| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| AROV | Arnoglossum ovatum (Walt.) H.E. Robins. | ovateleaf cacalia | Asteraceae
|
| ARPL4 | Arnoglossum plantagineum Raf. | groovestem Indian plaintain | Asteraceae
|
| ARRE6 | Arnoglossum reniforme (Hook.) H.E. Robins. | Arnoglossum muehlenbergii | Asteraceae
|
| ARSU5 | Arnoglossum sulcatum (Fern.) H.E. Robins. | Georgia Indian plaintain | Asteraceae
|
| ARNOG | Arnoglossum Raf. | Indian plaintain | Asteraceae
|
| ARMI3 | Arnoseris minima (L.) Schweig. & Koerte | lamb succory | Asteraceae
|
| ARNOS | Arnoseris Gaertn. | arnoseris | Asteraceae
|
| ARARA3 | Aronia arbutifolia (L.) Pers. var. atropurpurea (Britt.) Seymour | Photinia floribunda | Rosaceae
|
| ARARG | Aronia arbutifolia (L.) Pers. var. glabra Ell. | Photinia pyrifolia | Rosaceae
|
| ARARN3 | Aronia arbutifolia (L.) Pers. var. nigra (Willd.) Seymour | Photinia melanocarpa | Rosaceae
|
| ARAR7 | Aronia arbutifolia (L.) Pers. | Photinia pyrifolia | Rosaceae
|
| ARAT6 | Aronia atropurpurea Britt. | Photinia floribunda | Rosaceae
|
| ARFL3 | Aronia floribunda (Lindl.) Spach | Photinia floribunda | Rosaceae
|
| ARME6 | Aronia melanocarpa (Michx.) Ell. | Photinia melanocarpa | Rosaceae
|
| ARNI3 | Aronia nigra (Willd.) Koehne | Photinia melanocarpa | Rosaceae
|
| ARPR2 | Aronia prunifolia (Marsh.) Rehd. | Photinia floribunda | Rosaceae
|
| ARCH5 | Arrabidaea chica (Humb. & Bonpl.) Verl. | cricketvine | Bignoniaceae
|
| ARRAB | Arrabidaea DC. | arrabidaea | Bignoniaceae
|
| ARES3 | Arracacia esculenta DC. | Arracacia xanthorrhiza | Apiaceae
|
| ARXA2 | Arracacia xanthorrhiza E.N. Bancroft | arracacha | Apiaceae
|
| ARRAC2 | Arracacia E.N. Bancroft | arracacia | Apiaceae
|
| ARELB3 | Arrhenatherum elatius (L.) Beauv. ex J.& K. Presl ssp. bulbosum (Willd.) Sch�bler & G. Martens | Arrhenatherum elatius var. bulbosum | Poaceae
|
| ARELB2 | Arrhenatherum elatius (L.) Beauv. ex J.& K. Presl var. biaristatum (Peterm.) Peterm. | Arrhenatherum elatius var. elatius | Poaceae
|
| ARELB | Arrhenatherum elatius (L.) Beauv. ex J.& K. Presl var. bulbosum (Willd.) Spenner | tall oatgrass | Poaceae
|
| ARELE | Arrhenatherum elatius (L.) Beauv. ex J.& K. Presl var. elatius | tall oatgrass | Poaceae
|
| ARELT | Arrhenatherum elatius (L.) Beauv. ex J.& K. Presl var. tuberosum Thiel. | Arrhenatherum elatius var. bulbosum | Poaceae
|
| AREL3 | Arrhenatherum elatius (L.) Beauv. ex J.& K. Presl | tall oatgrass | Poaceae
|
| ARRHE | Arrhenatherum Beauv. | oatgrass | Poaceae
|
| ARHE9 | Arrhenopterum heterostichum Hedw. | Aulacomnium heterostichum | Aulacomniaceae
|
| ARFR7 | Arsenococcus frondosus (Pursh) Small | Lyonia ligustrina var. foliosiflora | Ericaceae
|
| ARLI9 | Arsenococcus ligustrinus (L.) Small | Lyonia ligustrina var. ligustrina | Ericaceae
|
| ARHE11 | Artabotrys hexapetalus (L. f.) Bhandari | climbing ilang-ilang | Annonaceae
|
| ARTAB | Artabotrys R. Br. | tail grape | Annonaceae
|
| ARAB2 | Artemisia abrotanum L. | southernwood | Asteraceae
|
| ARABI3 | Artemisia absinthium L. var. insipida Stechmann | Artemisia absinthium | Asteraceae
|
| ARAB3 | Artemisia absinthium L. | absinthium | Asteraceae
|
| ARAL5 | Artemisia alaskana Rydb. | Alaska wormwood | Asteraceae
