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Plant List
Indexed Alphabetically by Common Name
B
For a list of plants indexed by Scientific Name, click here
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| National Common Name | Scientific Name with Author | Symbol | Family | |
| babybonnets | Coursetia DC. | COURS | Fabaceae | |
| baccaurea | Baccaurea Lour. | BACCA | Euphorbiaceae | |
| baccaurea | Baccaurea ramiflora Lour. | BARA4 | Euphorbiaceae | |
| baccharis | Baccharis L. | BACCH | Asteraceae | |
| bachmanniomyces lichen | Bachmanniomyces D. Hawksw. | BACHM | Uncertain Lichen Family | |
| bachmanniomyces lichen | Bachmanniomyces uncialicola (Zopf) D. Hawksw. | BAUN5 | Uncertain Lichen Family | |
| Bachman's jelly lichen | Collema bachmanianum (Fink) Degel. | COBA8 | Collemataceae | |
| Backhous fuchsia | Correa backhousiana Hook. | COBA13 | Rutaceae | |
| Back's sedge | Carex backii Boott | CABA3 | Cyperaceae | |
| bactris palm | Bactris Jacq. ex Scop. | BACTR2 | Arecaceae | |
| bactrospora lichen | Bactrospora A. Massal. | BACTR | Opegraphaceae | |
| bactrospora lichen | Bactrospora dryina (Ach.) A. Massal. | BADR | Opegraphaceae | |
| bactrospora lichen | Bactrospora patellarioides (Nyl.) Vainio | BAPA6 | Opegraphaceae | |
| baeckea | Baeckea frutescens L. | BAFR4 | Myrtaceae | |
| baeckea | Baeckea L. | BAECK | Myrtaceae | |
| bagflower | Clerodendrum thompsoniae Balf. f. | CLTH | Verbenaceae | |
| Baglietto'a dotted lichen | Bacidia bagliettoana (A. Massal. & De Not.) Jatta | BABA3 | Bacidiaceae | |
| Bahama baybean | Canavalia nitida (Cav.) Piper | CANI7 | Fabaceae | |
| Bahama manjack | Cordia bahamensis Urban | COBA4 | Boraginaceae | |
| Bahama pigeonplum | Coccoloba tenuifolia L. | COTE9 | Polygonaceae | |
| bahia | Bahia Lag. | BAHIA | Asteraceae | |
| Bahia piassaba palm | Attalea funifera C. Martius ex Sprengel | ATFU | Arecaceae | |
| Baikal sedge | Carex sabulosa Turcz. ex Kunth | CASA5 | Cyperaceae | |
| Bailey's rabbitbrush | Chrysothamnus baileyi Woot. & Standl. | CHBA11 | Asteraceae | |
| Bailey's sedge | Carex baileyi Britt. | CABA7 | Cyperaceae | |
| baillonella | Baillonella Pierre | BAILL | Sapotaceae | |
| Baker's cryptantha | Cryptantha bakeri (Greene) Payson | CRBA4 | Boraginaceae | |
| Baker's hawksbeard | Crepis bakeri Greene | CRBA2 | Asteraceae | |
| Baker's hawksbeard | Crepis bakeri Greene ssp. bakeri | CRBAB | Asteraceae | |
| Baker's manzanita | Arctostaphylos bakeri Eastw. | ARBA4 | Ericaceae | |
| Baker's manzanita | Arctostaphylos bakeri Eastw. ssp. bakeri | ARBAB | Ericaceae | |
| Baker's stickyseed | Blennosperma bakeri Heiser | BLBA | Asteraceae | |
| balanites | Balanites Del. | BALAN | Zygophyllaceae | |
| bald brome | Bromus racemosus L. | BRRA2 | Poaceae | |
| Bald Mountain milkvetch | Astragalus umbraticus Sheldon | ASUM3 | Fabaceae | |
| Baldwin's flatsedge | Cyperus croceus Vahl | CYCR6 | Cyperaceae | |
| ball saltbush | Atriplex fruticulosa Jepson | ATFR | Chenopodiaceae | |
| ballhead sandwort | Arenaria congesta Nutt. | ARCO5 | Caryophyllaceae | |
| ballhead sandwort | Arenaria congesta Nutt. var. congesta | ARCOC4 | Caryophyllaceae | |
