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  • genus argyroxiphium
  • genus arilus
  • genus ariocarpus
  • genus ariomma
  • genus arisaema
  • genus arisarum
  • genus aristolochia
  • genus aristotelia
  • genus arius
  • genus arizona
  • genus armadillidium
  • genus armeria
  • genus armillaria
  • genus armillariella
  • genus armoracia
  • genus arnica
  • genus arnoseris
  • genus arrhenatherum
  • genus artamus
  • genus artemia
  • genus artemisia
  • genus arthropteris
  • genus artocarpus
  • genus arum
  • genus arundinaria
  • genus arundo
  • genus arvicola
  • genus asarum
  • genus ascaphus
  • genus ascaridia
  • genus ascaris
  • genus asclepias
  • genus ascophyllum
  • genus asimina
  • genus asio
  • genus aspalathus
  • genus asparagus
  • genus aspergillus
  • genus asperula
  • genus asphodeline
  • genus asphodelus
  • genus aspidelaps
  • genus aspidiotus
  • genus aspidistra
  • genus aspidophoroides
  • genus aspis
  • genus asplenium
  • genus astacus
  • genus aster
  • genus astilbe
  • genus astragalus
  • genus astrantia
  • genus astreus
  • genus astroloma
  • genus astronium
  • genus astrophyton
  • genus astropogon
  • genus ateles
  • genus athene
  • genus atherinopsis
  • genus atherurus
  • genus athrotaxis
  • genus athyrium
  • genus atrichornis
  • genus atriplex
  • genus atropa
  • genus attalea
  • genus atticus
  • genus aucuba
  • genus aulacorhyncus
  • genus aulostomus
  • genus aureolaria
  • genus auricularia
  • genus auriparus
  • genus australopithecus
  • genus austrocedrus
  • genus austrotaxus
  • genus automeris
  • genus avahi
  • genus avena
  • genus averrhoa
  • genus avicennia
  • genus ayapana
  • genus aythya
  • genus azadirachta
  • genus azolla
  • genus babesia
  • genus babyrousa
  • genus baccharis
  • genus bacillus
  • genus bacteroides
  • genus baiomys
  • genus bairdiella
  • genus balaena
  • genus balaeniceps
  • genus balaenoptera
  • genus balanus
  • genus balistes
  • genus ballota
  • genus balsamorhiza
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