|
| ARAL14 | Artemisia albula Woot. | Artemisia ludoviciana ssp. albula | Asteraceae
|
| ARAL6 | Artemisia aleutica Hult�n | Aleutian wormwood | Asteraceae
|
| ARAN20 | Artemisia angusta Rydb. | Artemisia tridentata ssp. tridentata | Asteraceae
|
| ARAN3 | Artemisia annua L. | sweet sagewort | Asteraceae
|
| ARARA | Artemisia arbuscula Nutt. ssp. arbuscula | little sagebrush | Asteraceae
|
| ARARL3 | Artemisia arbuscula Nutt. ssp. longicaulis Winward & McArthur | little sagebrush | Asteraceae
|
| ARARL | Artemisia arbuscula Nutt. ssp. longiloba (Osterhout) L. Shultz | little sagebrush | Asteraceae
|
| ARARN2 | Artemisia arbuscula Nutt. ssp. nova (A. Nels.) G.H. Ward | Artemisia nova | Asteraceae
|
| ARART | Artemisia arbuscula Nutt. ssp. thermopola Beetle | little sagebrush | Asteraceae
|
| ARARL2 | Artemisia arbuscula Nutt. var. longiloba (Osterhout) Dorn | Artemisia arbuscula ssp. longiloba | Asteraceae
|
| ARARN | Artemisia arbuscula Nutt. var. nova (A. Nels.) Cronq. | Artemisia nova | Asteraceae
|
| ARAR8 | Artemisia arbuscula Nutt. | little sagebrush | Asteraceae
|
| ARARA2 | Artemisia arctica Less. ssp. arctica | boreal sagebrush | Asteraceae
|
| ARARB | Artemisia arctica Less. ssp. beringensis (Hult�n) Hult�n | boreal sagebrush | Asteraceae
|
| ARARC | Artemisia arctica Less. ssp. comata (Rydb.) Hult�n | boreal sagebrush | Asteraceae
|
| ARARS | Artemisia arctica Less. ssp. saxicola (Rydb.) Hult�n | Artemisia arctica ssp. arctica | Asteraceae
|
| ARARB2 | Artemisia arctica Less. var. beringensis Hult�n | Artemisia arctica ssp. beringensis | Asteraceae
|
| ARAR9 | Artemisia arctica Less. | boreal sagebrush | Asteraceae
|
| ARAR10 | Artemisia argilosa Beetle | Artemisia cana ssp. viscidula | Asteraceae
|
| ARAU3 | Artemisia australis Less. | Oahu wormwood | Asteraceae
|
| ARBIB | Artemisia biennis Willd. var. biennis | biennial wormwood | Asteraceae
|
| ARBID | Artemisia biennis Willd. var. diffusa Dorn | biennial wormwood | Asteraceae
|
| ARBI2 | Artemisia biennis Willd. | biennial wormwood | Asteraceae
|
| ARBI3 | Artemisia bigelovii Gray | Bigelow sage | Asteraceae
|
| ARBO5 | Artemisia bolanderi Gray | Artemisia cana ssp. bolanderi | Asteraceae
|
| ARBOP | Artemisia borealis Pallas ssp. purshii (Hook.) Hult�n | Artemisia campestris ssp. borealis var. borealis | Asteraceae
|
| ARBOL | Artemisia borealis Pallas var. latisecta Fern. | Artemisia campestris ssp. borealis var. borealis | Asteraceae
|
| ARBOP2 | Artemisia borealis Pallas var. purshii Hook. | Artemisia campestris ssp. borealis var. borealis | Asteraceae
|
| ARBO4 | Artemisia borealis Pallas | Artemisia campestris ssp. borealis var. borealis | Asteraceae
|
| ARCAI | Artemisia californica Less. var. insularis (Rydb.) Munz | Artemisia nesiotica | Asteraceae
|
| ARCA11 | Artemisia californica Less. | coastal sagebrush | Asteraceae
|
| ARCAB4 | Artemisia campestris L. ssp. borealis (Pallas) Hall & Clements var. borealis (Pallas) M.E. Peck | field sagewort | Asteraceae
|
| ARCAP4 | Artemisia campestris L. ssp. borealis (Pallas) Hall & Clements var. petiolata Welsh | field sagewort | Asteraceae
|
| ARCAS5 | Artemisia campestris L. ssp. borealis (Pallas) Hall & Clements var. scouleriana (Hook.) Cronq. | field sagewort | Asteraceae
