| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| BOBAR | Bouteloua barbata Lag. var. rothrockii (Vasey) Gould | Bouteloua rothrockii | Poaceae
|
| BOBA2 | Bouteloua barbata Lag. | sixweeks grama | Poaceae
|
| BOBR | Bouteloua breviseta Vasey | gypsum grama | Poaceae
|
| BOCH | Bouteloua chondrosioides (Kunth) Benth. ex S. Wats. | sprucetop grama | Poaceae
|
| BOCUC | Bouteloua curtipendula (Michx.) Torr. var. caespitosa Gould & Kapadia | sideoats grama | Poaceae
|
| BOCUC2 | Bouteloua curtipendula (Michx.) Torr. var. curtipendula | sideoats grama | Poaceae
|
| BOCU | Bouteloua curtipendula (Michx.) Torr. | sideoats grama | Poaceae
|
| BOEL | Bouteloua eludens Griffiths | Santa Rita Mountain grama | Poaceae
|
| BOER4 | Bouteloua eriopoda (Torr.) Torr. | black grama | Poaceae
|
| BOFI2 | Bouteloua filiformis (Fourn.) Griffiths | Bouteloua repens | Poaceae
|
| BOGL5 | Bouteloua glandulosa (Cerv.) Swallen | Bouteloua hirsuta var. hirsuta | Poaceae
|
| BOGRS | Bouteloua gracilis (Willd. ex Kunth) Lag. ex Griffiths var. stricta (Vasey) A.S. Hitchc. | Bouteloua gracilis | Poaceae
|
| BOGR2 | Bouteloua gracilis (Willd. ex Kunth) Lag. ex Griffiths | blue grama | Poaceae
|
| BOHE4 | Bouteloua heterostega (Trin.) Griffiths | Bouteloua repens | Poaceae
|
| BOHIP2 | Bouteloua hirsuta Lag. ssp. pectinata (Featherly) J. Wipff & S.D. Jones | Bouteloua hirsuta var. pectinata | Poaceae
|
| BOHIG | Bouteloua hirsuta Lag. var. glandulosa (Cerv.) Gould | Bouteloua hirsuta var. hirsuta | Poaceae
|
| BOHIH | Bouteloua hirsuta Lag. var. hirsuta | hairy grama | Poaceae
|
| BOHIP | Bouteloua hirsuta Lag. var. pectinata (Featherly) Cory | tall grama | Poaceae
|
| BOHI2 | Bouteloua hirsuta Lag. | hairy grama | Poaceae
|
| BOJU | Bouteloua juncea (Desv. ex Beauv.) A.S. Hitchc. | lamilla | Poaceae
|
| BOKA | Bouteloua kayi Warnock | Kay's grama | Poaceae
|
| BOOL | Bouteloua oligostachya (Nutt.) Torr. ex Gray | Bouteloua gracilis | Poaceae
|
| BOPA2 | Bouteloua parryi (Fourn.) Griffiths | Parry's grama | Poaceae
|
| BOPE3 | Bouteloua pectinata Featherly | Bouteloua hirsuta var. pectinata | Poaceae
|
| BORA | Bouteloua radicosa (Fourn.) Griffiths | purple grama | Poaceae
|
| BORA4 | Bouteloua ramosa Scribn. ex Vasey | Chino grama | Poaceae
|
| BORE2 | Bouteloua repens (Kunth) Scribn. & Merr. | slender grama | Poaceae
|
| BORI | Bouteloua rigidiseta (Steud.) A.S. Hitchc. | Texas grama | Poaceae
|
| BORO2 | Bouteloua rothrockii Vasey | Rothrock's grama | Poaceae
|
| BOSI2 | Bouteloua simplex Lag. | matted grama | Poaceae
|
| BOTRB | Bouteloua trifida Thurb. var. burkii (Scribn. ex S. Wats.) Vasey ex L.H. Dewey | red grama | Poaceae
|
| BOTRT | Bouteloua trifida Thurb. var. trifida | red grama | Poaceae
|
| BOTR2 | Bouteloua trifida Thurb. | red grama | Poaceae
|
