| blisterwort | Ranunculus recurvatus | RARE2 | Ranunculaceae | Dicot |
| blisterwort | Ranunculus recurvatus var. recurvatus | RARER2 | Ranunculaceae | Dicot |
| bloodleaf | Iresine | IRESI | Amaranthaceae | Dicot |
| bloodroot | Sanguinaria | SANGU | Papaveraceae | Dicot |
| bloodroot | Sanguinaria canadensis | SACA13 | Papaveraceae | Dicot |
| blue bugle | Ajuga genevensis | AJGE | Lamiaceae | Dicot |
| blue cohosh | Caulophyllum thalictroides | CATH2 | Berberidaceae | Dicot |
| blue fenugreek | Trigonella caerulea | TRCA14 | Fabaceae | Dicot |
| blue fieldmadder | Sherardia arvensis | SHAR2 | Rubiaceae | Dicot |
| blue huckleberry | Gaylussacia frondosa | GAFR2 | Ericaceae | Dicot |
| blue maidencane | Amphicarpum purshii | AMPU6 | Poaceae | Monocot |
| blue mistflower | Conoclinium coelestinum | COCO13 | Asteraceae | Dicot |
| blue plantain lily | Hosta ventricosa | HOVE | Liliaceae | Monocot |
| Blue Ridge blueberry | Vaccinium pallidum | VAPA4 | Ericaceae | Dicot |
| Blue Ridge sedge | Carex lucorum | CALU17 | Cyperaceae | Monocot |
| Blue Ridge sedge | Carex lucorum var. lucorum | CALUL | Cyperaceae | Monocot |
| blue sedge | Carex glaucodea | CAGL6 | Cyperaceae | Monocot |
| blue skullcap | Scutellaria lateriflora | SCLA2 | Lamiaceae | Dicot |
| blue skullcap | Scutellaria lateriflora var. lateriflora | SCLAL2 | Lamiaceae | Dicot |
| blue spruce | Picea pungens | PIPU | Pinaceae | Gymnosperm |
| blue waterhyssop | Bacopa caroliniana | BACA | Scrophulariaceae | Dicot |
| blue waxweed | Cuphea viscosissima | CUVI | Lythraceae | Dicot |
| blue wild indigo | Baptisia australis | BAAU | Fabaceae | Dicot |
| blue wild indigo | Baptisia australis var. australis | BAAUA | Fabaceae | Dicot |
| blue woodruff | Asperula arvensis | ASAR2 | Rubiaceae | Dicot |
| blue-eyed grass | Sisyrinchium | SISYR | Iridaceae | Monocot |
| bluebead | Clintonia | CLINT | Liliaceae | Monocot |
| bluebead | Clintonia borealis | CLBO3 | Liliaceae | Monocot |
| bluebell bellflower | Campanula rotundifolia | CARO2 | Campanulaceae | Dicot |
| bluebells | Mertensia | MERTE | Boraginaceae | Dicot |
| blueberry | Vaccinium ×marianum | VAMA2 | Ericaceae | Dicot |
| blueberry | Vaccinium | VACCI | Ericaceae | Dicot |
| bluecurls | Trichostema | TRICH9 | Lamiaceae | Dicot |
| bluegrass | Poa | POA | Poaceae | Monocot |
| bluehearts | Buchnera | BUCHN | Scrophulariaceae | Dicot |
| bluejacket | Tradescantia ohiensis | TROH | Commelinaceae | Monocot |
| bluejoint | Calamagrostis canadensis | CACA4 | Poaceae | Monocot |
| bluejoint | Calamagrostis canadensis var. canadensis | CACAC10 | Poaceae | Monocot |
| bluestar | Amsonia | AMSON | Apocynaceae | Dicot |
| bluestem | Andropogon | ANDRO2 | Poaceae | Monocot |
| bluestem pricklypoppy | Argemone albiflora | ARAL3 | Papaveraceae | Dicot |
| bluestem pricklypoppy | Argemone albiflora ssp. albiflora | ARALA2 | Papaveraceae | Dicot |
| bluet | Houstonia | HOUST | Rubiaceae | Dicot |
| blunt broom sedge | Carex tribuloides | CATR7 | Cyperaceae | Monocot |
| blunt broom sedge | Carex tribuloides var. sangamonensis | CATRS2 | Cyperaceae | Monocot |
| blunt broom sedge | Carex tribuloides var. tribuloides | CATRT2 | Cyperaceae | Monocot |
| blunt spikerush | Eleocharis obtusa | ELOB2 | Cyperaceae | Monocot |
| bluntleaf bedstraw | Galium obtusum | GAOB | Rubiaceae | Dicot |
| bluntleaf bedstraw | Galium obtusum ssp. filifolium | GAOBF2 | Rubiaceae | Dicot |
| bluntleaf bedstraw | Galium obtusum ssp. obtusum | GAOBO | Rubiaceae | Dicot |
| bluntleaf pondweed | Potamogeton obtusifolius | POOB2 | Potamogetonaceae | Monocot |
| bluntleaf sandwort | Moehringia lateriflora | MOLA6 | Caryophyllaceae | Dicot |
| bluntleaf waterleaf | Hydrophyllum canadense | HYCA3 | Hydrophyllaceae | Dicot |
| bluntlobe cliff fern | Woodsia obtusa | WOOB2 | Dryopteridaceae | Fern |
| bluntlobe cliff fern | Woodsia obtusa ssp. obtusa | WOOBO | Dryopteridaceae | Fern |
| bluntlobe grapefern | Botrychium oneidense | BOON | Ophioglossaceae | Fern |
| bog aster | Oclemena nemoralis | OCNE2 | Asteraceae | Dicot |
| bog bulrush | Schoenoplectiella mucronata | SCMU15 | Cyperaceae | Monocot |
| bog chickweed | Stellaria alsine | STAL4 | Caryophyllaceae | Dicot |
| bog fern | Thelypteris simulata | THSI2 | Thelypteridaceae | Fern |
| bog goldenrod | Solidago uliginosa | SOUL | Asteraceae | Dicot |
| bog goldenrod | Solidago uliginosa var. uliginosa | SOULU | Asteraceae | Dicot |
| bog muhly | Muhlenbergia uniflora | MUUN | Poaceae | Monocot |
| bog rush | Juncus biflorus | JUBI | Juncaceae | Monocot |
| bog smartweed | Polygonum setaceum | POSE6 | Polygonaceae | Dicot |
| bog white violet | Viola lanceolata | VILA4 | Violaceae | Dicot |
| bog white violet | Viola lanceolata ssp. lanceolata | VILAL | Violaceae | Dicot |
| bog willowherb | Epilobium leptophyllum | EPLE2 | Onagraceae | Dicot |
| bog yellowcress | Rorippa palustris | ROPA2 | Brassicaceae | Dicot |
| bog yellowcress | Rorippa palustris ssp. palustris | ROPAP | Brassicaceae | Dicot |
| bog yelloweyed grass | Xyris difformis | XYDI | Xyridaceae | Monocot |