| ballhead sandwort | Arenaria congesta Nutt. var. crassula Maguire | ARCOC3 | Caryophyllaceae | |
| ballhead sandwort | Arenaria congesta Nutt. var. prolifera Maguire | ARCOP | Caryophyllaceae | |
| ballhead sandwort | Arenaria congesta Nutt. var. simulans Maguire | ARCOS | Caryophyllaceae | |
| ballmustard | Calepina Adans. | CALEP | Brassicaceae | |
| balloonplant | Asclepias physocarpa (E. Mey.) Schlechter | ASPH2 | Asclepiadaceae | |
| balloonpod milkvetch | Astragalus whitneyi Gray | ASWH | Fabaceae | |
| balloonpod milkvetch | Astragalus whitneyi Gray var. lenophyllus (Rydb.) Barneby | ASWHL | Fabaceae | |
| balloonpod milkvetch | Astragalus whitneyi Gray var. sonneanus (Greene) Jepson | ASWHS2 | Fabaceae | |
| balloonpod milkvetch | Astragalus whitneyi Gray var. whitneyi | ASWHW | Fabaceae | |
| balloonvine | Cardiospermum L. | CARDI2 | Sapindaceae | |
| balsam fir | Abies balsamea (L.) P. Mill. | ABBA | Pinaceae | |
| balsam fir | Abies balsamea (L.) P. Mill. var. balsamea | ABBAB | Pinaceae | |
| balsam torchwood | Amyris balsamifera L. | AMBA2 | Rutaceae | |
| balsam tree | Colophospermum mopane (Kirk ex Benth.) Kirk ex J. Léonard | COMO14 | Fabaceae | |
| balsam-leaf calycera | Calycera balsamitifolia A. Rich. | CABA22 | Calyceraceae | |
| balsamo | Bulnesia sarmienti Lorentz ex Griseb. | BUSA6 | Zygophyllaceae | |
| balsamroot | Balsamorhiza Nutt. | BALSA | Asteraceae | |
| baltimora | Baltimora L. | BALTI | Asteraceae | |
| Baltzell's sedge | Carex baltzellii Chapman ex Dewey | CABA8 | Cyperaceae | |
| bamboo | Bambusa arundinacea (Retz.) Willd. | BAAR8 | Poaceae | |
| bamboo | Bambusa longispiculata Gamble ex Brandis | BALO4 | Poaceae | |
| bamboo | Bambusa Schreb. | BAMBU | Poaceae | |
| bamboo | Bambusa tulda Roxb. | BATU | Poaceae | |
| bamboo orchid | Arundina Blume | ARUND | Orchidaceae | |
| bamboo orchid | Arundina graminifolia (D. Don) Hochr. | ARGR6 | Orchidaceae | |
| bandanna of the Everglades | Canna flaccida Salisb. | CAFL11 | Cannaceae | |
| baneberry | Actaea L. | ACTAE | Ranunculaceae | |
| baneberry | Actaea spicata L. | ACSP10 | Ranunculaceae | |
| banisteriopsis | Banisteriopsis C.B. Robins. ex Small | BANIS | Malpighiaceae | |
| bank catclaw | Acacia redolens Maslin | ACRE9 | Fabaceae | |
| banksia | Banksia L. f., nom. cons. | BANKS | Proteaceae | |
| baobab | Adansonia digitata L. | ADDI3 | Bombacaceae | |
| baphia | Baphia Lodd. | BAPHI | Fabaceae | |
| Barbados aloe | Aloe vera (L.) Burm. f. | ALVE2 | Aloaceae | |
| barbas de indio | Andropogon bicornis L. | ANBI | Poaceae | |
| barbed goatgrass | Aegilops triuncialis L. | AETR | Poaceae | |
| barbella moss | Barbella Fleisch. in Broth. | BARBE | Meteoriaceae | |
| barberry | Berberis L. | BERBE | Berberidaceae | |
| barberry hawthorn | Crataegus berberifolia Torr. & Gray | CRBE2 | Rosaceae | |
| Barber's hawksbeard | Crepis runcinata (James) Torr. & Gray ssp. barberi (Greenm.) Babcock & Stebbins | CRRUB | Asteraceae | |
| barbieria | Barbieria DC. | BARBI | Fabaceae | |
| barbula moss | Barbula agraria Hedw. | BAAG | Pottiaceae | |