| BOUN | Bouteloua uniflora Vasey | oneflower grama | Poaceae
|
| BOWA | Bouteloua warnockii Gould & Kapadia | Warnock's grama | Poaceae
|
| BOUTE | Bouteloua Lag. | grama | Poaceae
|
| BOGL3 | Bouvardia glaberrima Engelm. | Bouvardia ternifolia | Rubiaceae
|
| BOTE2 | Bouvardia ternifolia (Cav.) Schlecht. | firecrackerbush | Rubiaceae
|
| BOUVA | Bouvardia Salisb. | bouvardia | Rubiaceae
|
| BOIN3 | Bowlesia incana Ruiz & Pav�n | hoary bowlesia | Apiaceae
|
| BOSE2 | Bowlesia septentrionalis Coult. & Rose | Bowlesia incana | Apiaceae
|
| BOWLE | Bowlesia Ruiz & Pav�n | bowlesia | Apiaceae
|
| BOAC | Boykinia aconitifolia Nutt. | Allegheny brookfoam | Saxifragaceae
|
| BOEL2 | Boykinia elata (Nutt.) Greene | Boykinia occidentalis | Saxifragaceae
|
| BOHE3 | Boykinia heucheriformis (Rydb.) Rosendahl | Telesonix heucheriformis | Saxifragaceae
|
| BOIN4 | Boykinia intermedia (Piper) G.N. Jones | Sierra brookfoam | Saxifragaceae
|
| BOJAH | Boykinia jamesii (Torr.) Engl. var. heucheriformis (Rydb.) Engl. | Telesonix heucheriformis | Saxifragaceae
|
| BOJA | Boykinia jamesii (Torr.) Engl. | Telesonix jamesii | Saxifragaceae
|
| BOMAI | Boykinia major Gray var. intermedia Piper | Boykinia intermedia | Saxifragaceae
|
| BOMA3 | Boykinia major Gray | large boykinia | Saxifragaceae
|
| BOOC2 | Boykinia occidentalis Torr. & Gray | coastal brookfoam | Saxifragaceae
|
| BORA5 | Boykinia ranunculifolia (Hook.) Gray | Suksdorfia ranunculifolia | Saxifragaceae
|
| BORI2 | Boykinia richardsonii (Hook.) Rothrock | Richardson's brookfoam | Saxifragaceae
|
| BORO3 | Boykinia rotundifolia Parry | roundleaf brookfoam | Saxifragaceae
|
| BOTU | Boykinia turbinata (Rydb.) Fedde | Boykinia aconitifolia | Saxifragaceae
|
| BOVA | Boykinia vancouverensis (Rydb.) Fedde | Boykinia occidentalis | Saxifragaceae
|
| BOYKI | Boykinia Nutt. | brookfoam | Saxifragaceae
|
| BRRO7 | Brachelyma robustum (Card.) Britt. | Brachelyma subulatum | Fontinalaceae
|
| BRSU8 | Brachelyma subulatum (P. Beauv.) Schimp. ex Card. | brachelyma moss | Fontinalaceae
|
| BRACH11 | Brachelyma Schimp. ex Card. | brachelyma moss | Fontinalaceae
|
| BRAD | Brachiaria adspersa (Trin.) Parodi | Urochloa adspersa | Poaceae
|
| BRAN2 | Brachiaria annulatum (Forsk.) Stapf | ringed signalgrass | Poaceae
|
| BRAR7 | Brachiaria arizonica (Scribn. & Merr.) S.T. Blake | Urochloa arizonica | Poaceae
|
| BRAR8 | Brachiaria arrecta (Hack. ex T. Dur. & Schinz) Stent | Urochloa arrecta | Poaceae
|
| BRBR | Brachiaria brizantha (C. Hochstetter ex A. Rich.) Stapf | Urochloa brizantha | Poaceae
|
| BRCI | Brachiaria ciliatissima (Buckl.) Chase | Urochloa ciliatissima | Poaceae
|
| BRDE7 | Brachiaria decumbens Stapf | Urochloa brizantha | Poaceae
|
| BRDE8 | Brachiaria deflexa (Schumacher) C. E. Hubb. ex Robyns | deflexed brachiaria | Poaceae
|
