Coptis

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

==Species== {| class="wikitable" |- ! Image !! Scientific name !! Common name !! Distribution |- |120px ||Coptis aspleniifolia ||fernleaf goldthread, spleenwort-leaf goldthread|| British Columbia, in Alaska, and along the Cascades into Washington |- | ||Coptis chinensis ||Chinese goldthread ||China. |- | ||Coptis deltoidea || ||China (W. Sichuan) |- | ||Coptis huanjiangensis || || China (Guangxi) |- |120px ||Coptis japonica ||Japanese goldthread ||Japan |- | ||Coptis kitayamensis || ||Japan (Honshu) |- |120px ||Coptis laciniata || Oregon goldthread||California, Oregon, Washington State |- |120px||Coptis lutescens || ||Japan (C. Honshu) |- | ||Coptis minamitaniana || ||Japan (Kyushu) |- |120px ||Coptis occidentalis || Idaho goldthread ||Idaho, Montana, Washington |- | ||Coptis omeiensis || ||China (W. Sichuan, Henan) |- |120px ||Coptis quinquefolia || ||Taiwan, Japan |- | ||Coptis quinquesecta || ||Yunnan, China and northern Vietnam. |- |120px ||Coptis ramosa || ||Japan |- | ||Coptis teeta ||Yunnan goldthread||Arunachal Pradesh to China (NW. Yunnan) |- |120px||Coptis trifolia ||threeleaf goldthread, savoyane, canker-root||Eastern Eurasia, Greenland, Saint Pierre and Miquelon, Canada, USA |- |120px ||Coptis trifoliolata || ||Japan (N. & Central Honshu) |- |}