| barbula moss | Barbula amplexifolia (Mitt.) Jaeg. | BAAM3 | Pottiaceae | |
| barbula moss | Barbula coreensis (Card.) Saito | BACO3 | Pottiaceae | |
| barbula moss | Barbula eustegia Card. & Thér. | BAEU | Pottiaceae | |
| barbula moss | Barbula Hedw. | BARBU2 | Pottiaceae | |
| barbula moss | Barbula indica (Hook.) Spreng. in Steud. | BAIN9 | Pottiaceae | |
| barbula moss | Barbula indica (Hook.) Spreng. in Steud. var. gregaria (Mitt.) Zand. | BAING | Pottiaceae | |
| barbula moss | Barbula indica (Hook.) Spreng. in Steud. var. indica | BAINI | Pottiaceae | |
| barbula moss | Barbula unguiculata Hedw. | BAUN6 | Pottiaceae | |
| barbwire grass | Cymbopogon refractus (R. Br.) A. Camus | CYRE | Poaceae | |
| barleriola | Barleriola Oerst. | BARLE2 | Acanthaceae | |
| barley Mitchell grass | Astrebla pectinata (Lindl.) F. Muell. [excluded] | ASPE20 | Poaceae | |
| Barneby's Indian paintbrush | Castilleja scabrida Eastw. var. barnebyana (Eastw.) N. Holmgren | CASCB3 | Scrophulariaceae | |
| Barneby's thistle | Cirsium barnebyi Welsh & Neese | CIBA | Asteraceae | |
| barranca brush | Ceanothus verrucosus Nutt. | CEVE2 | Rhamnaceae | |
| Barratt's sedge | Carex barrattii Schwein. & Torr. | CABA9 | Cyperaceae | |
| Barrelier's bugloss | Anchusa barrelieri (All.) Vitman | ANBA3 | Boraginaceae | |
| barren milkvetch | Astragalus cusickii Gray var. sterilis (Barneby) Barneby | ASCUS2 | Fabaceae | |
| Barren Valley collomia | Collomia renacta E. Joyal | CORE10 | Polemoniaceae | |
| Barrier Range wattle | Acacia beckleri Tindale | ACBE6 | Fabaceae | |
| barringtonia | Barringtonia J.R. & G. Forst | BARRI | Lecythidaceae | |
| Barr's milkvetch | Astragalus barrii Barneby | ASBA | Fabaceae | |
| Bartlett daisy | Bartlettia scaposa Gray | BASC | Asteraceae | |
| bartlettia | Bartlettia Gray | BARTL | Asteraceae | |
| bartlettina | Bartlettina R.M. King & H. Robinson | BARTL2 | Asteraceae | |
| bartramia moss | Bartramia glauca Lor. | BAGL5 | Bartramiaceae | |
| bartramia moss | Bartramia Hedw. | BARTR2 | Bartramiaceae | |
| bartramia moss | Bartramia ithyphylla Brid. | BAIT70 | Bartramiaceae | |
| bartramia moss | Bartramia microstoma Mitt. | BAMI8 | Bartramiaceae | |
| bartramia moss | Bartramia pomiformis Hedw. | BAPO70 | Bartramiaceae | |
| bartramia moss | Bartramia stricta Brid. | BAST6 | Bartramiaceae | |
| bartramia moss | Bartramia subulata Bruch & Schimp. in B.S.G. | BASU6 | Bartramiaceae | |
| bartramidula moss | Bartramidula Bruch & Schimp. in B.S.G. | BARTR4 | Bartramiaceae | |
| bartramiopsis moss | Bartramiopsis Kindb. | BARTR3 | Polytrichaceae | |
| Bartram's ixia | Calydorea coelestina (Bartr.) Goldblatt & Henrich | CACO72 | Iridaceae | |
| basalt milkvetch | Astragalus filipes Torr. ex Gray | ASFI | Fabaceae | |
| basalt springparsley | Cymopterus basalticus M.E. Jones | CYBA3 | Apiaceae | |
| basella | Basella L. | BASEL | Basellaceae | |
| basil thyme | Acinos arvensis (Lam.) Dandy | ACAR2 | Lamiaceae | |
| basin bellflower | Campanula reverchonii Gray | CARE3 | Campanulaceae | |
| basin big sagebrush | Artemisia tridentata Nutt. ssp. tridentata | ARTRT | Asteraceae | |
