1. Not involving zero

See also: cardinal

• genus Aix
• genus Ajaia
• genus Ajuga
• genus Alauda
• genus Albatrellus
• genus Albizia
• genus Albizzia
• genus Albuca
• genus Albugo
• genus Albula
• genus Alca
• genus Alcea
• genus Alcedo
• genus Alcelaphus
• genus Alces
• genus Aldrovanda
• genus Alectis
• genus Alectoria
• genus Alectoris
• genus Alectura
• genus Alepisaurus
• genus Aletris
• genus Aleurites
• genus Aleyrodes
• genus Algeripithecus