| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| BOTU2 | Bombyliospora tuberculosa (Fee) De Not. | Megalospora tuberculosa | Megalosporaceae
|
| BOVU | Bombyliospora vulpina (Nyl.) Burg. | Letrouitia vulpina | Letrouitiaceae
|
| BOHI | Bommeria hispida (Mett. ex Kuhn) Underwood | copper fern | Pteridaceae
|
| BOMME | Bommeria Fourn. | bommeria fern | Pteridaceae
|
| BOAB | Bonamia abdita (Myint) R.W. Long | Stylisma abdita | Convolvulaceae
|
| BOAQ | Bonamia aquatica (Walt.) Gray | Stylisma aquatica | Convolvulaceae
|
| BOGR5 | Bonamia grandiflora (Gray) Hallier f. | Florida lady's nightcap | Convolvulaceae
|
| BOHU | Bonamia humistrata (Walt.) Gray | Stylisma humistrata | Convolvulaceae
|
| BOMER | Bonamia menziesii Gray var. rockii Myint | Bonamia menziesii | Convolvulaceae
|
| BOME2 | Bonamia menziesii Gray | Hawai'i lady's nightcap | Convolvulaceae
|
| BOMI2 | Bonamia michauxii (Fern. & Schub.) K.A. Wilson | Stylisma aquatica | Convolvulaceae
|
| BOOV2 | Bonamia ovalifolia (Torr.) Hallier f. | bigpod lady's nightcap | Convolvulaceae
|
| BOPAA | Bonamia patens (Desr.) Shinners var. angustifolia (Nash) Shinners | Stylisma patens ssp. angustifolia | Convolvulaceae
|
| BOPA6 | Bonamia patens (Desr.) Shinners | Stylisma patens ssp. patens | Convolvulaceae
|
| BOPI2 | Bonamia pickeringii (Torr. ex M.A. Curtis) Gray | Stylisma pickeringii var. pickeringii | Convolvulaceae
|
| BORE9 | Bonamia repens (I.M. Johnston) Austin & Staples | creeping lady's nightcap | Convolvulaceae
|
| BOVI5 | Bonamia villosa (Nash) K.A. Wilson | Stylisma villosa | Convolvulaceae
|
| BONAM | Bonamia Thouars | lady's nightcap | Convolvulaceae
|
| BOSE | Bonaveria securidaca (L.) Reichenb. | Coronilla securidaca | Fabaceae
|
| BODA | Bontia daphnoides L. | white alling | Myoporaceae
|
| BONTI | Bontia L. | bontia | Myoporaceae
|
| BOOF | Borago officinalis L. | common borage | Boraginaceae
|
| BORAG | Borago L. | borage | Boraginaceae
|
| BOAE | Borassus aethiopum C. Martius | palmyra palm | Arecaceae
|
| BOFL2 | Borassus flabellifer L. | toddy palm | Arecaceae
|
| BORAS2 | Borassus L. | borassus palm | Arecaceae
|
| BOPI3 | Borbonia pinifolia Marloth | Aspalathus linearis | Fabaceae
|
| BOFU | Borinda fungosa (T.P. Yi) C.M.A. Stapleton | Himalayan foothill borinda | Poaceae
|
| BORIN | Borinda Stapleton | borinda | Poaceae
|
| BOME3 | Boronia megastigma Nees ex Bartling | sweet boronia | Rutaceae
|
| BORON | Boronia Smith | boronia | Rutaceae
|
| BOAL4 | Borreria alata (Aubl.) DC. | Spermacoce alata | Rubiaceae
|
| BOBR2 | Borreria brachysepala Urban | Spermacoce sintenisii | Rubiaceae
|
| BODE4 | Borreria densiflora DC. | Spermacoce densiflora | Rubiaceae
|
| BOLAS | Borreria laevis (Lam.) Griseb. var. sintenisii Urban | Spermacoce sintenisii | Rubiaceae
|
| BOLA4 | Borreria laevis auct. non (Lam.) Griseb. | Spermacoce assurgens | Rubiaceae
