| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| APIUM | Apium L. | celery | Apiaceae
|
| APHY | Aplectrum hyemale (Muhl. ex Willd.) Torr. | Adam and Eve | Orchidaceae
|
| APLEC | Aplectrum Torr. | Adam and Eve | Orchidaceae
|
| APWO70 | Aplodon wormskjoldii (Hornem.) Kindb. | Wormskjold's aplodon moss | Splachnaceae
|
| APLOD2 | Aplodon R. Br. | aplodon moss | Splachnaceae
|
| APMO | Aploleia monandra (Sw.) H.E. Moore | Callisia monandra | Commelinaceae
|
| APSP2 | Aplopappus sphaerocephalus Harvey & Gray ex Gray | Acamptopappus sphaerocephalus var. sphaerocephalus | Asteraceae
|
| APTO | Aplopappus tortifolius Torr. & Gray | Xylorhiza tortifolia var. tortifolia | Asteraceae
|
| APMU2 | Apluda mutica L. | Mauritian grass | Poaceae
|
| APLUD | Apluda L. | Mauritian grass | Poaceae
|
| APAM2 | Apocynum ambigens Greene | Apocynum androsaemifolium | Apocynaceae
|
| APANP | Apocynum androsaemifolium L. ssp. pumilum (Gray) Boivin | Apocynum androsaemifolium | Apocynaceae
|
| APANG2 | Apocynum androsaemifolium L. var. glabrum Macoun | Apocynum androsaemifolium | Apocynaceae
|
| APANG4 | Apocynum androsaemifolium L. var. griseum (Greene) B�g. & Bel. | Apocynum androsaemifolium | Apocynaceae
|
| APANI3 | Apocynum androsaemifolium L. var. incanum A. DC. | Apocynum androsaemifolium | Apocynaceae
|
| APANI2 | Apocynum androsaemifolium L. var. intermedium Woods. | Apocynum androsaemifolium | Apocynaceae
|
| APANP3 | Apocynum androsaemifolium L. var. pumilum Gray | Apocynum androsaemifolium | Apocynaceae
|
| APANT2 | Apocynum androsaemifolium L. var. tomentellum (Greene) Boivin | Apocynum androsaemifolium | Apocynaceae
|
| APANW2 | Apocynum androsaemifolium L. var. woodsonii Boivin | Apocynum androsaemifolium | Apocynaceae
|
| APAN2 | Apocynum androsaemifolium L. | spreading dogbane | Apocynaceae
|
| APCAA | Apocynum cannabinum L. var. angustifolium (Woot.) N. Holmgren | Apocynum cannabinum | Apocynaceae
|
| APCAG | Apocynum cannabinum L. var. glaberrimum A. DC. | Apocynum cannabinum | Apocynaceae
|
| APCAG2 | Apocynum cannabinum L. var. greeneanum (B�g. & Bel.) Woods. | Apocynum cannabinum | Apocynaceae
|
| APCAH | Apocynum cannabinum L. var. hypericifolium Gray | Apocynum cannabinum | Apocynaceae
|
| APCAN | Apocynum cannabinum L. var. nemorale (G.S. Mill.) Fern. | Apocynum cannabinum | Apocynaceae
|
| APCAP2 | Apocynum cannabinum L. var. pubescens (Mitchell ex R. Br.) Woods. | Apocynum cannabinum | Apocynaceae
|
| APCAS | Apocynum cannabinum L. var. suksdorfii (Greene) B�g. & Bel. | Apocynum cannabinum | Apocynaceae
|
| APCA | Apocynum cannabinum L. | Indianhemp | Apocynaceae
|
| APFL | Apocynum �floribundum Greene (pro sp.) | | Apocynaceae
|
| APHY2 | Apocynum hypericifolium Ait. | Apocynum cannabinum | Apocynaceae
|
| APJO | Apocynum jonesii Woods. | Apocynum floribundum | Apocynaceae
|
| APMEF | Apocynum medium Greene var. floribundum (Greene) Woods. | Apocynum floribundum | Apocynaceae
|
| APMEL2 | Apocynum medium Greene var. leuconeuron (Greene) Woods. | Apocynum floribundum | Apocynaceae
|
| APMEL | Apocynum medium Greene var. lividum (Greene) Woods. | Apocynum floribundum | Apocynaceae
