Distribution: Occurring west of the Cascades crest in Washington in the northwest corner of the Olympic Peninsula. Alaska to Washington, Idaho and Montana, east across northern North America to the Atlantic; disjunct in Clackamas County, Oregon; also in Greenland and eastern Eurasia.
Habitat: Deep woodland, often where swampy.
Flowers: May-August
Origin: Native
Growth Duration: Perennial
Conservation Status: Threatened in Washington (WANHP)
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PNW Herbaria: Specimen records of Coptis trifolia in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Coptis trifolia checklist entry.
OregonFlora: Coptis trifolia information.
E-Flora BC: Coptis trifolia atlas page.
CalPhotos: Coptis trifolia photos.
USDA Plants: Coptis trifolia information.