Dioscorea rotundata

Dioscorea cayenensis subsp. rotundata
White yam
Scientific classification
Kingdom:	Plantae
Clade:	Angiosperms
Clade:	Monocots
Order:	Dioscoreales
Family:	Dioscoreaceae
Genus:	Dioscorea
Species:	D. cayenensis
Subspecies:	D. c. subsp. rotundata
Trinomial name
Dioscorea cayenensis subsp. rotundata (Poir.) J.Miège

Dioscorea cayennensis subsp. rotundata, the "white yam", sometimes sold as "Guinea yam" or "white ñame", is a subspecies of yam native to Africa. It is one of the most important cultivated yams.

D. c. subsp. rotundata is grown in West Africa, including countries such as Ivory Coast, Ghana and Nigeria.

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Wikipedia