| basin cryptantha | Cryptantha ambigua (Gray) Greene | CRAM3 | Boraginaceae | |
| basin saltbush | Atriplex tridentata Kuntze | ATTR3 | Chenopodiaceae | |
| basin yellow cryptantha | Cryptantha confertiflora (Greene) Payson | CRCO12 | Boraginaceae | |
| basiphyllaea | Basiphyllaea Schlechter | BASIP | Orchidaceae | |
| basket of gold | Aurinia saxatilis (L.) Desv. | AUSA | Brassicaceae | |
| basketplant | Callisia fragrans (Lindl.) Woods. | CAFR6 | Commelinaceae | |
| basora | Cordia angustifolia (West ex Willd.) Roemer & J.A. Schultes | COAN11 | Boraginaceae | |
| bastard copperleaf | Acalypha chamaedryfolia (Lam.) Muell.-Arg. | ACCH2 | Euphorbiaceae | |
| bastard draba milkvetch | Astragalus drabelliformis Barneby | ASDR2 | Fabaceae | |
| bastard milkvetch | Astragalus tegetarioides M.E. Jones | ASTE4 | Fabaceae | |
| bastard mulga | Acacia stowardii Maiden | ACST8 | Fabaceae | |
| bastard redwood | Chrysophyllum argenteum Jacq. | CHAR6 | Sapotaceae | |
| bastard toadflax | Comandra Nutt. | COMAN | Santalaceae | |
| bastard toadflax | Comandra umbellata (L.) Nutt. | COUM | Santalaceae | |
| bastard toadflax | Comandra umbellata (L.) Nutt. ssp. umbellata | COUMU | Santalaceae | |
| bastardia | Bastardia Kunth | BASTA | Malvaceae | |
| Batesburg hawthorn | Crataegus munda Beadle | CRMU4 | Rosaceae | |
| bats in the belfry | Campanula trachelium L. | CATR4 | Campanulaceae | |
| Bauer's anacolia moss | Anacolia menziesii (Turn.) Par. var. baueri (Hampe) Flow. | ANMEB | Bartramiaceae | |
| bauhinia | Bauhinia fassoglensis Kotschy ex Schweinf. | BAFA | Fabaceae | |
| bauhinia | Bauhinia L. | BAUHI | Fabaceae | |
| Bay County Indian plaintain | Arnoglossum album L.C. Anders. | ARAL30 | Asteraceae | |
| baybean | Canavalia rosea (Sw.) DC. | CARO26 | Fabaceae | |
| beach false foxglove | Agalinis fasciculata (Ell.) Raf. | AGFA2 | Scrophulariaceae | |
| beach saltbush | Atriplex leucophylla (Moq.) D. Dietr. | ATLE2 | Chenopodiaceae | |
| beach sand verbena | Abronia neurophylla Standl. | ABNE | Nyctaginaceae | |
| beach sandmat | Chamaesyce degeneri (Sherff) Croizat & Deg. | CHDE6 | Euphorbiaceae | |
| beach sedge | Carex silicea Olney | CASI6 | Cyperaceae | |
| beach sensitive pea | Chamaecrista chamaecristoides (Colladon) Greene | CHCH3 | Fabaceae | |
| beach sensitive pea | Chamaecrista chamaecristoides (Colladon) Greene var. cruziana (Britt. & Rose) Irwin & Barneby | CHCHC | Fabaceae | |
| beach sheoak | Casuarina equisetifolia L. | CAEQ | Casuarinaceae | |
| beach suncup | Camissonia cheiranthifolia (Hornem. ex Spreng.) Raimann | CACH13 | Onagraceae | |
| beach suncup | Camissonia cheiranthifolia (Hornem. ex Spreng.) Raimann ssp. cheiranthifolia | CACHC | Onagraceae | |
| beach suncup | Camissonia cheiranthifolia (Hornem. ex Spreng.) Raimann ssp. suffruticosa (S. Wats.) Raven | CACHS | Onagraceae | |
| beach wormwood | Artemisia pycnocephala (Less.) DC. | ARPY3 | Asteraceae | |
| beachgrass | Ammophila Host | AMMOP | Poaceae | |
| beaded lipfern | Cheilanthes wootonii Maxon | CHWO | Pteridaceae | |
| Beadle's hawthorn | Crataegus beadlei Ashe | CRBE5 | Rosaceae | |
