Origin Coptis chinensis is mainly produced in Shizhu County, Sichuan Province and lichuan county, Hubei Province. It is an authentic medicinal material in two provinces and is known as the "hometown of Coptis chinensis". Products, commonly known as William and Ji Zhaolian, sell well at home and abroad. Coptis triangularis is mainly produced in Emei and Hongya counties of Sichuan Province, and it is also an authentic medicinal material produced in Sichuan Province. Known as the "hometown of Allen", with the trade name of Allen, it is the best product of Coptis Triangle and enjoys a good reputation at home and abroad. Coptis yunnanensis is mainly produced in Diqing Tibetan Autonomous Prefecture, Yunnan Province, and its trade name is Lianyun. Because of its small output, its commodities are mainly exported.