Absinthium          

Adderstongue          

Adonis Blazingstar          

African Dogstooth Grass          

Agoseris          

Agrimony          

Ailanthus          

Alderleaf Mountain Mahogany      

Alfalfa          

Alfalfa Dodder          

Alkali Buttercup      

Alkali Cordgrass      

Alkali Sacaton      

Alkaligrass          

Allegheny Blackberry      

Allegheny Monkeyflower          

Alliaria          

Alpine Bladderpod          

Alpine Golden Buckwheat          

Alpine Leafybract Aster          

Alpine Sweetvetch      

Alsike Clover      

Alumroot          

Alyssum          

Alyssumleaf Phlox          

Amberique-bean          

American Alumroot          

American Basswood      

American Bellflower      

American Bittersweet      

American Black Currant      

American Black Elderberry      

American Bladdernut          

American Bugseed          

American Burnweed          

American Cranberrybush      

American Dragonhead          

American Elm      

American False Pennyroyal          

American Ginseng          

American Hazelnut      

American Hogpeanut          

American Licorice      

American Lopseed