| bog yelloweyed grass | Xyris difformis var. difformis | XYDID | Xyridaceae | Monocot |
| bogbutton | Sclerolepis | SCLER5 | Asteraceae | Dicot |
| bogmat | Wolffiella | WOLFF2 | Lemnaceae | Monocot |
| Bonpland"s croton | Croton bonplandianus | CRBO4 | Euphorbiaceae | Dicot |
| borage | Borago | BORAG | Boraginaceae | Dicot |
| border privet | Ligustrum obtusifolium | LIOB | Oleaceae | Dicot |
| boreal starwort | Stellaria borealis | STBO3 | Caryophyllaceae | Dicot |
| boreal starwort | Stellaria borealis ssp. borealis | STBOB | Caryophyllaceae | Dicot |
| Bosc"s panicgrass | Dichanthelium boscii | DIBO2 | Poaceae | Monocot |
| Boston ivy | Parthenocissus tricuspidata | PATR6 | Vitaceae | Dicot |
| bottle gentian | Gentiana clausa | GECL | Gentianaceae | Dicot |
| bottlebrush sedge | Carex hystericina | CAHY4 | Cyperaceae | Monocot |
| bottomland dewberry | Rubus leviculus | RULE3 | Rosaceae | Dicot |
| bouncingbet | Saponaria officinalis | SAOF4 | Caryophyllaceae | Dicot |
| bouquet mudplantain | Heteranthera multiflora | HEMU5 | Pontederiaceae | Monocot |
| Bowman"s root | Gillenia trifoliata | GITR6 | Rosaceae | Dicot |
| box huckleberry | Gaylussacia brachycera | GABR5 | Ericaceae | Dicot |
| boxelder | Acer negundo | ACNE2 | Aceraceae | Dicot |
| boxelder | Acer negundo var. negundo | ACNEN | Aceraceae | Dicot |
| brackenfern | Pteridium | PTERI | Dennstaedtiaceae | Fern |
| Bradley"s spleenwort | Asplenium bradleyi | ASBR2 | Aspleniaceae | Fern |
| brake fern | Pteris | PTERI2 | Pteridaceae | Fern |
| branched bur-reed | Sparganium androcladum | SPAN | Sparganiaceae | Monocot |
| branched centaury | Centaurium pulchellum | CEPU3 | Gentianaceae | Dicot |
| branched draba | Draba ramosissima | DRRA | Brassicaceae | Dicot |
| branched hedgehyssop | Gratiola ramosa | GRRA | Scrophulariaceae | Dicot |
| brasenia | Brasenia | BRASE | Cabombaceae | Dicot |
| Braun"s erigeron | Erigeron pulchellus var. brauniae | ERPUB | Asteraceae | Dicot |
| Brazilian watermeal | Wolffia brasiliensis | WOBR | Lemnaceae | Monocot |
| Brazilian waterweed | Egeria densa | EGDE | Hydrocharitaceae | Monocot |
| brickellbush | Brickellia | BRICK | Asteraceae | Dicot |
| bridalwreath spirea | Spiraea prunifolia | SPPR | Rosaceae | Dicot |
| bride"s feathers | Aruncus dioicus | ARDI8 | Rosaceae | Dicot |
| bride"s feathers | Aruncus dioicus var. dioicus | ARDID2 | Rosaceae | Dicot |
| bride"s feathers | Aruncus dioicus var. pubescens | ARDIP | Rosaceae | Dicot |
| bright green spikerush | Eleocharis olivacea | ELOL | Cyperaceae | Monocot |
| bright green spikerush | Eleocharis olivacea var. olivacea | ELOLO | Cyperaceae | Monocot |
| brightblue speedwell | Veronica serpyllifolia ssp. humifusa | VESEH2 | Scrophulariaceae | Dicot |
| bristle berry | Rubus notatus | RUNO2 | Rosaceae | Dicot |
| bristle fern | Trichomanes | TRICH5 | Hymenophyllaceae | Fern |
| bristlegrass | Setaria | SETAR | Poaceae | Monocot |
| bristleleaf sedge | Carex eburnea | CAEB2 | Cyperaceae | Monocot |
| bristlemallow | Modiola | MODIO | Malvaceae | Dicot |
| bristly buttercup | Ranunculus hispidus | RAHI | Ranunculaceae | Dicot |
| bristly buttercup | Ranunculus hispidus var. hispidus | RAHIH | Ranunculaceae | Dicot |
| bristly buttercup | Ranunculus hispidus var. nitidus | RAHIN | Ranunculaceae | Dicot |
| bristly dewberry | Rubus hispidus | RUHI | Rosaceae | Dicot |
| bristly dogstail grass | Cynosurus echinatus | CYEC | Poaceae | Monocot |
| bristly flatsedge | Cyperus hystricinus | CYHY | Cyperaceae | Monocot |
| bristly greenbrier | Smilax tamnoides | SMTA2 | Smilacaceae | Monocot |
| bristly hawkbit | Leontodon hispidus | LEHI | Asteraceae | Dicot |
| bristly hawkbit | Leontodon hispidus ssp. hispidus | LEHIH | Asteraceae | Dicot |
| bristly locust | Robinia hispida | ROHI | Fabaceae | Dicot |
| bristly locust | Robinia hispida var. fertilis | ROHIF8 | Fabaceae | Dicot |
| bristly locust | Robinia hispida var. hispida | ROHIH | Fabaceae | Dicot |
| bristly locust | Robinia hispida var. nana | ROHIN | Fabaceae | Dicot |
| bristly nama | Nama hispidum | NAHI | Hydrophyllaceae | Dicot |
| bristly oxtongue | Picris echioides | PIEC | Asteraceae | Dicot |
| bristly sarsaparilla | Aralia hispida | ARHI2 | Araliaceae | Dicot |
| bristlystalked sedge | Carex leptalea | CALE10 | Cyperaceae | Monocot |
| bristlystalked sedge | Carex leptalea ssp. leptalea | CALEL4 | Cyperaceae | Monocot |
| British soldier lichen | Cladonia cristatella | CLCR2 | Cladoniaceae | Lichen |
| brittlestem hempnettle | Galeopsis tetrahit | GATE2 | Lamiaceae | Dicot |
| brittlestem hempnettle | Galeopsis tetrahit var. tetrahit | GATET2 | Lamiaceae | Dicot |
| Britton"s phlox | Phlox subulata ssp. brittonii | PHSUB2 | Polemoniaceae | Dicot |
| broad beechfern | Phegopteris hexagonoptera | PHHE11 | Thelypteridaceae | Fern |
| broad looseflower sedge | Carex laxiflora | CALA19 | Cyperaceae | Monocot |
| broad looseflower sedge | Carex laxiflora var. laxiflora | CALAL5 | Cyperaceae | Monocot |