|
| BOOC | Borreria ocymoides auct. non (Burm. f.) DC. | Spermacoce prostrata | Rubiaceae
|
| BORE7 | Borreria repens auct. non DC. | Spermacoce exilis | Rubiaceae
|
| BOTE6 | Borreria terminalis Small | Spermacoce terminalis | Rubiaceae
|
| BOVE | Borreria verticillata (L.) G.F.W. Mey. | Spermacoce verticillata | Rubiaceae
|
| BOAR2 | Borrichia arborescens (L.) DC. | tree seaside tansy | Asteraceae
|
| BOCU2 | Borrichia �cubana Britt. & Blake (pro sp.) | | Asteraceae
|
| BOFR | Borrichia frutescens (L.) DC. | bushy seaside tansy | Asteraceae
|
| BORRI | Borrichia Adans. | seaside tansy | Asteraceae
|
| BODI5 | Borya distichophylla Nutt. | Buckleya distichophylla | Santalaceae
|
| BOIC | Borzicactus icosagonus (Kunth) Britton & Rose | Cleistocactus icosagonus | Cactaceae
|
| BORZI | Borzicactus Riccob. | borzicactus | Cactaceae
|
| BOHO | Boschniakia hookeri Walp. | Vancouver groundcone | Orobanchaceae
|
| BORO | Boschniakia rossica (Cham. & Schlecht.) Fedtsch. | northern groundcone | Orobanchaceae
|
| BOST2 | Boschniakia strobilacea Gray | California groundcone | Orobanchaceae
|
| BOSCH | Boschniakia C.A. Mey. ex Bong. | groundcone | Orobanchaceae
|
| BOSE4 | Boscia senegalensis (Pers.) Lam. ex Poiret | Senegal boscia | Capparaceae
|
| BOSCI | Boscia Lam. | boscia | Capparaceae
|
| BOCA7 | Boswellia carteri Birdw. | Boswellia sacra | Burseraceae
|
| BOFR3 | Boswellia frereana Birdw. | elemi frankincense | Burseraceae
|
| BOGL7 | Boswellia glabra Roxb. | Boswellia serrata | Burseraceae
|
| BOPA11 | Boswellia papyrifera (Del. ex Caill.) Hochst. | elephant tree | Burseraceae
|
| BOSA3 | Boswellia sacra Flueckiger | frankincense | Burseraceae
|
| BOSE5 | Boswellia serrata Roxb. ex Colebr. | Indian frankincense | Burseraceae
|
| BOSWE | Boswellia Roxb. ex Colebr. | boswellia | Burseraceae
|
| BOAL3 | Bothriochloa alta (A.S. Hitchc.) Henr. | tall beardgrass | Poaceae
|
| BOBAP2 | Bothriochloa barbinodis (Lag.) Herter var. palmeri (Hack.) de Wet | Bothriochloa barbinodis | Poaceae
|
| BOBAP | Bothriochloa barbinodis (Lag.) Herter var. perforata (Trin. ex Fourn.) Gould | Bothriochloa barbinodis | Poaceae
|
| BOBA3 | Bothriochloa barbinodis (Lag.) Herter | cane bluestem | Poaceae
|
| BOBL | Bothriochloa bladhii (Retz.) S.T. Blake | Caucasian bluestem | Poaceae
|
| BOCA3 | Bothriochloa caucasica (Trin.) C.E. Hubbard | Bothriochloa bladhii | Poaceae
|
| BOED | Bothriochloa edwardsiana (Gould) Parodi | Edwards Plateau beardgrass | Poaceae
|
| BOEX | Bothriochloa exaristata (Nash) Henr. | awnless beardgrass | Poaceae
|
| BOHA | Bothriochloa hassleri (Hack.) Cabrera | Bothriochloa exaristata | Poaceae
|
| BOHY | Bothriochloa hybrida (Gould) Gould | hybrid beardgrass | Poaceae
|
| BOIN6 | Bothriochloa insculpta (A. Rich.) A. Camus | sweetpitted grass | Poaceae
|
