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 bellflower 
American Saw-wort 
American trailplant 
Anacyclus nigellifolius 
Andryala glandulosa 
Angled lobelia 
Angled-stem Dampiera 
Annual fleabane 
Annual Ragweed 
Annual Sumpweed 
Antennaria dioica 
Antennaria howellii 
Antennaria media