dioscorea alata
- n grown in Australasia and Polynesia for its large root with fine edible white flesh
dioscorea batata
- n hardy Chinese vine naturalized in United States and cultivated as an ornamental climber for its glossy heart-shaped cinnamon-scented leaves and in the tropics for its edible tubers
dioscorea bulbifera
- n yam of tropical Africa and Asia cultivated for it large tubers