|
| APMES | Apocynum medium Greene var. sarniense (Greene) Woods. | Apocynum floribundum | Apocynaceae
|
| APMEV | Apocynum medium Greene var. vestitum (Greene) Woods. | Apocynum floribundum | Apocynaceae
|
| APME | Apocynum medium Greene | Apocynum floribundum | Apocynaceae
|
| APMI2 | Apocynum milleri Britt. | Apocynum floribundum | Apocynaceae
|
| APPU2 | Apocynum pubescens Mitchell ex R. Br. | Apocynum cannabinum | Apocynaceae
|
| APPUR | Apocynum pumilum (Gray) Greene var. rhomboideum (Greene) B�g. & Bel. | Apocynum androsaemifolium | Apocynaceae
|
| APPU | Apocynum pumilum (Gray) Greene | Apocynum androsaemifolium | Apocynaceae
|
| APSC | Apocynum scopulorum Greene ex Rydb. | Apocynum androsaemifolium | Apocynaceae
|
| APSIC | Apocynum sibiricum Jacq. var. cordigerum (Greene) Fern. | Apocynum cannabinum | Apocynaceae
|
| APSIF | Apocynum sibiricum Jacq. var. farwellii (Greene) Fern. | Apocynum cannabinum | Apocynaceae
|
| APSIS | Apocynum sibiricum Jacq. var. salignum (Greene) Fern. | Apocynum cannabinum | Apocynaceae
|
| APSI | Apocynum sibiricum Jacq. | Apocynum cannabinum | Apocynaceae
|
| APSUA2 | Apocynum suksdorfii Greene var. angustifolium (Woot.) Woods. | Apocynum cannabinum | Apocynaceae
|
| APSU | Apocynum suksdorfii Greene | Apocynum cannabinum | Apocynaceae
|
| APOCY | Apocynum L. | dogbane | Apocynaceae
|
| APUN | Apodanthera undulata Gray | melon loco | Cucurbitaceae
|
| APODA | Apodanthera Arn. | apodanthera | Cucurbitaceae
|
| APPU3 | Apometzgeria pubescens (Schrank) Kuwah. | | Metzgeriaceae
|
| APOME | Apometzgeria Kuwah. | | Metzgeriaceae
|
| APDI | Aponogeton distachyos L. f. | cape pondweed | Aponogetonaceae
|
| APONO | Aponogeton L. f. | aponogeton | Aponogetonaceae
|
| APNA | Apotreubia nana (S. Hatt. & Inoue) S. Hatt. & Mizut. | | Treubiaceae
|
| APOTR | Apotreubia S. Hatt. & Mizut. | | Treubiaceae
|
| APCO | Aptenia cordifolia (L. f.) Schwant. | heartleaf iceplant | Aizoaceae
|
| APTEN | Aptenia N.E. Br. | aptenia | Aizoaceae
|
| APAPH | Apteria aphylla (Nutt.) Barnh. ex Small var. hymenanthera (Miq.) Jonker | Apteria aphylla | Burmanniaceae
|
| APAP | Apteria aphylla (Nutt.) Barnh. ex Small | nodding nixie | Burmanniaceae
|
| APHY3 | Apteria hymenanthera Miq. | Apteria aphylla | Burmanniaceae
|
| APTER | Apteria Nutt. | apteria | Burmanniaceae
|
| AQAU2 | Aquilegia australis Small | Aquilegia canadensis | Ranunculaceae
|
| AQBA | Aquilegia barnebyi Munz | oil shale columbine | Ranunculaceae
|
| AQBR | Aquilegia brevistyla Hook. | smallflower columbine | Ranunculaceae
|
| AQCAA2 | Aquilegia caerulea James var. alpina A. Nels. | Colorado alpine columbine | Ranunculaceae
|
| AQCAC2 | Aquilegia caerulea James var. caerulea | Colorado blue columbine | Ranunculaceae
|
| AQCAD | Aquilegia caerulea James var. daileyae Eastw. | Dailey's columbine | Ranunculaceae
|
| AQCAO | Aquilegia caerulea James var. ochroleuca Hook. | white Colorado columbine | Ranunculaceae
|
| AQCAP | Aquilegia caerulea James var. pinetorum (Tidestrom) Payson ex Kearney & Peebles | Colorado blue columbine | Ranunculaceae
