| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ARDIA | Aruncus dioicus (Walt.) Fern. var. acuminatus (Rydb.) Rydb. ex Hara | bride's feathers | Rosaceae
|
| ARDID2 | Aruncus dioicus (Walt.) Fern. var. dioicus | bride's feathers | Rosaceae
|
| ARDIP | Aruncus dioicus (Walt.) Fern. var. pubescens (Rydb.) Fern. | bride's feathers | Rosaceae
|
| ARDIV | Aruncus dioicus (Walt.) Fern. var. vulgaris (Maxim.) Hara | bride's feathers | Rosaceae
|
| ARDI8 | Aruncus dioicus (Walt.) Fern. | bride's feathers | Rosaceae
|
| ARPU13 | Aruncus pubescens Rydb. | Aruncus dioicus var. pubescens | Rosaceae
|
| ARSYA | Aruncus sylvester Kostel. ssp. acuminatus (Rydb.) Jepson | Aruncus dioicus var. acuminatus | Rosaceae
|
| ARSY2 | Aruncus sylvester Kostel. | Aruncus dioicus var. vulgaris | Rosaceae
|
| ARVU4 | Aruncus vulgaris (Maxim.) Raf. ex Hara | Aruncus dioicus var. vulgaris | Rosaceae
|
| ARUNC | Aruncus L. | aruncus | Rosaceae
|
| ARBA3 | Arundina bambusifolia (Roxb.) Lindl. | Arundina graminifolia | Orchidaceae
|
| ARGR6 | Arundina graminifolia (D. Don) Hochr. | bamboo orchid | Orchidaceae
|
| ARUND | Arundina Blume | bamboo orchid | Orchidaceae
|
| ARAM6 | Arundinaria amabilis McClure | Tonkin cane | Poaceae
|
| ARGIG | Arundinaria gigantea (Walt.) Muhl. ssp. gigantea | giant cane | Poaceae
|
| ARGIM | Arundinaria gigantea (Walt.) Muhl. ssp. macrosperma (Michx.) McClure | Arundinaria gigantea ssp. gigantea | Poaceae
|
| ARGIT8 | Arundinaria gigantea (Walt.) Muhl. ssp. tecta (Walt.) McClure | switchcane | Poaceae
|
| ARGI | Arundinaria gigantea (Walt.) Muhl. | giant cane | Poaceae
|
| ARJA | Arundinaria japonica Sieb. & Zucc. ex Steud. | Pseudosasa japonica | Poaceae
|
| ARLO11 | Arundinaria longifolia Fourn. | Bambusa longifolia | Poaceae
|
| ARSI6 | Arundinaria simonii (Carr.) A.& C. Rivi�re | Simon bamboo | Poaceae
|
| ARTE4 | Arundinaria tecta (Walt.) Muhl. | Arundinaria gigantea ssp. tecta | Poaceae
|
| ARUND2 | Arundinaria Michx. | cane | Poaceae
|
| ARCO11 | Arundinella confinis (J.A. Schultes) A.S. Hitchc. & Chase | rabo de gato | Poaceae
|
| ARUND3 | Arundinella Raddi | rabo de gato | Poaceae
|
| ARDOV | Arundo donax L. var. versicolor (P. Mill.) Stokes | Arundo donax | Poaceae
|
| ARDO4 | Arundo donax L. | giant reed | Poaceae
|
| ARFE7 | Arundo festucacea Willd. | Scolochloa festucacea | Poaceae
|
| ARSE10 | Arundo semiannularis Labill. | Rytidosperma semiannulare | Poaceae
|
| ARTE5 | Arundo tecta Walt. | Arundinaria gigantea ssp. tecta | Poaceae
|
| ARVE2 | Arundo versicolor P. Mill. | Arundo donax | Poaceae
|
| ARUND4 | Arundo L. | giant reed | Poaceae
|
| ASCH60 | Asahinea chrysantha (Tuck.) Culb. & C. Culb. | | Parmeliaceae
|
| ASSC60 | Asahinea scholanderi (Llano) Culb. & C. Culb. | | Parmeliaceae
|
| ASAHI2 | Asahinea Culb. & C. Culb. | asahinea | Parmeliaceae
|