| broadfruit bur-reed | Sparganium eurycarpum | SPEU | Sparganiaceae | Monocot |
| broadleaf arrowhead | Sagittaria latifolia | SALA2 | Alismataceae | Monocot |
| broadleaf cattail | Typha latifolia | TYLA | Typhaceae | Monocot |
| broadleaf enchanter"s nightshade | Circaea lutetiana | CILU | Onagraceae | Dicot |
| broadleaf enchanter"s nightshade | Circaea lutetiana ssp. canadensis | CILUC | Onagraceae | Dicot |
| broadleaf helleborine | Epipactis helleborine | EPHE | Orchidaceae | Monocot |
| broadleaf ironweed | Vernonia glauca | VEGL | Asteraceae | Dicot |
| broadleaf rosette grass | Dichanthelium latifolium | DILA8 | Poaceae | Monocot |
| broadleaf sedge | Carex platyphylla | CAPL5 | Cyperaceae | Monocot |
| broadleaf signalgrass | Urochloa platyphylla | URPL2 | Poaceae | Monocot |
| broadleaf speedwell | Veronica austriaca | VEAU | Scrophulariaceae | Dicot |
| broadleaf speedwell | Veronica austriaca ssp. teucrium | VEAUT | Scrophulariaceae | Dicot |
| broadtooth hedgenettle | Stachys latidens | STLA5 | Lamiaceae | Dicot |
| broadwing sedge | Carex alata | CAAL3 | Cyperaceae | Monocot |
| brome | Bromus | BROMU | Poaceae | Monocot |
| brome-like sedge | Carex bromoides | CABR14 | Cyperaceae | Monocot |
| brome-like sedge | Carex bromoides ssp. bromoides | CABRB6 | Cyperaceae | Monocot |
| brook cinquefoil | Potentilla rivalis | PORI3 | Rosaceae | Dicot |
| brookweed | Samolus | SAMOL | Primulaceae | Dicot |
| broom | Cytisus | CYTIS | Fabaceae | Dicot |
| broom | Genista | GENIS | Fabaceae | Dicot |
| broom sedge | Carex scoparia | CASC11 | Cyperaceae | Monocot |
| broom sedge | Carex scoparia var. scoparia | CASCS | Cyperaceae | Monocot |
| broomcorn millet | Panicum miliaceum ssp. miliaceum | PAMIM | Poaceae | Monocot |
| broomrape | Orobanche | OROBA | Orobanchaceae | Dicot |
| broomsedge bluestem | Andropogon virginicus | ANVI2 | Poaceae | Monocot |
| broomsedge bluestem | Andropogon virginicus var. virginicus | ANVIV | Poaceae | Monocot |
| broussonetia | Broussonetia | BROUS | Moraceae | Dicot |
| brown beaksedge | Rhynchospora fusca | RHFU | Cyperaceae | Monocot |
| brown flatsedge | Cyperus fuscus | CYFU3 | Cyperaceae | Monocot |
| brown mustard | Brassica juncea | BRJU | Brassicaceae | Dicot |
| brown widelip orchid | Liparis liliifolia | LILI3 | Orchidaceae | Monocot |
| browneyed Susan | Rudbeckia triloba | RUTR2 | Asteraceae | Dicot |
| browneyed Susan | Rudbeckia triloba var. triloba | RUTRT | Asteraceae | Dicot |
| brownfruit rush | Juncus pelocarpus | JUPE | Juncaceae | Monocot |
| brownish beaksedge | Rhynchospora capitellata | RHCA12 | Cyperaceae | Monocot |
| brownish sedge | Carex brunnescens | CABR15 | Cyperaceae | Monocot |
| brownish sedge | Carex brunnescens ssp. sphaerostachya | CABRS | Cyperaceae | Monocot |
| brownray knapweed | Centaurea jacea | CEJA | Asteraceae | Dicot |
| browntop | Microstegium | MICRO7 | Poaceae | Monocot |
| browntop millet | Urochloa ramosa | URRA | Poaceae | Monocot |
| buckbean | Menyanthes | MENYA | Menyanthaceae | Dicot |
| buckbean | Menyanthes trifoliata | METR3 | Menyanthaceae | Dicot |
| buckeye | Aesculus | AESCU | Hippocastanaceae | Dicot |
| buckeye | Aesculus ×hybrida | AEHY | Hippocastanaceae | Dicot |
| buckthorn | Frangula | FRANG | Rhamnaceae | Dicot |
| buckthorn | Rhamnus | RHAMN | Rhamnaceae | Dicot |
| buckthorn bully | Sideroxylon lycioides | SILY | Sapotaceae | Dicot |
| buckwheat | Fagopyrum | FAGOP2 | Polygonaceae | Dicot |
| buckwheat | Fagopyrum esculentum | FAES2 | Polygonaceae | Dicot |
| buffalo clover | Trifolium reflexum | TRRE2 | Fabaceae | Dicot |
| buffalobur nightshade | Solanum rostratum | SORO | Solanaceae | Dicot |
| bugbane | Trautvetteria | TRAUT | Ranunculaceae | Dicot |
| bugle | Ajuga | AJUGA | Lamiaceae | Dicot |
| bugloss | Anchusa | ANCHU | Boraginaceae | Dicot |
| buglossoides | Buglossoides | BUGLO | Boraginaceae | Dicot |
| Bukhara fleeceflower | Polygonum baldschuanicum | POBA3 | Polygonaceae | Dicot |
| bulblet bladderfern | Cystopteris bulbifera | CYBU3 | Dryopteridaceae | Fern |
| bulblet-bearing water hemlock | Cicuta bulbifera | CIBU | Apiaceae | Dicot |
| bulbous bittercress | Cardamine bulbosa | CABU3 | Brassicaceae | Dicot |
| bulbous bluegrass | Poa bulbosa | POBU | Poaceae | Monocot |
| bulbous woodrush | Luzula bulbosa | LUBU | Juncaceae | Monocot |
| bull crowngrass | Paspalum boscianum | PABO3 | Poaceae | Monocot |
| bull thistle | Cirsium vulgare | CIVU | Asteraceae | Dicot |
| bulltongue arrowhead | Sagittaria lancifolia | SALA | Alismataceae | Monocot |
| bulltongue arrowhead | Sagittaria lancifolia ssp. media | SALAM2 | Alismataceae | Monocot |
| bully | Sideroxylon | SIDER2 | Sapotaceae | Dicot |
| bulrush | Schoenoplectiella | SCHOE7 | Cyperaceae | Monocot |
| bulrush | Schoenoplectus | SCHOE6 | Cyperaceae | Monocot |
| bulrush | Scirpus | SCIRP | Cyperaceae | Monocot |
| bulrush | Trichophorum | TRICH22 | Cyperaceae | Monocot |
| bunchberry dogwood | Cornus canadensis | COCA13 | Cornaceae | Dicot |
| bunched beaksedge | Rhynchospora cephalantha | RHCE | Cyperaceae | Monocot |
