How to identify Radix Saposhnikoviae Guan, Radix Saposhnikoviae Chuan and Radix Saposhnikoviae Yun?

Location: Heilongjiang, Jilin and other places. The confused products are Ligularia brevifolia and Ligularia yunnanensis produced in Yunnan, Sichuan and Guizhou. The latter two are commonly used in the region. The identification of the three is as follows: 1, Guan Fangfeng: rhizome: thick; Surface: rough, with dense ring lines on the roots and head, grayish brown; Texture: soft; Top: tufted dark brown fibers; Smell: The smell is fragrant and the taste is slightly sweet and astringent. 2. Sichuan Saposhnikovia root: small; Surface: scarred, brown or gray-black; Texture: solid; Top: no fiber; Smell: Slightly fragrant and slightly sweet. 3, cloud windbreak: root shape: slender; Surface: flat, reddish brown or brown; Texture: solid; Top: less dark brown fiber; Smell: fragrant, sour and astringent.