Yam (Dioscorea spp.), is widely cultivated in tropical regions and serves as food in Central and South America, in Africa, Asia and in the Pacific Islands. The Dioscorea genus contains more than 600 species, 14 of which have edible tubers.
Dioscorea caucasica -Caucasus Yam Root
Dioscorea hemicrypta - ornamental caudex plant with semiperennial to perennial vines with small, heart shaped leaves and small, axillary yellowish flowers.
Dioscorea rotundata, D.cavensis, D. esculenta -Came Blanco, Nyame, Yam. The most popular yam in West Africa.
Dioscorea sylvatica (Testudinaria sylvatica) - caudex plant from South Africa, related to Dioscorea elephantipes.