Absinthium          

Adderstongue          

Adirondack Blackberry          

Adlumia          

Adorned Hawthorn          

Aethusa          

Agrimony          

Ailanthus          

Alder          

Alfalfa          

Alkali Buttercup      

Alkaligrass          

Allegheny Blackberry      

Allegheny Hawkweed          

Allegheny Monkeyflower          

Allegheny Mountain Buttercup          

Allegheny Serviceberry      

Allegheny Vine          

Alpine Bulrush          

Alpine Sweetvetch      

Alpine Violet          

Alsike Clover      

Alternateflower Watermilfoil          

Alternateleaf Dogwood      

Amberique-bean          

American Alkaligrass          

American Basswood      

American Beachgrass      

American Beech      

American Bittersweet      

American Black Currant      

American Black Elderberry      

American Bur-reed      

American Burnweed          

American Cancer-root          

American Chestnut      

American Climbing Fern          

American Cranberrybush      

American Dragonhead          

American Eelgrass      

American Elm      

American False Pennyroyal          

American Featherfoil          

American Ginseng