| beadtree | Adenanthera L. | ADENA | Fabaceae | |
| beaked agrimony | Agrimonia rostellata Wallr. | AGRO3 | Rosaceae | |
| beaked clarkia | Clarkia rostrata W.S. Davis | CLRO2 | Onagraceae | |
| beaked dodder | Cuscuta rostrata Shuttlw. ex Engelm. & Gray | CURO | Cuscutaceae | |
| beaked hawksbeard | Crepis vesicaria L. | CRVE3 | Asteraceae | |
| beaked hawksbeard | Crepis vesicaria L. ssp. taraxacifolia (Thuill.) Thellung | CRVET | Asteraceae | |
| beaked hazelnut | Corylus cornuta Marsh. | COCO6 | Betulaceae | |
| beaked hazelnut | Corylus cornuta Marsh. var. cornuta | COCOC2 | Betulaceae | |
| beaked sedge | Carex rostrata Stokes | CARO6 | Cyperaceae | |
| beaked snailfern | Cochlidium rostratum (Hook.) Maxon ex C. Christens. | CORO4 | Grammitidaceae | |
| bear garlic | Allium ursinum L. | ALUR | Liliaceae | |
| Bear Mountain milkweed | Asclepias scaposa Vail | ASSC9 | Asclepiadaceae | |
| bear sedge | Carex ursina Dewey | CAUR | Cyperaceae | |
| Bear Valley milkvetch | Astragalus leucolobus S. Wats. ex M.E. Jones | ASLE11 | Fabaceae | |
| Bear Valley sandwort | Arenaria ursina B.L. Robins. | ARUR | Caryophyllaceae | |
| bearded beggarticks | Bidens aristosa (Michx.) Britt. | BIAR | Asteraceae | |
| bearded cryptantha | Cryptantha barbigera (Gray) Greene | CRBA5 | Boraginaceae | |
| bearded flatsedge | Cyperus squarrosus L. | CYSQ | Cyperaceae | |
| bearded grasspink | Calopogon barbatus (Walt.) Ames | CABA | Orchidaceae | |
| bearded milkvetch | Astragalus villosus Michx. | ASVI6 | Fabaceae | |
| bearded shorthusk | Brachyelytrum erectum (Schreb. ex Spreng.) Beauv. | BRER2 | Poaceae | |
| bearded swallow-wort | Cynanchum barbigerum (Scheele) Shinners | CYBA | Asclepiadaceae | |
| beardgrass | Bothriochloa Kuntze | BOTHR | Poaceae | |
| bearpoppy | Arctomecon Torr. & Frém. | ARCTO | Papaveraceae | |
| bear's breech | Acanthus mollis L. | ACMO8 | Acanthaceae | |
| Beath's milkvetch | Astragalus beathii C.L. Porter | ASBE2 | Fabaceae | |
| Beatley's milkvetch | Astragalus beatleyae Barneby | ASBE5 | Fabaceae | |
| Beaumont's cup lichen | Cladonia beaumontii (Tuck.) Vainio | CLBE3 | Cladoniaceae | |
| beautiful hawthorn | Crataegus pulcherrima Ashe | CRPU9 | Rosaceae | |
| beautiful Indian paintbrush | Castilleja pulchella Rydb. | CAPU10 | Scrophulariaceae | |
| beautiful rockcress | Arabis pulchra M.E. Jones ex S. Wats. | ARPU2 | Brassicaceae | |
| beautiful rockcress | Arabis pulchra M.E. Jones ex S. Wats. var. gracilis M.E. Jones | ARPUG | Brassicaceae | |
| beautiful rockcress | Arabis pulchra M.E. Jones ex S. Wats. var. pallens M.E. Jones | ARPUP | Brassicaceae | |
| beautiful rockcress | Arabis pulchra M.E. Jones ex S. Wats. var. pulchra | ARPUP2 | Brassicaceae | |
| beautyberry | Callicarpa L. | CALLI2 | Verbenaceae | |
| beautyhead | Baltimora recta L. | BARE2 | Asteraceae | |
| beavertail grass | Calochortus caeruleus (Kellogg) S. Wats. | CACA98 | Liliaceae | |
| Bebb's sedge | Carex bebbii Olney ex Fern. | CABE2 | Cyperaceae | |
| Beckett's water trumpet | Cryptocoryne beckettii Thwaites ex Trimen. | CRBE10 | Araceae | |