| bundleflower | Desmanthus | DESMA | Fabaceae | Dicot |
| bupleurum | Bupleurum | BUPLE | Apiaceae | Dicot |
| bur cucumber | Sicyos | SICYO | Cucurbitaceae | Dicot |
| bur grass | Tragus | TRAGU | Poaceae | Monocot |
| bur oak | Quercus macrocarpa | QUMA2 | Fagaceae | Dicot |
| bur oak | Quercus macrocarpa var. macrocarpa | QUMAM | Fagaceae | Dicot |
| bur-reed | Sparganium | SPARG | Sparganiaceae | Monocot |
| bur-reed sedge | Carex sparganioides | CASP3 | Cyperaceae | Monocot |
| burdock | Arctium | ARCTI | Asteraceae | Dicot |
| burhead | Echinodorus | ECHIN6 | Alismataceae | Monocot |
| Burk"s smooth rockcress | Arabis laevigata var. burkii | ARLAB | Brassicaceae | Dicot |
| burnet | Sanguisorba | SANGU2 | Rosaceae | Dicot |
| burnet saxifrage | Pimpinella | PIMPI | Apiaceae | Dicot |
| burningbush | Euonymus alatus | EUAL13 | Celastraceae | Dicot |
| burningbush | Euonymus alatus var. alatus | EUALA2 | Celastraceae | Dicot |
| burningbush | Euonymus atropurpureus | EUAT5 | Celastraceae | Dicot |
| burnweed | Erechtites | ERECH | Asteraceae | Dicot |
| bursting-heart | Euonymus americanus | EUAM9 | Celastraceae | Dicot |
| bush honeysuckle | Diervilla | DIERV | Caprifoliaceae | Dicot |
| Bush"s goosefoot | Chenopodium berlandieri var. bushianum | CHBEB3 | Chenopodiaceae | Dicot |
| Bush"s sedge | Carex bushii | CABU5 | Cyperaceae | Monocot |
| bushsunflower | Simsia | SIMSI | Asteraceae | Dicot |
| bushy bluestem | Andropogon glomeratus | ANGL2 | Poaceae | Monocot |
| bushy bluestem | Andropogon glomeratus var. glomeratus | ANGLG2 | Poaceae | Monocot |
| bushy bluestem | Andropogon glomeratus var. hirsutior | ANGLH | Poaceae | Monocot |
| bushy knotweed | Polygonum ramosissimum | PORA3 | Polygonaceae | Dicot |
| bushy knotweed | Polygonum ramosissimum var. prolificum | PORAP | Polygonaceae | Dicot |
| bushy knotweed | Polygonum ramosissimum var. ramosissimum | PORAR | Polygonaceae | Dicot |
| bushy seaside tansy | Borrichia frutescens | BOFR | Asteraceae | Dicot |
| bushy St. Johnswort | Hypericum densiflorum | HYDE | Clusiaceae | Dicot |
| butter and eggs | Linaria vulgaris | LIVU2 | Scrophulariaceae | Dicot |
| buttercup | Ranunculus | RANUN | Ranunculaceae | Dicot |
| butterfly milkweed | Asclepias tuberosa | ASTU | Asclepiadaceae | Dicot |
| butterfly milkweed | Asclepias tuberosa ssp. tuberosa | ASTUT2 | Asclepiadaceae | Dicot |
| butterfly pea | Centrosema | CENTR2 | Fabaceae | Dicot |
| butterflybush | Buddleja | BUDDL2 | Buddlejaceae | Dicot |
| butternut | Juglans cinerea | JUCI | Juglandaceae | Dicot |
| butterweed | Packera glabella | PAGL17 | Asteraceae | Dicot |
| button eryngo | Eryngium yuccifolium | ERYU | Apiaceae | Dicot |
| button eryngo | Eryngium yuccifolium var. yuccifolium | ERYUY | Apiaceae | Dicot |
| button sedge | Carex bullata | CABU7 | Cyperaceae | Monocot |
| buttonbush | Cephalanthus | CEPHA | Rubiaceae | Dicot |
| buttonweed | Diodia | DIODI | Rubiaceae | Dicot |
| Buxbaum"s sedge | Carex buxbaumii | CABU6 | Cyperaceae | Monocot |
| cabbage | Brassica oleracea | BROL | Brassicaceae | Dicot |
| cajanus | Cajanus | CAJAN | Fabaceae | Dicot |
| calamint | Calamintha | CALAM4 | Lamiaceae | Dicot |
| calamus | Acorus calamus | ACCA4 | Acoraceae | Monocot |
| Caley pea | Lathyrus hirsutus | LAHI2 | Fabaceae | Dicot |
| calico aster | Symphyotrichum lateriflorum | SYLA4 | Asteraceae | Dicot |
| calico aster | Symphyotrichum lateriflorum var. horizontale | SYLAH5 | Asteraceae | Dicot |
| calico aster | Symphyotrichum lateriflorum var. lateriflorum | SYLAL7 | Asteraceae | Dicot |
| calicoplant | Alternanthera bettzichiana | ALBE | Amaranthaceae | Dicot |
| California nettle | Urtica dioica ssp. gracilis | URDIG | Urticaceae | Dicot |
| California privet | Ligustrum ovalifolium | LIOV | Oleaceae | Dicot |
| callalily | Calla | CALLA | Araceae | Monocot |
| Callery pear | Pyrus calleryana | PYCA80 | Rosaceae | Dicot |
| caltrop | Kallstroemia | KALLS | Zygophyllaceae | Dicot |
| camas | Camassia | CAMAS | Liliaceae | Monocot |
| camphor pluchea | Pluchea camphorata | PLCA7 | Asteraceae | Dicot |
| camphorweed | Pluchea | PLUCH | Asteraceae | Dicot |
| camphorweed | Heterotheca subaxillaris | HESU3 | Asteraceae | Dicot |
| campion | Lychnis | LYCHN | Caryophyllaceae | Dicot |
| campsis | Campsis | CAMPS | Bignoniaceae | Dicot |
| Canada bluegrass | Poa compressa | POCO | Poaceae | Monocot |
| Canada cocklebur | Xanthium strumarium var. canadense | XASTC | Asteraceae | Dicot |
| Canada germander | Teucrium canadense | TECA3 | Lamiaceae | Dicot |
| Canada germander | Teucrium canadense var. canadense | TECAC | Lamiaceae | Dicot |
| Canada goldenrod | Solidago altissima | SOAL6 | Asteraceae | Dicot |
| Canada goldenrod | Solidago canadensis | SOCA6 | Asteraceae | Dicot |
| Canada lettuce | Lactuca canadensis | LACA | Asteraceae | Dicot |
| Canada lily | Lilium canadense | LICA3 | Liliaceae | Monocot |
| Canada lily | Lilium canadense ssp. canadense | LICAC | Liliaceae | Monocot |
