Aaron's Rod          

Absinthium          

Acinos          

Adam And Eve          

Adam's Needle          

Adder's-mouth Orchid          

Addersmeat          

Adderstongue          

Addison's Rosette Grass          

Adlumia          

Adorned Hawthorn          

Aethusa          

Agrimony          

Agueweed          

Ailanthus          

Albizia          

Alder          

Alderleaf Buckthorn      

Alfalfa          

Alkali Buttercup      

Alkaligrass          

Allegheny Blackberry      

Allegheny Hawkweed          

Allegheny Monkeyflower          

Allegheny Mountain Buttercup          

Allegheny Plum          

Allegheny Serviceberry      

Allegheny Stonecrop          

Allegheny-spurge          

Alliaria          

Alpine Bulrush          

Alpine Pondweed          

Alpine Violet          

Alsike Clover      

Alternateflower Watermilfoil          

Alternateleaf Dogwood      

Alumroot          

Amberique-bean          

American Alumroot          

American Basswood      

American Beachgrass      

American Beech      

American Bird's-foot Trefoil          

American Bittersweet