American Water Plantain      

American Water Starwort          

American Water-willow      

American Waterwort          

American White Waterlily          

American Wild Carrot          

American Wintergreen          

American Wisteria      

American Witchhazel      

Amianthium          

Amur Honeysuckle      

Amur Privet      

Anemone          

Angelica          

Anglestem Beaksedge          

Anglestem Primrose-willow          

Angularfruit Milkvine          

Anisescented Goldenrod          

Annual Bastardcabbage          

Annual Bluegrass      

Annual Canarygrass          

Annual Fescue          

Annual Fimbry          

Annual Honesty          

Annual Marsh Elder          

Annual Phlox          

Annual Rabbitsfoot Grass      

Annual Ragweed          

Annual Silver Hairgrass          

Annual Vernalgrass          

Anoda          

Appalachian Avens          

Appalachian Barren Strawberry          

Appalachian Blazing Star      

Appalachian Bristle Fern          

Appalachian Bugbane          

Appalachian Bunchflower          

Appalachian Cliff Fern          

Appalachian Clubmoss          

Appalachian Gentian          

Appalachian Gooseberry          

Appalachian Polypody          

Appalachian Quillwort          

Appalachian Rose Gentian