Acicarpha          

Acid-loving Sedge          

Aethusa          

African Amaranth          

Airplant          

Alabama Arrowwood          

Alabama Blazing Star          

Alabama Gladecress          

Alabama Milkvine          

Alabama Swamp Flatsedge          

Alabama Warbonnet          

Alder          

Allegheny Hawkweed          

Allegheny-spurge          

Alligatorweed      

Aloe Yucca      

Alternateleaf Dogwood      

American Barberry          

American Bellflower      

American Bittersweet      

American Black Elderberry      

American Burnweed          

American Everlasting          

American Ginseng          

American Hazelnut      

American Holly      

American Hornbeam      

American Nailwort          

American Searocket          

American Smoketree          

American Spikenard          

American Umbrellaleaf          

American Water Plantain      

American Water-willow      

American Wild Carrot          

Ammi          

Angelica          

Angularfruit Milkvine          

Anisescented Goldenrod          

Annual Marsh Elder          

Annual Ragweed          

Annual Seepweed          

Annual Trampweed          

Annual Wallrocket