Chinese name: Asarum, alias: Maowujin, Wuhua, Asarum, Asari, Asari and Baisanbaibang. It is the whole grass, root and rhizome of Asarum of Aristolochiaceae. The rhizome can be as long as 50 cm, rising obliquely or horizontally, and the aboveground stem is 3-7 cm long. Dig the whole grass in summer, remove the soil, and dry in the shade in a ventilated place. Born on wet slopes under forests in mountainous areas. Distributed in Jiangsu, Anhui, Hubei, Sichuan, Guizhou and Yunnan.