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

See also: concave

• genus Eleutherodactylus
• genus Eliomys
• genus Elodea
• genus Elops
• genus Elsholtzia
• genus Elymus
• genus Emberiza
• genus Embothrium
• genus Emilia
• genus Emmanthe
• genus Empetrum
• genus Encelia
• genus Enceliopsis
• genus Encephalartos
• genus Encyclia
• genus Endamoeba
• genus Engelmannia
• genus Engraulis
• genus Enhydra
• genus Ensete
• genus Ensis
• genus Entandrophragma
• genus Entelea
• genus Enterobius
• genus Enterolobium