| Canada lily | Lilium canadense ssp. editorum | LICAE | Liliaceae | Monocot |
| Canada mayflower | Maianthemum canadense | MACA4 | Liliaceae | Monocot |
| Canada spikesedge | Eleocharis geniculata | ELGE | Cyperaceae | Monocot |
| Canada thistle | Cirsium arvense | CIAR4 | Asteraceae | Dicot |
| Canada toadflax | Nuttallanthus canadensis | NUCA | Scrophulariaceae | Dicot |
| Canada wildrye | Elymus canadensis | ELCA4 | Poaceae | Monocot |
| Canada yew | Taxus canadensis | TACA7 | Taxaceae | Gymnosperm |
| Canadian anemone | Anemone canadensis | ANCA8 | Ranunculaceae | Dicot |
| Canadian blacksnakeroot | Sanicula canadensis | SACA15 | Apiaceae | Dicot |
| Canadian blacksnakeroot | Sanicula canadensis var. canadensis | SACAC2 | Apiaceae | Dicot |
| Canadian burnet | Sanguisorba canadensis | SACA14 | Rosaceae | Dicot |
| Canadian clearweed | Pilea pumila | PIPU2 | Urticaceae | Dicot |
| Canadian clearweed | Pilea pumila var. pumila | PIPUP | Urticaceae | Dicot |
| Canadian honewort | Cryptotaenia canadensis | CRCA9 | Apiaceae | Dicot |
| Canadian horseweed | Conyza canadensis | COCA5 | Asteraceae | Dicot |
| Canadian horseweed | Conyza canadensis var. canadensis | COCAC3 | Asteraceae | Dicot |
| Canadian horseweed | Conyza canadensis var. pusilla | COCAP3 | Asteraceae | Dicot |
| Canadian licorice-root | Ligusticum canadense | LICA16 | Apiaceae | Dicot |
| Canadian lousewort | Pedicularis canadensis | PECA | Scrophulariaceae | Dicot |
| Canadian lousewort | Pedicularis canadensis ssp. canadensis | PECAC3 | Scrophulariaceae | Dicot |
| Canadian milkvetch | Astragalus canadensis | ASCA11 | Fabaceae | Dicot |
| Canadian milkvetch | Astragalus canadensis var. canadensis | ASCAC6 | Fabaceae | Dicot |
| Canadian rush | Juncus canadensis | JUCA3 | Juncaceae | Monocot |
| Canadian serviceberry | Amelanchier canadensis | AMCA4 | Rosaceae | Dicot |
| Canadian waterweed | Elodea canadensis | ELCA7 | Hydrocharitaceae | Monocot |
| Canadian white violet | Viola canadensis | VICA4 | Violaceae | Dicot |
| Canadian white violet | Viola canadensis var. canadensis | VICAC | Violaceae | Dicot |
| Canadian wildginger | Asarum canadense | ASCA | Aristolochiaceae | Dicot |
| Canadian woodnettle | Laportea canadensis | LACA3 | Urticaceae | Dicot |
| canary violet | Viola ×primulifolia | VIPR4 | Violaceae | Dicot |
| canarygrass | Phalaris | PHALA2 | Poaceae | Monocot |
| Canby"s bulrush | Schoenoplectus etuberculatus | SCET2 | Cyperaceae | Monocot |
| Canby"s cowbane | Oxypolis canbyi | OXCA2 | Apiaceae | Dicot |
| Canby"s lobelia | Lobelia canbyi | LOCA | Campanulaceae | Dicot |
| Canby"s mountain-lover | Paxistima canbyi | PACA | Celastraceae | Dicot |
| cancer-root | Conopholis | CONOP | Orobanchaceae | Dicot |
| cancerwort | Kickxia | KICKX | Scrophulariaceae | Dicot |
| cane | Arundinaria | ARUND2 | Poaceae | Monocot |
| cankerweed | Prenanthes serpentaria | PRSE | Asteraceae | Dicot |
| capsella | Capsella | CAPSE | Brassicaceae | Dicot |
| caraway | Carum carvi | CACA19 | Apiaceae | Dicot |
| cardinalflower | Lobelia cardinalis | LOCA2 | Campanulaceae | Dicot |
| carelessweed | Amaranthus palmeri | AMPA | Amaranthaceae | Dicot |
| Carey"s sedge | Carex careyana | CACA14 | Cyperaceae | Monocot |
| Carey"s smartweed | Polygonum careyi | POCA8 | Polygonaceae | Dicot |
| Carolina bristlemallow | Modiola caroliniana | MOCA | Malvaceae | Dicot |
| Carolina buckthorn | Frangula caroliniana | FRCA13 | Rhamnaceae | Dicot |
| Carolina bugbane | Trautvetteria caroliniensis | TRCA | Ranunculaceae | Dicot |
| Carolina bugbane | Trautvetteria caroliniensis var. caroliniensis | TRCAC2 | Ranunculaceae | Dicot |
| Carolina canarygrass | Phalaris caroliniana | PHCA6 | Poaceae | Monocot |
| Carolina dayflower | Commelina caroliniana | COCA17 | Commelinaceae | Monocot |
| Carolina desert-chicory | Pyrrhopappus carolinianus | PYCA2 | Asteraceae | Dicot |
| Carolina elephantsfoot | Elephantopus carolinianus | ELCA3 | Asteraceae | Dicot |
| Carolina fanwort | Cabomba caroliniana | CACA | Cabombaceae | Dicot |
| Carolina fanwort | Cabomba caroliniana var. caroliniana | CACAC4 | Cabombaceae | Dicot |
| Carolina fimbry | Fimbristylis caroliniana | FICA3 | Cyperaceae | Monocot |
| Carolina foxtail | Alopecurus carolinianus | ALCA4 | Poaceae | Monocot |
| Carolina geranium | Geranium carolinianum | GECA5 | Geraniaceae | Dicot |
| Carolina geranium | Geranium carolinianum var. carolinianum | GECAC4 | Geraniaceae | Dicot |
| Carolina horsenettle | Solanum carolinense | SOCA3 | Solanaceae | Dicot |
| Carolina horsenettle | Solanum carolinense var. carolinense | SOCAC4 | Solanaceae | Dicot |
| Carolina leaf-flower | Phyllanthus caroliniensis | PHCA9 | Euphorbiaceae | Dicot |
| Carolina leaf-flower | Phyllanthus caroliniensis ssp. caroliniensis | PHCAC | Euphorbiaceae | Dicot |
| Carolina mosquitofern | Azolla caroliniana | AZCA | Azollaceae | Fern |
| Carolina nutrush | Scleria pauciflora var. caroliniana | SCPAC | Cyperaceae | Monocot |
| Carolina ponysfoot | Dichondra carolinensis | DICA3 | Convolvulaceae | Dicot |
