1. Flowing inward
   - influent

See also: incoming

• 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