| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| BAZZA | Bazzania Gray nom. cons. | | Lepidoziaceae
|
| BECR | Beadlea cranichoides (Griseb.) Small | Cyclopogon cranichoides | Orchidaceae
|
| BEEL | Beadlea elata (Sw.) Small | Cyclopogon elatus | Orchidaceae
|
| BEJUA | Bebbia juncea (Benth.) Greene var. aspera Greene | sweetbush | Asteraceae
|
| BEJU | Bebbia juncea (Benth.) Greene | sweetbush | Asteraceae
|
| BEBBI | Bebbia Greene | sweetbush | Asteraceae
|
| BEERB | Beckmannia eruciformis (L.) Host ssp. baicalensis (Kusnez.) Hult�n | Beckmannia syzigachne | Poaceae
|
| BEERU | Beckmannia eruciformis (L.) Host var. uniflora Scribn. ex Gray | Beckmannia syzigachne | Poaceae
|
| BEER2 | Beckmannia eruciformis auct. non (L.) Host | Beckmannia syzigachne | Poaceae
|
| BESYB | Beckmannia syzigachne (Steud.) Fern. ssp. baicalensis (Kusnez.) Koyama & Kawano | Beckmannia syzigachne | Poaceae
|
| BESYU | Beckmannia syzigachne (Steud.) Fern. var. uniflora (Scribn. ex Gray) Boivin | Beckmannia syzigachne | Poaceae
|
| BESY | Beckmannia syzigachne (Steud.) Fern. | American sloughgrass | Poaceae
|
| BECKM | Beckmannia Host | sloughgrass | Poaceae
|
| BEAN2 | Beckwithia andersonii (Gray) Jepson | Ranunculus andersonii var. andersonii | Ranunculaceae
|
| BEGLC | Beckwithia glacialis (L.) A.& D. L�ve ssp. chamissonis (Schlecht.) A.& D. L�ve | Ranunculus glacialis var. chamissonis | Ranunculaceae
|
| BERA2 | Befaria racemosa Vent. | tarflower | Ericaceae
|
| BEFAR | Befaria Mutis ex L. f. | befaria | Ericaceae
|
| BECO | Begonia coccinea Hook. | scarlet begonia | Begoniaceae
|
| BECO2 | Begonia convolvulacea A. DC. | morning-glory begonia | Begoniaceae
|
| BECUH | Begonia cucullata Willd. var. hookeri (A. DC.) L.B. Sm. & Schub. | Begonia cucullata | Begoniaceae
|
| BECU | Begonia cucullata Willd. | clubed begonia | Begoniaceae
|
| BEDE2 | Begonia decandra Pav�n ex A. DC. | native begonia | Begoniaceae
|
| BEFOM | Begonia foliosa Kunth var. miniata (Planch.) L.B. Sm. & Schub. | fuchsia begonia | Begoniaceae
|
| BEFO | Begonia foliosa Kunth | fuchsia begonia | Begoniaceae
|
| BEHE2 | Begonia heracleifolia Cham. & Schlecht. | starleaf begonia | Begoniaceae
|
| BEHI2 | Begonia hirtella Link | Brazilian begonia | Begoniaceae
|
| BENE3 | Begonia nelumbiifolia Cham. & Schlecht. | lilypad begonia | Begoniaceae
|
| BERE2 | Begonia reniformis Dry. | grapeleaf begonia | Begoniaceae
|
| BESE | Begonia semperflorens Link & Otto | Begonia cucullata | Begoniaceae
|
| BEGON | Begonia L. | begonia | Begoniaceae
|
| BEPE | Beilschmiedia pendula (Sw.) Hemsl. | slugwood | Lauraceae
|
| BEILS | Beilschmiedia Nees | beilschmiedia | Lauraceae
|
| BECH | Belamcanda chinensis (L.) DC. | blackberry lily | Iridaceae
|
| BELAM | Belamcanda Adans. | belamcanda | Iridaceae
|
| BETR | Bellardia trixago (L.) All. | Mediterranean lineseed | Scrophulariaceae
|
| BELLA | Bellardia All. | lineseed | Scrophulariaceae
|
| BEAL6 | Bellemerea alpina (Sommerf.) Clauzade & Roux | | Porpidiaceae
|
| BECI3 | Bellemerea cinereorufescens (Ach.) Clauzade & Roux | | Porpidiaceae
|
| BEDI3 | Bellemerea diamarta (Ach.) Hafellner & Roux | | Porpidiaceae
|
| BESA5 | Bellemerea sanguinea (Krempelh.) Hafellner & Roux | | Porpidiaceae
|
| BESU2 | Bellemerea subsorediza (Lynge) R. Sant. | | Porpidiaceae
|
| BELLE | Bellemerea Hafellner & Roux | bellemerea | Porpidiaceae
|
| BEIN4 | Bellis integrifolia Michx. | Astranthium integrifolium ssp. integrifolium | Asteraceae
|
| BEPE2 | Bellis perennis L. | lawndaisy | Asteraceae
|
| BELLI | Bellis L. | bellis | Asteraceae
|
| BECO5 | Beloglottis costaricensis (Reichenb. f.) Schlechter | Spiranthes costaricensis | Orchidaceae
|
| BEFE2 | Belonia fennica Vainio | Belonia russula | Gyalectaceae
|
| BERU2 | Belonia russula Korber ex Nyl. | | Gyalectaceae
|
| BELON | Belonia Korber ex Nyl. | belonia | Gyalectaceae
|
| BECA7 | Beloperone californica Benth. | Justicia californica | Acanthaceae
|
| BEGU | Beloperone guttata Brandeg. | Justicia brandegeeana | Acanthaceae