| BOIN80 | Bothriochloa intermedia (R. Br.) A. Camus | Bothriochloa bladhii | Poaceae
|
| BOISI | Bothriochloa ischaemum (L.) Keng var. ischaemum | yellow bluestem | Poaceae
|
| BOISS | Bothriochloa ischaemum (L.) Keng var. songarica (Rupr. ex Fisch. & C.A. Mey.) Celarier & Harlan | yellow bluestem | Poaceae
|
| BOIS | Bothriochloa ischaemum (L.) Keng | yellow bluestem | Poaceae
|
| BOLAL2 | Bothriochloa laguroides (DC.) Herter ssp. laguroides | silver beardgrass | Poaceae
|
| BOLAT | Bothriochloa laguroides (DC.) Herter ssp. torreyana (Steud.) Allred & Gould | silver beardgrass | Poaceae
|
| BOLA2 | Bothriochloa laguroides (DC.) Herter | silver beardgrass | Poaceae
|
| BOLO | Bothriochloa longipaniculata (Gould) Allred & Gould | longspike beardgrass | Poaceae
|
| BOPA4 | Bothriochloa palmeri (Hack.) Gould | Bothriochloa barbinodis | Poaceae
|
| BOPE2 | Bothriochloa pertusa (L.) A. Camus | pitted beardgrass | Poaceae
|
| BOSAL | Bothriochloa saccharoides (Sw.) Rydb. var. longipaniculata (Gould) Gould | Bothriochloa longipaniculata | Poaceae
|
| BOSAT | Bothriochloa saccharoides (Sw.) Rydb. var. torreyana (Steud.) Gould | Bothriochloa laguroides ssp. torreyana | Poaceae
|
| BOSA | Bothriochloa saccharoides (Sw.) Rydb. | silver bluestem | Poaceae
|
| BOSP3 | Bothriochloa springfieldii (Gould) Parodi | Springfield's beardgrass | Poaceae
|
| BOWR2 | Bothriochloa wrightii (Hack.) Henr. | Wright's beardgrass | Poaceae
|
| BOTHR | Bothriochloa Kuntze | beardgrass | Poaceae
|
| BOTE4 | Bothriospermum tenellum (Hornem.) Fisch. & C.A. Mey. | leaf between flower | Boraginaceae
|
| BOTHR2 | Bothriospermum Bunge | bothriospermum | Boraginaceae
|
| BOAC2 | Botrychium acuminatum W.H. Wagner | tailed grapefern | Ophioglossaceae
|
| BOAL | Botrychium alabamense Maxon | Botrychium jenmanii | Ophioglossaceae
|
| BOAN3 | Botrychium angustisegmentum (Pease & Moore) Fern. | Botrychium lanceolatum var. angustisegmentum | Ophioglossaceae
|
| BOAS2 | Botrychium ascendens W.H. Wagner | trianglelobe moonwort | Ophioglossaceae
|
| BOBI | Botrychium biternatum (Sav.) Underwood | sparselobe grapefern | Ophioglossaceae
|
| BOBOO3 | Botrychium boreale (Fries) Milde ssp. obtusilobum auct. non (Rupr.) Clausen | Botrychium pinnatum | Ophioglossaceae
|
| BOBOO2 | Botrychium boreale (Fries) Milde var. obtusilobum auct. non (Rupr.) Broun | Botrychium pinnatum | Ophioglossaceae
|
| BOCA6 | Botrychium californicum Underwood | Botrychium multifidum | Ophioglossaceae
|
| BOCA5 | Botrychium campestre W.H. Wagner & Farrar | Iowa moonwort | Ophioglossaceae
|
| BOCO3 | Botrychium coulteri Underwood | Botrychium multifidum | Ophioglossaceae
|
| BOCR | Botrychium crenulatum W.H. Wagner | scalloped moonwort | Ophioglossaceae
|
| BODIO | Botrychium dissectum Spreng. var. obliquum (Muhl. ex Willd.) Clute | Botrychium dissectum | Ophioglossaceae
|