1. North American annual with red or rose-coloured flowers
   - prairie bird's-foot trefoil, compass plant, prairie lotus, prairie trefoil

Type of: subshrub, suffrutex

• genus Anthemis
• genus Antheraea
• genus Anthericum
• genus Antheropeas
• genus Anthidium
• genus Anthoceros
• genus Anthonomus
• genus Anthriscus
• genus Anthurium
• genus Anthus
• genus Anthyllis
• genus Antidorcas
• genus Antigonia
• genus Antilocapra
• genus Antilope
• genus Antirrhinum
• genus Antrodemus
• genus Antrozous
• genus Aotus
• genus Apatosaurus
• genus Apatura
• genus Aphis
• genus Aphriza
• genus Aphrophora
• genus Aphyllanthes