Aaronsohnia factorovskyi 
Acantholepis orientalis 
Achillea aleppica 
Achillea cretica 
Achillea falcata 
Achillea fragrantissima 
Adenostyles alpina 
Aetheopappus pulcherrimus 
Aldama grandiflora 
Alpine Coltsfoot 
Alpine lake false dandelion 
American Basketflower 
American bellflower 
American Burnweed 
American Saw-wort 
American trailplant 
Anacyclus nigellifolius 
Andryala glandulosa 
Angled lobelia 
Angled-stem Dampiera 
Annual fleabane 
Annual Ragweed 
Annual Sumpweed 
Antennaria dioica