American sycamore 
American trailplant 
American tulip tree 
American water horehound 
American White Waterlily 
American Wintergreen 
American witch-hazel 
Amethyst broomrape 
Amethyst Meadow Squill 
Amethyst sea holly 
Amethyst shooting star 
Ammi majus 
Amorphophallus bufo 
Amorphophallus hildebrandtii 
Amorphophallus titanum 
Amsinckia menziesii 
Amur Honeysuckle 
Amur maple 
Amygdalus orientalis 
Amygdalus ramonensis 
Anabasis aretioides 
Anabasis articulata 
Anabasis setifera 
Anabasis syriaca