1. Concave on one side and convex on the other with the concavity being greater than the convexity

See also: concave

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• 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