Coptis
goldthread
4 species
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Coptis aspleniifoliafern-leaf goldthread
Distribution: Occurring west of the Cascades crest in Washington; Alaska south along the coast to Washington.
Habitat: Moist woods and bogs at low elevations.
Origin: Native
Flowers: April-May
Coptis laciniataOregon goldthread
Distribution: Occurring in the southwestern region of Washington; Washington south to California.
Habitat: Moist woods at low elevations.
Origin: Native
Flowers: April-August
Coptis occidentalisIdaho goldthread, western goldthread
Distribution: Occurring in the northeastern corner of Washington; Adjacent British Columbia east to Idaho and Montana.
Habitat: Moist woods.
Origin: Native
Flowers: April-May
Coptis trifoliathreeleaf goldthread
Distribution: Known from extreme northeastern region of Washington; Alaska to Washington, Idaho and Montana, east across northern North America to the Atlantic; also in Greenland and eastern Eurasia.
Habitat: Deep woodland, often where swampy.
Origin: Native
Flowers: May-August