Binomial name: Dioscorea villosa L. Appearance: White Powder Test Method: HPLC Active Ingredient: Diosgenin/Dioscin/Diosgenine Dioscorea villosa is a species of a twining tuberous vine that is native to eastern North America. It's vine can grow to be 15 feet long during a single season. The leaves are ovate or cordate in shape, with clear veins and entire margins. It is commonly known as wild yam, colic root, rheumatism root, devil's bones, and fourleaf yam. In traditional Russian herbal medicine, saponin extracts from the roots of various varieties of wild yam are thought to be an anticoagulant, antisclerotic, antispasmodic, cholagogue, depurative, diaphoretic, diuretic and a vasodilator. Yam contains vitamin C and mucous protein, can relieve skin aging. Yam contains a lot of minerals, it can replenish sufficient iron, promote hemoglobin synthesis and increase blood volume.