Rhizoma Dioscoreae, alias: Dioscorea, Dioscorea, Dioscoreaceae, Dioscorea, twined with herbaceous vines. Tubers are long and cylindrical, growing vertically, with a length of up to 1 meter, and the cross section is white when dry. Stems are usually purplish red, dextral, and glabrous. Most of them grow in shady mountainous areas, so they can be used as medicine and taste good.

Hemp yam contains relatively low calories, and its sugar content is not the same as that of ordinary sugar which is easy to make people fat. Therefore, although its nutritional value is high, it is not easy to cause obesity. In addition, it is precisely because of its low calorie and no sucrose that it has become an ideal food for diabetics. Yam is a kind of bodybuilding food. People who want to lose weight can take yam as the staple food, which can not only avoid the damage to human function caused by dieting, but also help to achieve the purpose of losing weight.