|
| ARCAW | Artemisia campestris L. ssp. borealis (Pallas) Hall & Clements var. wormskioldii (Bess. ex Hook.) Cronq. | field sagewort | Asteraceae
|
| ARCAB2 | Artemisia campestris L. ssp. borealis (Pallas) Hall & Clements | field sagewort | Asteraceae
|
| ARCAC9 | Artemisia campestris L. ssp. canadensis (Michx.) Scoggan | Artemisia campestris ssp. borealis var. borealis | Asteraceae
|
| ARCAC | Artemisia campestris L. ssp. caudata (Michx.) Hall & Clements | field sagewort | Asteraceae
|
| ARCAP2 | Artemisia campestris L. ssp. pacifica (Nutt.) Hall & Clements | Artemisia campestris ssp. borealis var. scouleriana | Asteraceae
|
| ARCAC10 | Artemisia campestris L. var. canadensis (Michx.) Welsh | Artemisia campestris ssp. borealis var. borealis | Asteraceae
|
| ARCAC11 | Artemisia campestris L. var. caudata (Michx.) Palmer & Steyermark | Artemisia campestris ssp. caudata | Asteraceae
|
| ARCAD | Artemisia campestris L. var. douglasiana (Bess.) Boivin | Artemisia campestris ssp. borealis var. scouleriana | Asteraceae
|
| ARCAP3 | Artemisia campestris L. var. pacifica (Nutt.) M.E. Peck | Artemisia campestris ssp. borealis var. scouleriana | Asteraceae
|
| ARCAP5 | Artemisia campestris L. var. purshii (Hook.) Cronq. | Artemisia campestris ssp. borealis var. borealis | Asteraceae
|
| ARCAS4 | Artemisia campestris L. var. strutziae Welsh | Artemisia campestris ssp. borealis var. scouleriana | Asteraceae
|
| ARCA12 | Artemisia campestris L. | field sagewort | Asteraceae
|
| ARCA30 | Artemisia camporum Rydb. | Artemisia campestris ssp. borealis var. scouleriana | Asteraceae
|
| ARCAB3 | Artemisia cana Pursh ssp. bolanderi (Gray) G.H. Ward | silver sagebrush | Asteraceae
|
| ARCAC5 | Artemisia cana Pursh ssp. cana | silver sagebrush | Asteraceae
|
| ARCAV2 | Artemisia cana Pursh ssp. viscidula (Osterhout) Beetle | silver sagebrush | Asteraceae
|
| ARCAV | Artemisia cana Pursh var. viscidula Osterhout | Artemisia cana ssp. viscidula | Asteraceae
|
| ARCA13 | Artemisia cana Pursh | silver sagebrush | Asteraceae
|
| ARCA23 | Artemisia canadensis Michx. | Artemisia campestris ssp. borealis var. borealis | Asteraceae
|
| ARCA28 | Artemisia candicans Rydb. | Artemisia ludoviciana ssp. candicans | Asteraceae
|
| ARCAW2 | Artemisia carruthii Wood ex Carruth. var. wrightii (Gray) Blake | Artemisia carruthii | Asteraceae
|
| ARCA14 | Artemisia carruthii Wood ex Carruth. | Carruth's sagewort | Asteraceae
|
| ARCAC3 | Artemisia caudata Michx. var. calvens Lunell | Artemisia campestris ssp. caudata | Asteraceae
|
| ARCA24 | Artemisia caudata Michx. | Artemisia campestris ssp. caudata | Asteraceae
|
| ARCI8 | Artemisia cina O. Berg & C. F. Schmidt | santonica | Asteraceae
|
| ARCO22 | Artemisia comata Rydb. | Artemisia arctica ssp. comata | Asteraceae
|
| ARDI15 | Artemisia diversifolia Rydb. | Artemisia ludoviciana ssp. ludoviciana | Asteraceae
|
| ARDO3 | Artemisia douglasiana Bess. | Douglas' sagewort | Asteraceae
|
| ARDRD | Artemisia dracunculoides Pursh var. dracunculina (S. Wats.) Blake | Artemisia dracunculus | Asteraceae
|
| ARDR5 | Artemisia dracunculoides Pursh | Artemisia dracunculus | Asteraceae
|