genus Aegilops genus Aegypius genus Aegyptopithecus genus Aeonium genus Aepyceros genus Aepyornis genus Aerides genus Aerobacter genus Aeschynanthus genus Aesculus
  | genus Aethionema genus Aethusa genus Aetobatus genus Aframomum genus Afrocarpus genus Afropavo (current term) genus Agalinis genus Agama genus Agapanthus genus Agaricus
  | genus Agastache genus Agathis genus Agave genus Agdestis genus Agelaius genus Ageratina genus Ageratum genus Agkistrodon genus Aglaomorpha
  |