| ASSQ | Asanthus squamulosus (Gray) King & H.E. Robins. | Mule Mountain brickellbush | Asteraceae
|
| ASANT2 | Asanthus King & H.E. Robins. | brickellbush | Asteraceae
|
| ASAC9 | Asarina acerifolia (Pennell) Pennell | Mabrya acerifolia | Scrophulariaceae
|
| ASAN11 | Asarina antirrhiniflora (Humb. & Bonpl. ex Willd.) Pennell | Maurandella antirrhiniflora | Scrophulariaceae
|
| ASFI4 | Asarina filipes (Gray) Pennell | Neogaerrhinum filipes | Scrophulariaceae
|
| ASPE13 | Asarina petrophila (Coville & Morton) Pennell | Holmgrenanthe petrophila | Scrophulariaceae
|
| ASST15 | Asarina stricta (Hook. & Arn.) Pennell | Neogaerrhinum strictum | Scrophulariaceae
|
| ASWI5 | Asarina wislizeni (Engelm. ex Gray) Pennell | Epixiphium wislizeni | Scrophulariaceae
|
| ASAC7 | Asarum acuminatum (Ashe) Bickn. | Asarum canadense | Aristolochiaceae
|
| ASARC | Asarum arifolium Michx. var. callifolia (Small) Barringer | Hexastylis arifolia var. callifolia | Aristolochiaceae
|
| ASARR | Asarum arifolium Michx. var. ruthii (Ashe) Barringer | Hexastylis arifolia var. ruthii | Aristolochiaceae
|
| ASAR10 | Asarum arifolium Michx. | Hexastylis arifolia var. arifolia | Aristolochiaceae
|
| ASCA33 | Asarum callifolium Small | Hexastylis arifolia var. callifolia | Aristolochiaceae
|
| ASCAA | Asarum canadense L. var. acuminatum Ashe | Asarum canadense | Aristolochiaceae
|
| ASCAA2 | Asarum canadense L. var. ambiguum (Bickn.) Farw. | Asarum canadense | Aristolochiaceae
|
| ASCAR | Asarum canadense L. var. reflexum (Bickn.) B.L. Robins. | Asarum canadense | Aristolochiaceae
|
| ASCA | Asarum canadense L. | Canadian wildginger | Aristolochiaceae
|
| ASCAC2 | Asarum caudatum Lindl. var. caudatum | British Columbia wildginger | Aristolochiaceae
|
| ASCAV | Asarum caudatum Lindl. var. viridiflorum M.E. Peck | longtail wildginger | Aristolochiaceae
|
| ASCA2 | Asarum caudatum Lindl. | British Columbia wildginger | Aristolochiaceae
|
| ASCO55 | Asarum contractum (Blomquist) Barringer | Hexastylis contracta | Aristolochiaceae
|
| ASHA | Asarum hartwegii S. Wats. | Hartweg's wildginger | Aristolochiaceae
|
| ASHE5 | Asarum heterophyllum Ashe | Hexastylis heterophylla | Aristolochiaceae
|
| ASLE | Asarum lemmonii S. Wats. | Lemmon's wildginger | Aristolochiaceae
|
| ASLE12 | Asarum lewisii Fern. | Hexastylis lewisii | Aristolochiaceae
|
| ASMA8 | Asarum marmoratum Piper | marbled wildginger | Aristolochiaceae
|
| ASME10 | Asarum memmingeri Ashe | Hexastylis virginica | Aristolochiaceae
|
| ASMI11 | Asarum minus Ashe | Hexastylis minor | Aristolochiaceae
|
| ASRE10 | Asarum reflexum Bickn. | Asarum canadense | Aristolochiaceae
|
| ASRU9 | Asarum rubrocinctum Peattie | Asarum canadense | Aristolochiaceae
|
| ASRU8 | Asarum ruthii Ashe | Hexastylis arifolia var. ruthii | Aristolochiaceae
|
| ASSHH | Asarum shuttleworthii Britten & Baker var. harperi (Gaddy) Barringer | Hexastylis shuttleworthii var. harperi | Aristolochiaceae