|
| AQCA2 | Aquilegia caerulea James | Colorado blue columbine | Ranunculaceae
|
| AQCAA | Aquilegia canadensis L. var. australis (Small) Munz | Aquilegia canadensis | Ranunculaceae
|
| AQCAC | Aquilegia canadensis L. var. coccinea (Small) Munz | Aquilegia canadensis | Ranunculaceae
|
| AQCAE | Aquilegia canadensis L. var. eminens (Greene) Boivin | Aquilegia canadensis | Ranunculaceae
|
| AQCAH | Aquilegia canadensis L. var. hybrida Hook. | Aquilegia canadensis | Ranunculaceae
|
| AQCAL | Aquilegia canadensis L. var. latiuscula (Greene) Munz | Aquilegia canadensis | Ranunculaceae
|
| AQCA | Aquilegia canadensis L. | red columbine | Ranunculaceae
|
| AQCH2 | Aquilegia chaplinei Standl. ex Payson | Aquilegia chrysantha var. chaplinei | Ranunculaceae
|
| AQCHC | Aquilegia chrysantha Gray var. chaplinei (Standl. ex Payson) Lott | Chaplin's golden columbine | Ranunculaceae
|
| AQCHC2 | Aquilegia chrysantha Gray var. chrysantha | golden columbine | Ranunculaceae
|
| AQCHH | Aquilegia chrysantha Gray var. hinckleyana (Munz) Lott | Hinckley's golden columbine | Ranunculaceae
|
| AQCHR | Aquilegia chrysantha Gray var. rydbergii Munz | Rydberg's golden columbine | Ranunculaceae
|
| AQCH | Aquilegia chrysantha Gray | golden columbine | Ranunculaceae
|
| AQCO3 | Aquilegia coccinea Small | Aquilegia canadensis | Ranunculaceae
|
| AQCOA | Aquilegia coerulea James var. alpina A. Nels. [orthographic variant] | Aquilegia caerulea var. alpina | Ranunculaceae
|
| AQCOC | Aquilegia coerulea James var. coerulea James [orthographic variant] | Aquilegia caerulea var. caerulea | Ranunculaceae
|
| AQCOD | Aquilegia coerulea James var. daileyae Eastw. [orthographic variant] | Aquilegia caerulea var. daileyae | Ranunculaceae
|
| AQCOO | Aquilegia coerulea James var. ochroleuca Hook. [orthographic variant] | Aquilegia caerulea var. ochroleuca | Ranunculaceae
|
| AQCOP | Aquilegia coerulea James var. pinetorum (Tidestrom) Payson ex Kearney & Peebles [orthographic variant] | Aquilegia caerulea var. pinetorum | Ranunculaceae
|
| AQCO | Aquilegia coerulea James [orthographic variant] | Aquilegia caerulea | Ranunculaceae
|
| AQDE | Aquilegia desertorum (M.E. Jones) Cockerell ex Heller | desert columbine | Ranunculaceae
|
| AQEL | Aquilegia elegantula Greene | western red columbine | Ranunculaceae
|
| AQEX | Aquilegia eximia Van Houtte ex Planch. | Van Houtte's columbine | Ranunculaceae
|
| AQFL2 | Aquilegia flabellata Siebold & Zucc. | fan columbine | Ranunculaceae
|
| AQFLF | Aquilegia flavescens S. Wats. var. flavescens | yellow columbine | Ranunculaceae
|
| AQFLM | Aquilegia flavescens S. Wats. var. miniata A. Nels. & J.F. Macbr. | yellow columbine | Ranunculaceae
|
| AQFLR | Aquilegia flavescens S. Wats. var. rubicunda (Tidestrom) Welsh | yellow columbine | Ranunculaceae
|
| AQFL | Aquilegia flavescens S. Wats. | yellow columbine | Ranunculaceae
|
| AQFOC | Aquilegia formosa Fisch. ex DC. var. communis Boivin | Aquilegia formosa | Ranunculaceae
|
| AQFOF3 | Aquilegia formosa Fisch. ex DC. var. flavescens (S. Wats.) M.E. Peck | Aquilegia flavescens var. flavescens | Ranunculaceae
|