American Lotus      

American Melonleaf          

American Nailwort          

American Plum      

American Pokeweed      

American Scurfpea          

American Searocket          

American Snowbell      

American Spongeplant      

American Sycamore      

American Water Horehound      

American Water-willow      

American White Waterlily          

American Wild Carrot          

American Wisteria      

American Witchhazel      

Amianthium          

Ammi          

Amphitecna          

Anchored Water Hyacinth          

Andira          

Anemia Fern          

Anemone          

Angelica          

Angelon          

Angelwing Jasmine          

Anglestem Beaksedge          

Anglestem Primrose-willow          

Angleton Bluestem      

Anglevein Fern          

Angularfruit Milkvine          

Anil De Pasto          

Aniseia          

Anisescented Goldenrod          

Anisetree          

Annona          

Annual Blue-eyed Grass          

Annual Bluegrass      

Annual Canarygrass          

Annual Fescue          

Annual Fimbry          

Annual Marsh Elder          

Annual Phlox          

Annual Rabbitsfoot Grass