| Beckhaus' dotted lichen | Bacidia beckhausii Korber | BABE | Bacidiaceae | |
| Beck's watermarigold | Bidens beckii Torr. ex Spreng. | BIBE2 | Asteraceae | |
| Beckwith's milkvetch | Astragalus beckwithii Torr. & Gray | ASBE3 | Fabaceae | |
| Beckwith's milkvetch | Astragalus beckwithii Torr. & Gray var. beckwithii | ASBEB | Fabaceae | |
| Beckwith's milkvetch | Astragalus beckwithii Torr. & Gray var. purpureus M.E. Jones | ASBEP | Fabaceae | |
| Beckwith's milkvetch | Astragalus beckwithii Torr. & Gray var. sulcatus Barneby | ASBES | Fabaceae | |
| Beckwith's rockcress | Arabis beckwithii S. Wats. | ARBE2 | Brassicaceae | |
| Bedford Springs hawthorn | Crataegus ignave Beadle | CRIG2 | Rosaceae | |
| bedstraw | Cruciata P. Mill. | CRUCI2 | Rubiaceae | |
| bee wattle | Acacia sphaerocephala Schlecht. & Cham. | ACSP4 | Fabaceae | |
| beebrush | Aloysia Juss. | ALOYS | Verbenaceae | |
| Beechey's bamboo | Bambusa beecheyana Munro | BABE2 | Poaceae | |
| beechleaf croton | Croton betulinus Vahl | CRBE4 | Euphorbiaceae | |
| beegum onion | Allium hoffmanii Ownbey | ALHO | Liliaceae | |
| beehive cactus | Coryphantha (Engelm.) Lem. | CORYP | Cactaceae | |
| beet | Beta adanensis A. Pamukc. ex Aellen | BEAD | Chenopodiaceae | |
| beet | Beta atriplicifolia Rouy | BEAT | Chenopodiaceae | |
| beet | Beta L. | BETA | Chenopodiaceae | |
| beet | Beta lomatogona Fischer & C. Meyer | BELO | Chenopodiaceae | |
| beet | Beta nana Boiss. & Heldr. | BENA2 | Chenopodiaceae | |
| beet | Beta patellaris Moq. | BEPA2 | Chenopodiaceae | |
| beet | Beta patula Aiton | BEPA3 | Chenopodiaceae | |
| beet | Beta trigyna Waldst. & Kit. | BETR4 | Chenopodiaceae | |
| beet | Beta vulgaris L. ssp. macrocarpa (Guss.) Thell. | BEVUM2 | Chenopodiaceae | |
| befaria | Bejaria Mutis ex L. f. | BEJAR | Ericaceae | |
| beggarticks | Bidens L. | BIDEN | Asteraceae | |
| begonia | Begonia L. | BEGON | Begoniaceae | |
| beilschmiedia | Beilschmiedia Nees | BEILS | Lauraceae | |
| bejuco de santiago | Aristolochia trilobata L. | ARTR5 | Aristolochiaceae | |
| belah | Casuarina lepidophloia F. Muell. | CALE28 | Casuarinaceae | |
| belamcanda | Belamcanda Adans. | BELAM | Iridaceae | |
| belladonna | Atropa bella-donna L. | ATBE | Solanaceae | |
| belladonna | Atropa L. | ATROP | Solanaceae | |
| belladonna lily | Amaryllis belladonna L. | AMBE3 | Liliaceae | |
| bellemerea lichen | Bellemerea cinereorufescens (Ach.) Clauzade & Roux | BECI3 | Porpidiaceae | |
| bellemerea lichen | Bellemerea diamarta (Ach.) Hafellner & Roux | BEDI3 | Porpidiaceae | |
| bellemerea lichen | Bellemerea Hafellner & Roux | BELLE | Porpidiaceae | |
| bellemerea lichen | Bellemerea sanguinea (Krempelh.) Hafellner & Roux | BESA5 | Porpidiaceae | |
| bellemerea lichen | Bellemerea subsorediza (Lynge) R. Sant. | BESU2 | Porpidiaceae | |
| bellflower | Campanula L. | CAMPA | Campanulaceae | |
| bellflower | Campanulastrum Small | CAMPA2 | Campanulaceae | |
| bellflower | Codonopsis pilosula (Franch.) Nannf. | COPI8 | Campanulaceae | |
| bellis | Bellis L. | BELLI | Asteraceae | |
| bellisima grande | Antigonon guatemalense Meisn. | ANGU | Polygonaceae | |