| Carolina poplar | Populus ×canadensis | POCA19 | Salicaceae | Dicot |
| Carolina redroot | Lachnanthes caroliana | LACA5 | Haemodoraceae | Monocot |
| Carolina rose | Rosa carolina | ROCA4 | Rosaceae | Dicot |
| Carolina rose | Rosa carolina var. carolina | ROCAC | Rosaceae | Dicot |
| Carolina sedge | Carex caroliniana | CACA15 | Cyperaceae | Monocot |
| Carolina springbeauty | Claytonia caroliniana | CLCA | Portulacaceae | Dicot |
| Carolina springbeauty | Claytonia caroliniana var. caroliniana | CLCAC | Portulacaceae | Dicot |
| Carolina vetch | Vicia caroliniana | VICA2 | Fabaceae | Dicot |
| Carolina wild petunia | Ruellia caroliniensis | RUCA4 | Acanthaceae | Dicot |
| Carolina wild petunia | Ruellia caroliniensis ssp. caroliniensis | RUCAC2 | Acanthaceae | Dicot |
| Carolina wild petunia | Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | RUCAC4 | Acanthaceae | Dicot |
| Carolina woodrush | Luzula acuminata ssp. carolinae | LUACC2 | Juncaceae | Monocot |
| Carolina yelloweyed grass | Xyris caroliniana | XYCA | Xyridaceae | Monocot |
| carpenter"s square | Scrophularia marilandica | SCMA2 | Scrophulariaceae | Dicot |
| carpetgrass | Axonopus | AXONO | Poaceae | Monocot |
| carpetweed | Mollugo | MOLLU | Molluginaceae | Dicot |
| carpgrass | Arthraxon | ARTHR | Poaceae | Monocot |
| Cartagena prairie clover | Dalea carthagenensis | DACA9 | Fabaceae | Dicot |
| carum | Carum | CARUM | Apiaceae | Dicot |
| castor aralia | Kalopanax | KALOP | Araliaceae | Dicot |
| castor aralia | Kalopanax septemlobus | KASE | Araliaceae | Dicot |
| castorbean | Ricinus communis | RICO3 | Euphorbiaceae | Dicot |
| cat greenbrier | Smilax glauca | SMGL | Smilacaceae | Monocot |
| cat"s ear | Hypochaeris | HYPOC | Asteraceae | Dicot |
| catalpa | Catalpa | CATAL | Bignoniaceae | Dicot |
| catberry | Ilex mucronata | ILMU | Aquifoliaceae | Dicot |
| catchfly | Silene | SILEN | Caryophyllaceae | Dicot |
| catchfly grass | Leersia lenticularis | LELE2 | Poaceae | Monocot |
| catnip | Nepeta | NEPET | Lamiaceae | Dicot |
| catnip | Nepeta cataria | NECA2 | Lamiaceae | Dicot |
| cattail | Typha | TYPHA | Typhaceae | Monocot |
| cattail sedge | Carex typhina | CATY | Cyperaceae | Monocot |
| cayenne pepper | Capsicum annuum | CAAN4 | Solanaceae | Dicot |
| cayenne pepper | Capsicum annuum var. annuum | CAANA4 | Solanaceae | Dicot |
| ceanothus | Ceanothus | CEANO | Rhamnaceae | Dicot |
| cedar | Chamaecyparis | CHAMA4 | Cupressaceae | Gymnosperm |
| celandine | Chelidonium | CHELI | Papaveraceae | Dicot |
| celandine | Chelidonium majus | CHMA2 | Papaveraceae | Dicot |
| celandine | Chelidonium majus var. majus | CHMAM | Papaveraceae | Dicot |
| celandine poppy | Stylophorum diphyllum | STDI3 | Papaveraceae | Dicot |
| centaury | Centaurium | CENTA2 | Gentianaceae | Dicot |
| centella | Centella | CENTE | Apiaceae | Dicot |
| cereal rye | Secale cereale | SECE | Poaceae | Monocot |
| chaff flower | Achyranthes | ACHYR2 | Amaranthaceae | Dicot |
| chaffseed | Schwalbea americana | SCAM | Scrophulariaceae | Dicot |
| chaffweed | Anagallis minima | ANMI4 | Primulaceae | Dicot |
| chainfern | Woodwardia | WOODW | Blechnaceae | Fern |
| chairmaker"s bulrush | Schoenoplectus americanus | SCAM6 | Cyperaceae | Monocot |
| chamaelirium | Chamaelirium | CHAMA6 | Liliaceae | Monocot |
| chamomile | Anthemis | ANTHE | Asteraceae | Dicot |
| changing forget-me-not | Myosotis discolor | MYDI | Boraginaceae | Dicot |
| Chapman"s bluegrass | Poa chapmaniana | POCH2 | Poaceae | Monocot |
| charlock mustard | Sinapis arvensis | SIAR4 | Brassicaceae | Dicot |
| chastetree | Vitex | VITEX | Verbenaceae | Dicot |
| cheatgrass | Bromus tectorum | BRTE | Poaceae | Monocot |
| checkered rattlesnake plantain | Goodyera tesselata | GOTE | Orchidaceae | Monocot |
| cheerful sunflower | Helianthus ×laetiflorus | HELA | Asteraceae | Dicot |
| cheeseweed mallow | Malva parviflora | MAPA5 | Malvaceae | Dicot |
| cherry silverberry | Elaeagnus multiflora | ELMU | Elaeagnaceae | Dicot |
| cherrybark oak | Quercus pagoda | QUPA5 | Fagaceae | Dicot |
| chervil | Chaerophyllum | CHAER | Apiaceae | Dicot |
| chervil | Anthriscus | ANTHR | Apiaceae | Dicot |
| Chesapeake blackberry | Rubus pascuus | RUPA11 | Rosaceae | Dicot |
| Chesapeake panicgrass | Panicum paludosum | PAPA35 | Poaceae | Monocot |
| chestnut | Castanea | CASTA | Fagaceae | Dicot |
| chestnut | Castanea ×neglecta | CANE7 | Fagaceae | Dicot |
| chestnut oak | Quercus montana | QUMO4 | Fagaceae | Dicot |
| chick pea | Cicer arietinum | CIAR5 | Fabaceae | Dicot |
| Chickasaw plum | Prunus angustifolia | PRAN3 | Rosaceae | Dicot |
| Chickasaw plum | Prunus angustifolia var. angustifolia | PRANA | Rosaceae | Dicot |
| chicory | Cichorium | CICHO | Asteraceae | Dicot |
| chicory | Cichorium intybus | CIIN | Asteraceae | Dicot |
| childing pink | Petrorhagia prolifera | PEPR4 | Caryophyllaceae | Dicot |
| China violet | Viola patrinii | VIPA17 | Violaceae | Dicot |
| Chinese catalpa | Catalpa ovata | CAOV5 | Bignoniaceae | Dicot |