|
| ASSH4 | Asarum shuttleworthii Britten & Baker | Hexastylis shuttleworthii var. shuttleworthii | Aristolochiaceae
|
| ASSP18 | Asarum speciosum (Harper) Barringer | Hexastylis speciosa | Aristolochiaceae
|
| ASVI8 | Asarum virginicum L. | Hexastylis virginica | Aristolochiaceae
|
| ASWA6 | Asarum wagneri Lu & Mesler | Asarum caudatum var. viridiflorum | Aristolochiaceae
|
| ASARU | Asarum L. | wildginger | Aristolochiaceae
|
| ASDI14 | Ascarina diffusa A.C. Smith | | Chloranthaceae
|
| ASCAR2 | Ascarina J.R. & G. Forst. | | Chloranthaceae
|
| ASKA5 | Aschisma kansanum Andrews | Kansas aschisma moss | Pottiaceae
|
| ASCHI2 | Aschisma Lindb. | aschisma moss | Pottiaceae
|
| ASBLA | Ascidiota blepharophylla C. Massal. ssp. alaskana Steere & R. M. Schust. | | Porellaceae
|
| ASBL6 | Ascidiota blepharophylla C. Massal. | | Porellaceae
|
| ASCID | Ascidiota C. Massal. | | Porellaceae
|
| ASAC8 | Asclepias aceratoides Nash | Asclepias curtissii | Asclepiadaceae
|
| ASAL | Asclepias albicans S. Wats. | whitestem milkweed | Asclepiadaceae
|
| ASAM | Asclepias amplexicaulis Sm. | clasping milkweed | Asclepiadaceae
|
| ASAN5 | Asclepias angustifolia Schweig. | Arizona milkweed | Asclepiadaceae
|
| ASAR | Asclepias arenaria Torr. | sand milkweed | Asclepiadaceae
|
| ASASA | Asclepias asperula (Dcne.) Woods. ssp. asperula | spider milkweed | Asclepiadaceae
|
| ASASC | Asclepias asperula (Dcne.) Woods. ssp. capricornu (Woods.) Woods. | antelopehorns | Asclepiadaceae
|
| ASASD | Asclepias asperula (Dcne.) Woods. var. decumbens (Nutt.) Shinners | Asclepias asperula ssp. capricornu | Asclepiadaceae
|
| ASAS | Asclepias asperula (Dcne.) Woods. | spider milkweed | Asclepiadaceae
|
| ASAU5 | Asclepias auriculata (Engelm. ex Torr.) Holz. | Asclepias engelmanniana | Asclepiadaceae
|
| ASBI11 | Asclepias bicknellii Vail | Asclepias exaltata | Asclepiadaceae
|
| ASBR | Asclepias brachystephana Engelm. ex Torr. | bract milkweed | Asclepiadaceae
|
| ASBR15 | Asclepias brevicornu Scheele | Asclepias oenotheroides | Asclepiadaceae
|
| ASCAC3 | Asclepias californica Greene ssp. californica | California milkweed | Asclepiadaceae
|
| ASCAG | Asclepias californica Greene ssp. greenei Woods. | Greene's milkweed | Asclepiadaceae
|
| ASCA3 | Asclepias californica Greene | California milkweed | Asclepiadaceae
|
| ASCAO | Asclepias capricornu Woods. ssp. occidentalis Woods. | Asclepias asperula ssp. capricornu | Asclepiadaceae
|
| ASCA24 | Asclepias capricornu Woods. | Asclepias asperula ssp. capricornu | Asclepiadaceae
|
| ASCA31 | Asclepias carnosa L. f. | Hoya carnosa | Asclepiadaceae
|
| ASCI5 | Asclepias cinerea Walt. | Carolina milkweed | Asclepiadaceae
|
| ASCO19 | Asclepias connivens Baldw. | largeflower milkweed | Asclepiadaceae
|
| ASCO | Asclepias cordifolia (Benth.) Jepson | heartleaf milkweed | Asclepiadaceae
|