|
| BECE | Benincasa cerifera Savi | Benincasa hispida | Cucurbitaceae
|
| BEHI3 | Benincasa hispida (Thunb.) Cogn. | waxgourd | Cucurbitaceae
|
| BENIN | Benincasa Savi | benincasa | Cucurbitaceae
|
| BEOC | Benitoa occidentalis (Hall) Keck | benitoa | Asteraceae
|
| BENIT | Benitoa Keck | benitoa | Asteraceae
|
| BEOR2 | Bensonia oregona Abrams & Bacig. | Bensoniella oregana | Saxifragaceae
|
| BEOR | Bensoniella oregana (Abrams & Bacig.) Morton | Oregon bensoniella | Saxifragaceae
|
| BENSO | Bensoniella Morton | bensoniella | Saxifragaceae
|
| BECA6 | Benthamantha caribaea (Jacq.) Kunth | Coursetia caribaea var. caribaea | Fabaceae
|
| BEEDG | Benthamantha edwardsii (Gray) Rose var. glabella (Gray) Wiggins | Coursetia glabella | Fabaceae
|
| BEGL3 | Benthamantha glabella (Gray) Rydb. | Coursetia glabella | Fabaceae
|
| BELY2 | Benthamia lycopsoides (Lehm.) Lindl. ex Druce | Amsinckia lycopsoides | Boraginaceae
|
| BEAEP | Benzoin aestivale (L.) Nees var. pubescens Palmer & Steyermark | Lindera benzoin var. pubescens | Lauraceae
|
| BEAE | Benzoin aestivale (L.) Nees | Lindera benzoin var. benzoin | Lauraceae
|
| BEME | Benzoin melissifolium (Walt.) Nees | Lindera melissifolia | Lauraceae
|
| BEAM | Berberis amplectens (Eastw.) L.C. Wheeler | Mahonia repens | Berberidaceae
|
| BEAQD | Berberis aquifolium Pursh var. dictyota (Jepson) Jepson | Mahonia dictyota | Berberidaceae
|
| BEAQR | Berberis aquifolium Pursh var. repens (Lindl.) Scoggan | Mahonia repens | Berberidaceae
|
| BEAQ | Berberis aquifolium Pursh | Mahonia aquifolium | Berberidaceae
|
| BEBE2 | Berberis bealei Fortune | Mahonia bealei | Berberidaceae
|
| BECA5 | Berberis californica Jepson | Mahonia dictyota | Berberidaceae
|
| BECA2 | Berberis canadensis P. Mill. | American barberry | Berberidaceae
|
| BEDA | Berberis darwinii Hook. | Darwin's berberis | Berberidaceae
|
| BEDI | Berberis dictyota Jepson | Mahonia dictyota | Berberidaceae
|
| BEFE | Berberis fendleri Gray | Colorado barberry | Berberidaceae
|
| BEFR | Berberis fremontii Torr. | Mahonia fremontii | Berberidaceae
|
| BEHA | Berberis haematocarpa Woot. | Mahonia haematocarpa | Berberidaceae
|
| BEHA2 | Berberis harrisoniana Kearney & Peebles | Harrison's barberry | Berberidaceae
|
| BEHI | Berberis higginsiae Munz | Mahonia fremontii | Berberidaceae
|
| BEJU3 | Berberis julianiae Schneid. | Julian's berberis | Berberidaceae
|
| BENEM | Berberis nervosa Pursh var. mendocinensis J.B. Roof | Mahonia nervosa | Berberidaceae
|
| BENE2 | Berberis nervosa Pursh | Mahonia nervosa | Berberidaceae
|
| BENE | Berberis nevinii Gray | Mahonia nevinii | Berberidaceae
|
| BEOT | Berberis �ottawensis Schneid. | | Berberidaceae
|
| BEPII | Berberis pinnata Lag. ssp. insularis Munz | Mahonia pinnata ssp. insularis | Berberidaceae
|
| BEPI | Berberis pinnata Lag. | Mahonia pinnata ssp. pinnata | Berberidaceae
|
| BEPI2 | Berberis piperiana (Abrams) McMinn | Mahonia aquifolium | Berberidaceae
|
| BEPU | Berberis pumila Greene | Mahonia repens | Berberidaceae
|
| BERE | Berberis repens Lindl. | Mahonia repens | Berberidaceae
|
| BESO | Berberis sonnei (Abrams) McMinn | Mahonia repens | Berberidaceae
|
| BESW | Berberis swaseyi Buckl. ex Young | Mahonia swaseyi | Berberidaceae
|
| BETHA | Berberis thunbergii DC. var. atropurpurea Chenault | Berberis thunbergii | Berberidaceae
|
| BETH | Berberis thunbergii DC. | Japanese barberry | Berberidaceae
|
| BETRG2 | Berberis trifoliolata Moric. var. glauca (I.M. Johnston) M.C. Johnston ex Laferri�re | Mahonia trifoliolata | Berberidaceae
|
| BETR5 | Berberis trifoliolata Moric. | Mahonia trifoliolata | Berberidaceae
|
| BEVU | Berberis vulgaris L. | common barberry | Berberidaceae
|
| BEWI | Berberis wilcoxii Kearney | Wilcox's barberry | Berberidaceae
|
| BEWI3 | Berberis wisleyensis Ahrendt | Wisley barberry | Berberidaceae
|
| BERBE | Berberis L. | barberry | Berberidaceae
|
| BESC | Berchemia scandens (Hill) K. Koch | Alabama supplejack | Rhamnaceae
|