Coptis

Coptis (goldthread or canker root) is a genus of between 10–15 species of flowering plants in the family Ranunculaceae, native to Asia and North America.

Species
Selected species
Coptis aspleniifolia – fernleaf goldthread, spleenwort-leaf goldthread
Coptis chinensis – Chinese goldthread, Huang lian in Chinese (Chinese: 黃連; pinyin: huánglián)
Coptis deltoidea
Coptis trifolia (syn. Coptis trifolia)
Coptis japonica – Japanese goldthread, Riben huang lian in Chinese (Chinese: 日本黃連; pinyin: Rìběn huánglián)
Coptis laciniata – Oregon goldthread: California, Oregon, Washington State
Coptis occidentalis – Idaho goldthread: Idaho, Montana, Washington
Coptis omeiensis
Coptis quinquefolia