Sweet potato is not only a good edible vegetable, but also a medicinal material. It is eaten or used as medicine by its fleshy underground tubers. Its tuber is rich in starch, protein, vitamins, amino acids and various medicinal components (such as choline, saponin, mucopolysaccharide, etc. ), but also contains iron, zinc, copper, calcium and other minerals. It can strengthen the spleen and stomach, lower blood pressure and blood sugar, resist tumor and delay aging.

Sweet potato is a plant of Dioscorea in Dioscoreaceae. Twisted grass vines. Tubers are long cylindrical and grow vertically. When dry, the skin is brown and does not fall off, and the cross section is white. Stems glabrous, right hand, base spiny. Simple leaves, alternate at the lower part of the stem, opposite above the middle part; Leaves are paper. Dioecious. The male inflorescence is a spike with a length of1.5-3cm, and 2-4 clustered or solitary inflorescences are arranged in panicles on the inflorescence axis. Capsule is not reflexed, triangular and oblate; The seeds are inserted in the middle of the central axis of each locule and surrounded by membranous wings. The flowering period is from 10 to the following year 1, and the fruiting period is from 12 to 1. ?

Distributed in China, southern Zhejiang, Fujian, Guangdong, Guangxi and southern Hunan. It grows in hillsides, gullies, gullies or roadside miscellaneous forests at an altitude of 50-1150m.