Arrhopalites aggtelekiensis 
Arrhythmus rugosipennis 
Arrow Crab 
Arrow Sphinx 
Arrow-leaf buckwheat 
Arrow-marked babbler 
Arrow-shaped Orbweaver 
Arrowhead 
Arrowhead crab 
Arrowhead spider 
Arrowleaf Balsamroot 
Arrowleaf Clover 
Arrowleaf Elephant's Ear 
Arrowleaf Groundsel 
Arrowleaf sida 
Arrowleaf Tearthumb 
Arrowleaf violet 
Arsenic bush 
Arsenura armida 
Arsenura batesii 
Arsenura ciocolatina 
Arsipoda chrysis 
Arsipoda montana 
Artabrus erythrocephalus