| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ARMAK2 | Arenaria macradenia S. Wats. ssp. macradenia var. kuschei (Eastw.) Maguire | Forest Camp sandwort | Caryophyllaceae
|
| ARMAM4 | Arenaria macradenia S. Wats. ssp. macradenia var. macradenia | Mojave sandwort | Caryophyllaceae
|
| ARMAM | Arenaria macradenia S. Wats. ssp. macradenia | Mojave sandwort | Caryophyllaceae
|
| ARMAP | Arenaria macradenia S. Wats. var. parishiorum B.L. Robins. | Arenaria macradenia ssp. macradenia var. macradenia | Caryophyllaceae
|
| ARMA3 | Arenaria macradenia S. Wats. | Mojave sandwort | Caryophyllaceae
|
| ARMA12 | Arenaria macrantha (Rydb.) A. Nels. ex Coult. & A. Nels. | Minuartia macrantha | Caryophyllaceae
|
| ARMA15 | Arenaria macrocarpa Pursh | Minuartia macrocarpa | Caryophyllaceae
|
| ARMA18 | Arenaria macrophylla Hook. | Moehringia macrophylla | Caryophyllaceae
|
| ARMA14 | Arenaria marcescens Fern. | Minuartia marcescens | Caryophyllaceae
|
| ARMI13 | Arenaria michauxii (Fenzl) Hook. f. | Minuartia michauxii var. michauxii | Caryophyllaceae
|
| ARMU4 | Arenaria muriculata Maguire | Minuartia muscorum | Caryophyllaceae
|
| ARNA | Arenaria nardifolia Ledeb. | Arenaria capillaris ssp. capillaris | Caryophyllaceae
|
| ARNUF | Arenaria nuttallii Pax ssp. fragilis Maguire & A. Holmgren | Minuartia nuttallii ssp. fragilis | Caryophyllaceae
|
| ARNUG | Arenaria nuttallii Pax ssp. gracilis (B.L. Robins.) Maguire | Minuartia nuttallii ssp. gracilis | Caryophyllaceae
|
| ARNUG4 | Arenaria nuttallii Pax ssp. gregaria (Heller) Maguire | Minuartia nuttallii ssp. gregaria | Caryophyllaceae
|
| ARNUF2 | Arenaria nuttallii Pax var. fragilis (Maguire & A. Holmgren) C.L. Hitchc. | Minuartia nuttallii ssp. fragilis | Caryophyllaceae
|
| ARNUG2 | Arenaria nuttallii Pax var. gracilis B.L. Robins. | Minuartia nuttallii ssp. gracilis | Caryophyllaceae
|
| ARNUG3 | Arenaria nuttallii Pax var. gregaria (Heller) Jepson | Minuartia nuttallii ssp. gregaria | Caryophyllaceae
|
| ARNU5 | Arenaria nuttallii Pax | Minuartia nuttallii ssp. nuttallii | Caryophyllaceae
|
| AROB3 | Arenaria obtusiloba (Rydb.) Fern. | Minuartia obtusiloba | Caryophyllaceae
|
| ARPA7 | Arenaria paludicola B.L. Robins. | marsh sandwort | Caryophyllaceae
|
| ARPAR | Arenaria patula Michx. var. robusta (Steyermark) McNeill | Minuartia muscorum | Caryophyllaceae
|
| ARPA27 | Arenaria patula Michx. | Minuartia patula | Caryophyllaceae
|
| ARPED | Arenaria peploides L. var. diffusa Hornem. | Honckenya peploides ssp. diffusa | Caryophyllaceae
|
| ARPEM | Arenaria peploides L. var. major Hook. | Honckenya peploides ssp. major | Caryophyllaceae
|
| ARPEM2 | Arenaria peploides L. var. maxima Fern. | Honckenya peploides ssp. major | Caryophyllaceae
|
| ARPER2 | Arenaria peploides L. var. robusta Fern. | Honckenya peploides ssp. robusta | Caryophyllaceae
|
| ARPE13 | Arenaria peploides L. p.p. | Honckenya peploides ssp. diffusa | Caryophyllaceae
|
| ARPH | Arenaria physodes Fisch. ex Ser. | Wilhelmsia physodes | Caryophyllaceae
|
| ARPR5 | Arenaria propinqua Richards. | Minuartia rubella | Caryophyllaceae
|
| ARPUC | Arenaria pumicola Coville & Leib. var. californica Maguire | Arenaria aculeata | Caryophyllaceae
|
| ARPU6 | Arenaria pumicola Coville & Leib. | Crater Lake sandwort | Caryophyllaceae
|
| ARPU16 | Arenaria pungens Nutt. | Minuartia nuttallii ssp. nuttallii | Caryophyllaceae