| belonia lichen | Belonia Korber ex Nyl. | BELON | Gyalectaceae | |
| belonia lichen | Belonia russula Korber ex Nyl. | BERU2 | Gyalectaceae | |
| bengal coffee | Coffea benghalensis Heyne ex Schultes | COBE6 | Rubiaceae | |
| Bengal kino | Butea monosperma (Lam.) Taubert | BUMO5 | Fabaceae | |
| benincasa | Benincasa Savi | BENIN | Cucurbitaceae | |
| benitoa | Benitoa Keck | BENIT | Asteraceae | |
| benitoa | Benitoa occidentalis (Hall) Keck | BEOC | Asteraceae | |
| bensoniella | Bensoniella Morton | BENSO | Saxifragaceae | |
| bent milkvetch | Astragalus inflexus Dougl. ex Hook. | ASIN5 | Fabaceae | |
| bent sedge | Carex styloflexa Buckl. | CAST9 | Cyperaceae | |
| bentawn flatsedge | Cyperus reflexus Vahl | CYRE2 | Cyperaceae | |
| bentflower fiddleneck | Amsinckia lunaris J.F. Macbr. | AMLU | Boraginaceae | |
| bentflower milkvetch | Astragalus vexilliflexus Sheldon | ASVE5 | Fabaceae | |
| bentflower milkvetch | Astragalus vexilliflexus Sheldon var. vexilliflexus | ASVEV2 | Fabaceae | |
| bentgrass | Agrostis castellana Boiss. & Reuter | AGCA11 | Poaceae | |
| bentgrass | Agrostis L. | AGROS2 | Poaceae | |
| Bentham cypress | Cupressus lusitanica Mill. var. benthamii (Endl.) Carriere | CULUB2 | Cupressaceae | |
| Bentham's cornel | Cornus capitata Wall. ex Roxb. | COCA45 | Cornaceae | |
| Bentley's coralroot | Corallorhiza bentleyi Freudenstein | COBE7 | Orchidaceae | |
| bentspur orchid | Campylocentrum Benth. | CAMPY2 | Orchidaceae | |
| bergamot orange | Citrus ×aurantium L. ssp. bergamia (Risso & Poit.) Wight & Arn. ex Engler | CIAUB | Rutaceae | |
| bergia | Bergia L. | BERGI | Elatinaceae | |
| Bering chickweed | Cerastium beeringianum Cham. & Schlecht. | CEBE2 | Caryophyllaceae | |
| Bering chickweed | Cerastium beeringianum Cham. & Schlecht. ssp. beeringianum | CEBEB2 | Caryophyllaceae | |
| Bering chickweed | Cerastium beeringianum Cham. & Schlecht. ssp. beeringianum var. beeringianum | CEBEB4 | Caryophyllaceae | |
| Bering chickweed | Cerastium beeringianum Cham. & Schlecht. ssp. beeringianum var. grandiflorum (Fenzl) Hultén | CEBEG3 | Caryophyllaceae | |
| Bering chickweed | Cerastium beeringianum Cham. & Schlecht. ssp. earlei (Rydb.) Hultén | CEBEE | Caryophyllaceae | |
| Bering reindeer lichen | Cladina arbuscula (Wallr.) Hale & Culb. ssp. beringiana (Ahti) N. S. Golubk. | CLARB | Cladoniaceae | |
| Bering Sea sedge | Carex microchaeta Holm ssp. nesophila (Holm) E. Murr. | CAMIN | Cyperaceae | |
| berkheya | Berkheya Ehrh. | BERKH | Asteraceae | |
| Berks County hawthorn | Crataegus bona Sarg. | CRBO3 | Rosaceae | |
| Berlandier's fiddlewood | Citharexylum berlandieri B.L. Robins. | CIBE | Verbenaceae | |
| Berlandier's Indian mallow | Abutilon berlandieri Gray ex S. Wats. | ABBE | Malvaceae | |
| Berlandier's sundrops | Calylophus berlandieri Spach | CABE6 | Onagraceae | |
| Berlandier's sundrops | Calylophus berlandieri Spach ssp. berlandieri | CABEB2 | Onagraceae | |
| Berlandier's sundrops | Calylophus berlandieri Spach ssp. pinifolius (Engelm. ex Gray) Towner | CABEP2 | Onagraceae | |
| Berlandier's trumpets | Acleisanthes obtusa (Choisy) Standl. | ACOB2 | Nyctaginaceae | |
