1. Convex on one side and concave on the other with the convexity being greater than the concavity

See also: bulging, convex

• genus Echidnophaga
• genus Echinacea
• genus Echinocactus
• genus Echinocereus
• genus Echinochloa
• genus Echinococcus
• genus Echinops
• genus Echium
• genus Ectopistes
• genus Edaphosaurus
• genus Edmontosaurus
• genus Egeria
• genus Egretta
• genus Eichhornia
• genus Eimeria
• genus Eira
• genus Elaeagnus
• genus Elaeis
• genus Elaeocarpus
• genus Elagatis
• genus Elanoides
• genus Elanus
• genus Elaphe
• genus Elaphurus
• genus Electrophorus