|
| ARPUD2 | Arenaria pusilla S. Wats. var. diffusa Maguire | Minuartia pusilla var. diffusa | Caryophyllaceae
|
| ARPU15 | Arenaria pusilla S. Wats. | Minuartia pusilla var. pusilla | Caryophyllaceae
|
| ARRO7 | Arenaria rosei Maguire & Barneby | Minuartia rosei | Caryophyllaceae
|
| ARROC2 | Arenaria rossii R. Br. ex Richards. ssp. columbiana (Raup) Maguire | Minuartia elegans | Caryophyllaceae
|
| ARROC | Arenaria rossii R. Br. ex Richards. ssp. columbiana auct. non (Raup) Maguire | Minuartia austromontana | Caryophyllaceae
|
| ARROE | Arenaria rossii R. Br. ex Richards. ssp. elegans (Cham. & Schlecht.) Maguire | Minuartia elegans | Caryophyllaceae
|
| ARROA | Arenaria rossii R. Br. ex Richards. var. apetala Maguire | Minuartia elegans | Caryophyllaceae
|
| ARROC4 | Arenaria rossii R. Br. ex Richards. var. columbiana auct. non Raup | Minuartia austromontana | Caryophyllaceae
|
| ARROC3 | Arenaria rossii R. Br. ex Richards. var. corollina Fenzl | Minuartia elegans | Caryophyllaceae
|
| ARROD | Arenaria rossii R. Br. ex Richards. var. daethiana Polunin | Minuartia rossii | Caryophyllaceae
|
| ARROE2 | Arenaria rossii R. Br. ex Richards. var. elegans (Cham. & Schlecht.) Welsh | Minuartia elegans | Caryophyllaceae
|
| ARRO8 | Arenaria rossii R. Br. ex Richards. | Minuartia rossii | Caryophyllaceae
|
| ARRUF | Arenaria rubella (Wahlenb.) Sm. var. filiorum (Maguire) Welsh | Minuartia filiorum | Caryophyllaceae
|
| ARRU5 | Arenaria rubella (Wahlenb.) Sm. | Minuartia rubella | Caryophyllaceae
|
| ARSA7 | Arenaria sajanensis Willd. ex Schlecht. | Minuartia biflora | Caryophyllaceae
|
| ARSA8 | Arenaria sajanensis auct. non Willd. ex Schlecht. | Minuartia obtusiloba | Caryophyllaceae
|
| ARSA10 | Arenaria salmonensis Henderson | Arenaria aculeata | Caryophyllaceae
|
| ARSAC | Arenaria saxosa Gray var. cinerascens B.L. Robins. | Arenaria lanuginosa ssp. saxosa | Caryophyllaceae
|
| ARSAM2 | Arenaria saxosa Gray var. mearnsii (Woot. & Standl.) Kearney & Peebles | Arenaria lanuginosa ssp. saxosa | Caryophyllaceae
|
| ARSA11 | Arenaria saxosa Gray | Arenaria lanuginosa ssp. saxosa | Caryophyllaceae
|
| ARSEL | Arenaria serpyllifolia L. ssp. leptoclados (Reichenb.) Nyman | Arenaria serpyllifolia | Caryophyllaceae
|
| ARSET | Arenaria serpyllifolia L. var. tenuior Mert. & Koch | Arenaria serpyllifolia | Caryophyllaceae
|
| ARSE2 | Arenaria serpyllifolia L. | thymeleaf sandwort | Caryophyllaceae
|
| ARST3 | Arenaria stenomeres Eastw. | Meadow Valley sandwort | Caryophyllaceae
|
| ARSTA | Arenaria stephaniana (Willd.) Shinners var. americana (Porter ex B.L. Robins.) Shinners | Stellaria americana | Caryophyllaceae
|
| ARSTD | Arenaria stricta Michx. ssp. dawsonensis (Britt.) Maguire | Minuartia dawsonensis | Caryophyllaceae
|
| ARSTM | Arenaria stricta Michx. ssp. macra (A. Nels. & J.F. Macbr.) Maguire | Minuartia michauxii var. michauxii | Caryophyllaceae
|
| ARSTT3 | Arenaria stricta Michx. ssp. texana (B.L. Robins.) Maguire | Minuartia michauxii var. texana | Caryophyllaceae
|
| ARSTD2 | Arenaria stricta Michx. var. dawsonensis (Britt.) Scoggan | Minuartia dawsonensis | Caryophyllaceae
|
| ARSTL | Arenaria stricta Michx. var. litorea (Fern.) Britt. | Minuartia dawsonensis | Caryophyllaceae
|
| ARSTP | Arenaria stricta Michx. var. puberulenta (M.E. Peck) C.L. Hitchc. | Minuartia michauxii var. michauxii | Caryophyllaceae
