Absinthium          

Acadian Quillwort          

Acinos          

Actinidia          

Adam And Eve          

Addersmeat          

Adderstongue          

Adlumia          

Adorned Hawthorn          

Aethusa          

Agrimony          

Agueweed          

Ailanthus          

Albizia          

Alder          

Alfalfa          

Alkali Buttercup      

Alkali Sandspurry          

Alkaligrass          

Allegheny Blackberry      

Allegheny Hawkweed          

Allegheny Monkeyflower          

Allegheny Mountain Buttercup          

Allegheny Plum          

Allegheny Serviceberry      

Allegheny Vine          

Alliaria          

Alpine Bulrush          

Alpine Knapweed          

Alpine Pondweed          

Alpine Violet          

Alps Yarrow          

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 Bladdernut