Ephedra (grass ephedra): grass ephedra is mainly distributed in China's northwest, north China and Liaoning, Jilin and other regions, now scarce resources. Mainly produced in Ningxia, Gansu, Inner Mongolia and other provinces (autonomous regions). The whole herb is used as medicine. The above-ground part has the effects of sweating, asthma, diuretic, and is the raw material for extracting ephedrine. The roots have antiperspirant effects. Pharmacopoeia into the ephedra of ephedra grass ephedra, ephedra in ephedra, woodchuck ephedra.