| Bermudagrass | Cynodon dactylon (L.) Pers. | CYDA | Poaceae | |
| Bermudagrass | Cynodon L.C. Rich. | CYNOD | Poaceae | |
| Berteron's rattlebox | Crotalaria berteriana DC. | CRBE8 | Fabaceae | |
| Berteron's sandmat | Chamaesyce berteriana (Balbis ex Spreng.) Millsp. | CHBE6 | Euphorbiaceae | |
| bertholletia | Bertholletia Humb. & Bonpl. | BERTH | Lecythidaceae | |
| bestia moss | Bestia Broth. | BESTI | Brachytheciaceae | |
| bestia moss | Bestia longipes (Sull. & Lesq.) Broth. | BELO2 | Brachytheciaceae | |
| betel palm | Areca catechu L. | ARCA41 | Arecaceae | |
| betonyleaf brickellbush | Brickellia betonicifolia Gray | BRBE | Asteraceae | |
| betonyleaf thoroughwort | Conoclinium betonicifolium (P. Mill.) King & H.E. Robins. | COBE4 | Asteraceae | |
| Beyrich threeawn | Aristida beyrichiana Trin. & Rupr. | ARBE7 | Poaceae | |
| biatora lichen | Biatora botryosa Fr. | BIBO | Bacidiaceae | |
| biatora lichen | Biatora Fr. | BIATO2 | Bacidiaceae | |
| biatora lichen | Biatora helvola (Korber) Hellbom | BIHE5 | Bacidiaceae | |
| biatorella lichen | Biatorella cyphalea (Tuck.) Zahlbr. | BICY2 | Biatorellaceae | |
| biatorella lichen | Biatorella De Not. | BIATO3 | Biatorellaceae | |
| biatorella lichen | Biatorella hemisphaerica Anzi | BIHE6 | Biatorellaceae | |
| biatorella lichen | Biatorella plicata H. Magn. | BIPL | Biatorellaceae | |
| Bicknell's milkvetch | Astragalus consobrinus (Barneby) Welsh | ASCO16 | Fabaceae | |
| Bicknell's sedge | Carex bicknellii Britt. | CABI3 | Cyperaceae | |
| Bicknell's sedge | Carex opaca (F.J. Herm.) P. Rothr. & Reznicek | CAOP5 | Cyperaceae | |
| bicolored spleenwort | Asplenium heterochroum Kunze | ASHE3 | Aspleniaceae | |
| biddy-biddy | Acaena novae-zelandiae Kirk | ACNO7 | Rosaceae | |
| biennial wormwood | Artemisia biennis Willd. | ARBI2 | Asteraceae | |
| biennial wormwood | Artemisia biennis Willd. var. biennis | ARBIB | Asteraceae | |
| biennial wormwood | Artemisia biennis Willd. var. diffusa Dorn | ARBID | Asteraceae | |
| Big Bend ringstem | Anulocaulis eriosolenus (Gray) Standl. | ANER | Nyctaginaceae | |
| big blue birch | Betula ×caerulea Blanch. (pro sp.) var. grandis Blanch. (pro nm.) | BECAG | Betulaceae | |
| big bluestem | Andropogon gerardii Vitman | ANGE | Poaceae | |
| big carpetgrass | Axonopus furcatus (Flueggé) A.S. Hitchc. | AXFU | Poaceae | |
| big chickweed | Cerastium fontanum Baumg. ssp. vulgare (Hartman) Greuter & Burdet | CEFOV2 | Caryophyllaceae | |
| big devils beggartick | Bidens vulgata Greene | BIVU | Asteraceae | |
| big quakinggrass | Briza maxima L. | BRMA | Poaceae | |
| big sagebrush | Artemisia tridentata Nutt. | ARTR2 | Asteraceae | |
| big sagebrush | Artemisia tridentata Nutt. ssp. parishii (Gray) Hall & Clements | ARTRP2 | Asteraceae | |
| big sagebrush | Artemisia tridentata Nutt. ssp. spiciformis (Osterhout) Kartesz & Gandhi | ARTRS2 | Asteraceae | |
| big sagebrush | Artemisia tridentata Nutt. ssp. xericensis Winward ex R. Rosentreter & R. Kelsey | ARTRX | Asteraceae | |
| big saltbush | Atriplex lentiformis (Torr.) S. Wats. |