Apache Beggarticks 
Aposeris 
Arctic sweet coltsfoot 
Arenaria deflexa 
Argentipallium obtusifolium 
Arnica latifolia 
Arnica parryi 
Aromatic Aster 
Arrowleaf Balsamroot 
Arrowleaf Groundsel 
Artemisia arbuscula 
Artemisia jordanica 
Artemisia judaica 
Artemisia schmidtiana 
Artemisia sieberi 
Aspen Fleabane 
Aster alpinus 
Asteriscus hierochunticus 
Atractylis carduus 
Atractylis gummifera 
Atractylis phaeolepis 
Atractylis prolifera 
Autumn Goldenrod 
baccharis neglecta