| Chinese chastetree | Vitex negundo | VINE2 | Verbenaceae | Dicot |
| Chinese chastetree | Vitex negundo var. heterophylla | VINEH | Verbenaceae | Dicot |
| Chinese desert-thorn | Lycium chinense | LYCH | Solanaceae | Dicot |
| Chinese elm | Ulmus parvifolia | ULPA | Ulmaceae | Dicot |
| Chinese grass | Boehmeria nivea | BONI2 | Urticaceae | Dicot |
| Chinese lovegrass | Eragrostis unioloides | ERUN | Poaceae | Monocot |
| Chinese parasoltree | Firmiana simplex | FISI2 | Sterculiaceae | Dicot |
| Chinese pear | Pyrus pyrifolia | PYPY2 | Rosaceae | Dicot |
| Chinese privet | Ligustrum sinense | LISI | Oleaceae | Dicot |
| Chinese silvergrass | Miscanthus sinensis | MISI | Poaceae | Monocot |
| Chinese thorn-apple | Datura quercifolia | DAQU | Solanaceae | Dicot |
| Chinese wisteria | Wisteria sinensis | WISI | Fabaceae | Dicot |
| Chinese yam | Dioscorea oppositifolia | DIOP | Dioscoreaceae | Monocot |
| chinkapin | Castanea pumila | CAPU9 | Fagaceae | Dicot |
| chinkapin | Castanea pumila var. pumila | CAPUP3 | Fagaceae | Dicot |
| chinkapin oak | Quercus muehlenbergii | QUMU | Fagaceae | Dicot |
| chocolate vine | Akebia | AKEBI | Lardizabalaceae | Dicot |
| chocolate vine | Akebia quinata | AKQU | Lardizabalaceae | Dicot |
| chocolateweed | Melochia corchorifolia | MECO4 | Sterculiaceae | Dicot |
| chokeberry | Photinia | PHOTI | Rosaceae | Dicot |
| chokecherry | Prunus virginiana | PRVI | Rosaceae | Dicot |
| chokecherry | Prunus virginiana var. virginiana | PRVIV | Rosaceae | Dicot |
| chondrilla | Chondrilla | CHOND | Asteraceae | Dicot |
| Christmas fern | Polystichum acrostichoides | POAC4 | Dryopteridaceae | Fern |
| Christmas fern | Polystichum acrostichoides var. acrostichoides | POACA | Dryopteridaceae | Fern |
| Christmas grass | Themeda arguens | THAR2 | Poaceae | Monocot |
| chrozophora | Chrozophora | CHROZ | Euphorbiaceae | Dicot |
| chrysogonum | Chrysogonum | CHRYS4 | Asteraceae | Dicot |
| churchmouse threeawn | Aristida dichotoma | ARDI4 | Poaceae | Monocot |
| churchmouse threeawn | Aristida dichotoma var. dichotoma | ARDID | Poaceae | Monocot |
| cicer | Cicer | CICER | Fabaceae | Dicot |
| cinnamon fern | Osmunda cinnamomea | OSCI | Osmundaceae | Fern |
| cinnamon fern | Osmunda cinnamomea var. cinnamomea | OSCIC | Osmundaceae | Fern |
| cinnamon fern | Osmunda cinnamomea var. glandulosa | OSCIG | Osmundaceae | Fern |
| cinquefoil | Potentilla | POTEN | Rosaceae | Dicot |
| city goosefoot | Chenopodium urbicum | CHUR | Chenopodiaceae | Dicot |
| clammy groundcherry | Physalis heterophylla | PHHE5 | Solanaceae | Dicot |
| clammy groundcherry | Physalis heterophylla var. heterophylla | PHHEH3 | Solanaceae | Dicot |
| clammy hedgehyssop | Gratiola neglecta | GRNE | Scrophulariaceae | Dicot |
| clammy locust | Robinia viscosa | ROVI | Fabaceae | Dicot |
| clammy locust | Robinia viscosa var. viscosa | ROVIV | Fabaceae | Dicot |
| clammyweed | Polanisia | POLAN | Capparaceae | Dicot |
| clasping milkweed | Asclepias amplexicaulis | ASAM | Asclepiadaceae | Dicot |
| clasping pepperweed | Lepidium perfoliatum | LEPE2 | Brassicaceae | Dicot |
| clasping Venus" looking-glass | Triodanis perfoliata | TRPE4 | Campanulaceae | Dicot |
| clasping water horehound | Lycopus amplectens | LYAM2 | Lamiaceae | Dicot |
| claspingleaf pondweed | Potamogeton perfoliatus | POPE7 | Potamogetonaceae | Monocot |
| claspingleaf St. Johnswort | Hypericum gymnanthum | HYGY | Clusiaceae | Dicot |
| claspleaf pennycress | Microthlaspi perfoliatum | MIPE8 | Brassicaceae | Dicot |
| claspleaf twistedstalk | Streptopus amplexifolius | STAM2 | Liliaceae | Monocot |
| claspleaf twistedstalk | Streptopus amplexifolius var. amplexifolius | STAMA2 | Liliaceae | Monocot |
| Clayton"s sweetroot | Osmorhiza claytonii | OSCL | Apiaceae | Dicot |
| clearweed | Pilea | PILEA | Urticaceae | Dicot |
| cliff fern | Woodsia | WOODS | Dryopteridaceae | Fern |
| cliff stonecrop | Sedum glaucophyllum | SEGL3 | Crassulaceae | Dicot |
| cliffbrake | Pellaea | PELLA | Pteridaceae | Fern |
| climbing dayflower | Commelina diffusa | CODI5 | Commelinaceae | Monocot |
| climbing dayflower | Commelina diffusa var. diffusa | CODID3 | Commelinaceae | Monocot |
| climbing dogbane | Trachelospermum difforme | TRDI | Apocynaceae | Dicot |
| climbing false buckwheat | Polygonum scandens | POSC3 | Polygonaceae | Dicot |
| climbing false buckwheat | Polygonum scandens var. cristatum | POSCC | Polygonaceae | Dicot |
| climbing false buckwheat | Polygonum scandens var. dumetorum | POSCD | Polygonaceae | Dicot |
| climbing false buckwheat | Polygonum scandens var. scandens | POSCS | Polygonaceae | Dicot |
| climbing fern | Lygodium | LYGOD2 | Lygodiaceae | Fern |
| climbing hempvine | Mikania scandens | MISC | Asteraceae | Dicot |
| climbing milkvine | Matelea obliqua | MAOB2 | Asclepiadaceae | Dicot |
| climbing nightshade | Solanum dulcamara | SODU | Solanaceae | Dicot |
| climbing nightshade | Solanum dulcamara var. dulcamara | SODUD | Solanaceae | Dicot |
| climbing rose | Rosa setigera | ROSE2 | Rosaceae | Dicot |
