Xu Changqing is a perennial herb of the genus Baiqian of the oleander family, mainly produced in southern and northeastern China. Xu Changqing can be used both internally and externally. It is mainly produced in Zhejiang, Jiangsu, Hunan, Hubei and other places. Xu Changqing mainly contains paeonol, isopoiol, Xuchangqing glycosides A, B, C and a small amount of alkaloids.

Self knowledge introductionTetrafluorrhizae is the root tuber of tetrafluorrhizae. This is a deciduous perennial vine that grows on hillsides, grass and shrubs in the wilderness. Distributed in Anhui, Zhejiang, Jiangxi, Fujian, Taiwan, Hubei, Hunan, Guangdong, Guangxi and other places.Autumn dig.