Cyathula officinalis (English common names: Cyathula root, Radix Cyathula, ox knee, Chinese: chuan niu xi[1]), is a species of Cyathula native to the China (Guizhou, Hebei, Shanxi, Sichuan, Yunnan, Zhejiang) and Nepal.

Its IPNI number is 60176-1[permanent dead link‍].

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