|
| ARSTT2 | Arenaria stricta Michx. var. texana B.L. Robins. | Minuartia michauxii var. texana | Caryophyllaceae
|
| ARSTU | Arenaria stricta Michx. var. uliginosa (Schleich. ex Lam. & DC.) Boivin | Minuartia michauxii var. michauxii | Caryophyllaceae
|
| ARST8 | Arenaria stricta Michx. | Minuartia michauxii var. michauxii | Caryophyllaceae
|
| ARSU8 | Arenaria subcongesta (S. Wats.) Rydb. | Arenaria congesta var. subcongesta | Caryophyllaceae
|
| ARTE15 | Arenaria tenella Nutt. | Minuartia tenella | Caryophyllaceae
|
| ARTE8 | Arenaria texana (B.L. Robins.) Britt. | Minuartia michauxii var. texana | Caryophyllaceae
|
| ARUI2 | Arenaria uintahensis A. Nels. | Arenaria kingii ssp. uintahensis | Caryophyllaceae
|
| ARUL2 | Arenaria uliginosa Schleich. ex Lam. & DC. | Minuartia michauxii var. michauxii | Caryophyllaceae
|
| ARUN3 | Arenaria uniflora (Walt.) Muhl. | Minuartia uniflora | Caryophyllaceae
|
| ARUR | Arenaria ursina B.L. Robins. | Bear Valley sandwort | Caryophyllaceae
|
| ARVEP | Arenaria verna L. var. propinqua (Richards.) Fern. | Minuartia rubella | Caryophyllaceae
|
| ARVER | Arenaria verna L. var. rubella (Wahlenb.) S. Wats. | Minuartia rubella | Caryophyllaceae
|
| ARENA | Arenaria L. | sandwort | Caryophyllaceae
|
| ARPI6 | Arenga pinnata (Wurmb) Merr. | sugar palm | Arecaceae
|
| ARSA15 | Arenga saccharifera Labill. ex DC. | Arenga pinnata | Arecaceae
|
| ARENG | Arenga Labill. | arenga palm | Arecaceae
|
| ARBU | Arethusa bulbosa L. | dragon's mouth | Orchidaceae
|
| ARRA3 | Arethusa racemosa Walt. | Ponthieva racemosa | Orchidaceae
|
| ARETH | Arethusa L. | dragon's mouth | Orchidaceae
|
| ARAE | Argemone aenea G.B. Ownbey | golden pricklypoppy | Papaveraceae
|
| ARAL9 | Argemone alba Lestib. f. | Argemone albiflora ssp. albiflora | Papaveraceae
|
| ARALA2 | Argemone albiflora Hornem. ssp. albiflora | bluestem pricklypoppy | Papaveraceae
|
| ARALT | Argemone albiflora Hornem. ssp. texana G.B. Ownbey | bluestem pricklypoppy | Papaveraceae
|
| ARALT4 | Argemone albiflora Hornem. var. texana (G.B. Ownbey) Shinners | Argemone albiflora ssp. texana | Papaveraceae
|
| ARAL3 | Argemone albiflora Hornem. | bluestem pricklypoppy | Papaveraceae
|
| ARAR4 | Argemone arizonica G.B. Ownbey | Arizona pricklypoppy | Papaveraceae
|
| ARAU2 | Argemone aurantiaca G.B. Ownbey | Texas pricklypoppy | Papaveraceae
|
| ARBI8 | Argemone bipinnatifida Greene | Argemone hispida | Papaveraceae
|
| ARCH2 | Argemone chisosensis G.B. Ownbey | Chisos Mountain pricklypoppy | Papaveraceae
|
| ARCOA | Argemone corymbosa Greene ssp. arenicola G.B. Ownbey | Mojave pricklypoppy | Papaveraceae
|
| ARCOC6 | Argemone corymbosa Greene ssp. corymbosa | Mojave pricklypoppy | Papaveraceae
|
| ARCOA2 | Argemone corymbosa Greene var. arenicola (G.B. Ownbey) Shinners | Argemone corymbosa ssp. arenicola | Papaveraceae
|
| ARCO6 | Argemone corymbosa Greene | Mojave pricklypoppy | Papaveraceae
|
| ARGLD | Argemone glauca (Nutt. ex Prain) Pope var. decipiens G.B. Ownbey | smooth pricklypoppy | Papaveraceae
|
| ARGLG5 | Argemone glauca (Nutt. ex Prain) Pope var. glauca | smooth pricklypoppy | Papaveraceae
|
| ARGLI | Argemone glauca (Nutt. ex Prain) Pope var. inermis O.& I. Deg. | Argemone glauca var. glauca | Papaveraceae
|
| ARGL10 | Argemone glauca (Nutt. ex Prain) Pope | smooth pricklypoppy | Papaveraceae
|