| climbing rose | Rosa setigera var. tomentosa | ROSET | Rosaceae | Dicot |
| Clingman"s hedgenettle | Stachys clingmanii | STCL | Lamiaceae | Dicot |
| clinopodium | Clinopodium | CLINO | Lamiaceae | Dicot |
| closed bottle gentian | Gentiana andrewsii | GEAN | Gentianaceae | Dicot |
| closed bottle gentian | Gentiana andrewsii var. andrewsii | GEANA | Gentianaceae | Dicot |
| clover | Trifolium | TRIFO | Fabaceae | Dicot |
| clover dodder | Cuscuta epithymum | CUEP | Cuscutaceae | Dicot |
| clubmoss | Huperzia | HUPER | Lycopodiaceae | Lycopod |
| clubmoss | Lycopodiella | LYCOP6 | Lycopodiaceae | Lycopod |
| clubmoss | Lycopodiella ×copelandii | LYCO8 | Lycopodiaceae | Lycopod |
| clubmoss | Lycopodium | LYCOP2 | Lycopodiaceae | Lycopod |
| cluster mallow | Malva verticillata | MAVE | Malvaceae | Dicot |
| clustered beaksedge | Rhynchospora glomerata | RHGL3 | Cyperaceae | Monocot |
| clustered blacksnakeroot | Sanicula odorata | SAOD | Apiaceae | Dicot |
| clustered fescue | Festuca paradoxa | FEPA2 | Poaceae | Monocot |
| clustered mille graines | Oldenlandia uniflora | OLUN | Rubiaceae | Dicot |
| clustered mountainmint | Pycnanthemum muticum | PYMU | Lamiaceae | Dicot |
| clustered yellowtops | Flaveria trinervia | FLTR | Asteraceae | Dicot |
| cnicus | Cnicus | CNICU | Asteraceae | Dicot |
| coast cockspur grass | Echinochloa walteri | ECWA | Poaceae | Monocot |
| coast tarweed | Madia sativa | MASA | Asteraceae | Dicot |
| coastal bedstraw | Galium hispidulum | GAHI | Rubiaceae | Dicot |
| coastal false asphodel | Triantha racemosa | TRRA6 | Liliaceae | Monocot |
| coastal jointweed | Polygonella articulata | POAR4 | Polygonaceae | Dicot |
| coastal lovegrass | Eragrostis refracta | ERRE | Poaceae | Monocot |
| coastal panicgrass | Panicum amarum var. amarulum | PAAMA2 | Poaceae | Monocot |
| coastal plain blue-eyed grass | Sisyrinchium fuscatum | SIFU2 | Iridaceae | Monocot |
| coastal plain joe pye weed | Eutrochium dubium | EUDU6 | Asteraceae | Dicot |
| coastal plain panicgrass | Dichanthelium longiligulatum | DILO4 | Poaceae | Monocot |
| coastal plain willow | Salix caroliniana | SACA5 | Salicaceae | Dicot |
| coastal sandbur | Cenchrus spinifex | CESP4 | Poaceae | Monocot |
| coastal sedge | Carex exilis | CAEX7 | Cyperaceae | Monocot |
| coastal serviceberry | Amelanchier obovalis | AMOB2 | Rosaceae | Dicot |
| coastal sweetpepperbush | Clethra alnifolia | CLAL3 | Clethraceae | Dicot |
| cock"s comb | Celosia | CELOS | Amaranthaceae | Dicot |
| cocklebur | Xanthium | XANTH2 | Asteraceae | Dicot |
| cockspur grass | Echinochloa | ECHIN4 | Poaceae | Monocot |
| cockspur hawthorn | Crataegus crus-galli | CRCR2 | Rosaceae | Dicot |
| codlins and cream | Epilobium hirsutum | EPHI | Onagraceae | Dicot |
| coffeetree | Gymnocladus | GYMNO2 | Fabaceae | Dicot |
| cohosh | Caulophyllum | CAULO | Berberidaceae | Dicot |
| colchicum | Colchicum | COLCH | Liliaceae | Monocot |
| Cold Spring blackberry | Rubus originalis | RUOR4 | Rosaceae | Dicot |
| colicroot | Aletris | ALETR | Liliaceae | Monocot |
| Collins" sedge | Carex collinsii | CACO21 | Cyperaceae | Monocot |
| colonial bentgrass | Agrostis capillaris | AGCA5 | Poaceae | Monocot |
| coltsfoot | Tussilago | TUSSI | Asteraceae | Dicot |
| coltsfoot | Tussilago farfara | TUFA | Asteraceae | Dicot |
| Columbian watermeal | Wolffia columbiana | WOCO | Lemnaceae | Monocot |
| columbine | Aquilegia | AQUIL | Ranunculaceae | Dicot |
| combleaf mermaidweed | Proserpinaca pectinata | PRPE | Haloragaceae | Dicot |
| Combs" panicgrass | Panicum rigidulum var. combsii | PARIC | Poaceae | Monocot |
| comfrey | Symphytum | SYMPH2 | Boraginaceae | Dicot |
| common balm | Melissa officinalis | MEOF2 | Lamiaceae | Dicot |
| common barberry | Berberis vulgaris | BEVU | Berberidaceae | Dicot |
| common barley | Hordeum vulgare | HOVU | Poaceae | Monocot |
| common bladderwort | Utricularia macrorhiza | UTMA | Lentibulariaceae | Dicot |
| common blue violet | Viola sororia | VISO | Violaceae | Dicot |
| common blue wood aster | Symphyotrichum cordifolium | SYCO4 | Asteraceae | Dicot |
| common boneset | Eupatorium perfoliatum | EUPE3 | Asteraceae | Dicot |
| common boneset | Eupatorium perfoliatum var. perfoliatum | EUPEP | Asteraceae | Dicot |
| common borage | Borago officinalis | BOOF | Boraginaceae | Dicot |
| common buckthorn | Rhamnus cathartica | RHCA3 | Rhamnaceae | Dicot |
| common bugle | Ajuga reptans | AJRE | Lamiaceae | Dicot |
| common buttonbush | Cephalanthus occidentalis | CEOC2 | Rubiaceae | Dicot |
| common chickweed | Stellaria media | STME2 | Caryophyllaceae | Dicot |
| common chickweed | Stellaria media ssp. media | STMEM | Caryophyllaceae | Dicot |
| common cinquefoil | Potentilla simplex | POSI2 | Rosaceae | Dicot |
| common comfrey | Symphytum officinale | SYOF | Boraginaceae | Dicot |
| common corncockle | Agrostemma githago | AGGI | Caryophyllaceae | Dicot |
| common cottonrose | Filago vulgaris | FIVU2 | Asteraceae | Dicot |
| common cowparsnip | Heracleum maximum | HEMA80 | Apiaceae | Dicot |