Coptis chinensis

Coptis chinensis, the Chinese goldthread, is a species of goldthread flowering plant native to China.
Chemical constituents.
The rhizomes of "Coptis chinensis" contain the isoquinoline alkaloids berberine, palmatine, and coptisine among others.
Traditional uses.
"Coptis chinensis" is one of the 50 fundamental herbs used in traditional Chinese medicine, where it is called "duǎn è huánglián" ().
Other uses.
Because of the strong coloring quality of berberine, it has been traditionally used as a dye, especially for wool and other fibers.