Yam is a vine plant cultivated for livestock taken tubers, leaves of this plant compound and the bear-formed leaves of three. The flowers are arranged in bunches whose size achieved fifteen to 20 centimeters, downy fruit, pod-shaped and have four to nine seeds, roots tubers white, shaped top and simple to peel skin. Bengkoang originally derived from tropical America, and spread more than other tropical regions. Chemicalconstituents in yam is pachyrhizon, rotenon, vitamin B1 and vitamin C.
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