There are two species cultivated in China: 1) Home yam (ordinary yam) Our country of origin. The stems are characterized by their round and non-winged wings, and they are cultivated in the middle and the north. There are three variants according to their tuber shape: (l) Flat lumps, similar in shape to the soles of the feet, suitable for cultivation in shallow soils and in wet and heavy soils, such as stilettos in Jiangxi, yam in Guangzhou, and feet in Chongqing, Sichuan. (2) Cylindrical species, tubers and short round rods form irregular lumps, which are mainly cultivated in the south, such as Zhejiang Huangyan potato medicine and Taiwan potato. (3) Long column species, tubers 30-100 cm long, mainly in North China, such as Shaanxi Huazhou yam medicine, Henan slow yam. 2) Tianshu (big potato) The stems are characterized by their polygonal stems and their wings, which are mainly distributed in Guangdong, Guangxi, Fujian and Taiwan, and are divided into three varieties according to the whole shape: (1) Long tuber species (long column species) tubers are as long as 33-66 cm, with strong cold resistance, requiring deep upper layers, such as Fujian potato and potato. Guangzhou Hejian potato and Lidong potato. Real yam from Ruichang in Jiangxi, Guangxi from big potato in Chengdu, oxtail from Chengdu, yam from Jiangsu line, yam from yam. (2) Flat-shaped species (flat-sliced ​​species) Tubers are flat and wrinkled, 2-3 lobes of bifurcation, weak cold resistance, and shallow soil layers can also be cultivated. Shaped palm-shaped, called "bud palm potato" or "foot potato." Such as Zhejiang Ruian sweet potato, Jiangxi Nancheng and Sichuan Chengdu foot plate (white peony), Guangdong kwai potato and yam potato, ginkgo leaf shaped like Fujian ginkgo biloba. (3) Tuber (tubular species) Tubers often become short cylindrical or irregular lumps, such as Zhejiang Huangyan peony, Fujian Guanyin potato, Guangdong early sweet potato and sweet potato, and Taiwan white potato. Best Eyelash Curler,Eyelash Curler Price,Good Eyelash Curler,Cheap Eyelash Curler Shenzhen Jie Zhong Lian Investment Co., Ltd. , https://www.meizons.com