Angelica          

Anglestem Beaksedge          

Anglestem Primrose-willow          

Angularfruit Milkvine          

Anil De Pasto          

Anisescented Goldenrod          

Anisetree          

Annual Blue-eyed Grass          

Annual Bluegrass      

Annual Canarygrass          

Annual Fescue          

Annual Fimbry          

Annual Marsh Elder          

Annual Phlox          

Annual Rabbitsfoot Grass      

Annual Ragweed          

Annual Seepweed          

Annual Silver Hairgrass          

Annual Trampweed          

Annual Vernalgrass          

Annual Wildrice      

Annual Yellow Sweetclover          

Anoda          

Antigonon          

Antlerfern          

Apalachicola Toadflax          

Appalachian Blazing Star      

Appalachian Bristle Fern          

Appalachian Mountainmint          

Appalachian Quillwort          

Apple          

Apple Of Peru          

Apteria          

Aquatic Milkweed          

Argentine Senna          

Arizona Signalgrass          

Arkansas Mannagrass          

Arkansas Oak          

Aromatic Aster          

Arrocillo          

Arrow Arum          

Arrowfeather Threeawn          

Arrowgrass          

Arrowhead