| BRDI13 | Brachiaria distichophylla (Trin.) Stapf | Urochloa villosa | Poaceae
|
| BREC | Brachiaria echinulata (Mez) Parodi | Urochloa adspersa | Poaceae
|
| BRER | Brachiaria eruciformis (Sm.) Griseb. | sweet signalgrass | Poaceae
|
| BREX | Brachiaria extensa Chase | Urochloa platyphylla | Poaceae
|
| BRFAR | Brachiaria fasciculata (Sw.) Parodi var. reticulata (Torr.) Beetle | Urochloa fasciculata | Poaceae
|
| BRFA | Brachiaria fasciculata (Sw.) Parodi | Urochloa fasciculata | Poaceae
|
| BRMU | Brachiaria mutica (Forsk.) Stapf | Urochloa mutica | Poaceae
|
| BROL3 | Brachiaria oligobrachiata (Pilger) Henr. | Urochloa oligobrachiata | Poaceae
|
| BRPI7 | Brachiaria piligera (F. Muell. ex Benth.) D.K. Hughes | Urochloa piligera | Poaceae
|
| BRPL | Brachiaria plantaginea (Link) A.S. Hitchc. | Urochloa plantaginea | Poaceae
|
| BRPL2 | Brachiaria platyphylla (Munro ex Wright) Nash | Urochloa platyphylla | Poaceae
|
| BRPL6 | Brachiaria platytaenia Stapf | Urochloa oligobrachiata | Poaceae
|
| BRPU5 | Brachiaria purpurascens (Raddi) Henr. | Urochloa mutica | Poaceae
|
| BRRA80 | Brachiaria ramosa (L.) Stapf | Urochloa ramosa | Poaceae
|
| BRRE | Brachiaria reptans (L.) Gard. & C.E. Hubbard | Urochloa reptans | Poaceae
|
| BRRU80 | Brachiaria ruziziensis Germ. & Evrard | Urochloa brizantha | Poaceae
|
| BRSUP | Brachiaria subquadripara (Trin.) A.S. Hitchc. var. piligera (F. Muell. ex Benth.) Reeder | Urochloa piligera | Poaceae
|
| BRSU | Brachiaria subquadripara (Trin.) A.S. Hitchc. | Urochloa subquadripara | Poaceae
|
| BRTE3 | Brachiaria texana (Buckl.) S.T. Blake | Urochloa texana | Poaceae
|
| BRACH | Brachiaria (Trin.) Griseb. | signalgrass | Poaceae
|
| BRCI4 | Brachionidium ciliolatum Garay | hairy cup orchid | Orchidaceae
|
| BRSH3 | Brachionidium sherringii Rolfe | Sherring's cup orchid | Orchidaceae
|
| BRACH4 | Brachionidium Lindl. | cup orchid | Orchidaceae
|
| BRAN4 | Brachyactis angusta (Lindl.) Britt. | Symphyotrichum ciliatum | Asteraceae
|
| BRCIA | Brachyactis ciliata (Ledeb.) Ledeb. ssp. angusta (Lindl.) A.G. Jones | Symphyotrichum ciliatum | Asteraceae
|
| BRCI6 | Brachyactis ciliata (Ledeb.) Ledeb. | Symphyotrichum ciliatum | Asteraceae
|
| BRFR4 | Brachyactis frondosa (Nutt.) Gray | Symphyotrichum frondosum | Asteraceae
|
| BRSP3 | Brachychaeta sphacelata (Raf.) Britt. | Solidago sphacelata | Asteraceae
|
| BRAC7 | Brachychiton acerifolius (A. Cunn. ex G. Don) Macarthur | flame bottletree | Sterculiaceae
|
| BRPO6 | Brachychiton populneum (Schott) R. Br. | whiteflower kurrajong | Sterculiaceae
|
| BRACH13 | Brachychiton Schott & Endl. | brachychiton | Sterculiaceae
|
| BROL2 | Brachydontium olympicum (Britt. in Frye) McIntosh & Spence | Olympic brachydontium moss | Seligeriaceae
|
| BRTR4 | Brachydontium trichodes (Web.) Milde | brachydontium moss | Seligeriaceae
|