Absinthium          

Acicarpha          

Acinos          

Adam And Eve          

Addersmeat          

Adderstongue          

Adirondack Blackberry          

Adlumia          

Adorned Hawthorn          

Aethusa          

Agrimony          

Agueweed          

Ailanthus          

Albizia          

Alder          

Aleutian Maidenhair          

Alfalfa          

Alkali Buttercup      

Alkaligrass          

Allegheny Blackberry      

Allegheny Hawkweed          

Allegheny Monkeyflower          

Allegheny Mountain Buttercup          

Allegheny Plum          

Allegheny Serviceberry      

Allegheny Stonecrop          

Allegheny Vine          

Allegheny-spurge          

Alliaria          

Alpine Pondweed          

Alpine Violet          

Alsike Clover      

Alternateleaf Dogwood      

Alumroot          

Amberique-bean          

American Alkaligrass          

American Alumroot          

American Barberry          

American Basswood      

American Beachgrass      

American Beech      

American Bellflower      

American Bittercress          

American Bittersweet