Atractylodes lancea Rhizome Source & Identity
The botanical entity is Atractylodes lancea (Thunb.) DC., a perennial of the daisy family, Asteraceae, native to China, Korea and Japan. The part used is the dried rhizome. Chinese pharmacopoeial texts also accept a close relative, Atractylodes chinensis, as a source of cangzhu.
The most frequent mix-up is with Atractylodes macrocephala, the white baizhu. The two are different rhizomes with different structure and a different volatile oil profile, and they are sold as separate materials.
Cut cangzhu shows orange-red oil dots, and old stock can develop a white crystalline bloom. The volatile oil, rich in sesquiterpene alcohols, defines the herb.












