Yam is a perennial herbaceous plant

Dioscorea, also known as yam, yam, yam, yam, yam, and yam. Perennial herb, with spreading stems, often purple, cylindrical roots, opposite leaves, oval or elliptical, milky white flowers, dioecious. The roots contain starch and protein and are edible. There are 650 species of monocots in 10 genera, widely distributed in temperate and tropical regions around the world. my country has 1 genus of Dioscorea and about 80 species. It is native to Pingyao and Jiexiu, Shanxi Province, and is now distributed in Jiangxi provinces and regions in North my country, Northwest China and the Yangtze River Basin.