Dioscorea deltoidea, the Nepal yam, is a species of flowering plant in the family Dioscoreaceae. Its native range is the Himalayas through to south-central China and mainland Southeast Asia. Its tubers contain diosgenin and are harvested by local peoples as a treatment for a variety of conditions, including gastrointestinal disorders and intestinal worms. Tubers are also eaten after boiling, washing, and baking. It grows in forests and humus-rich soils.

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