Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana; also in eastern North America, where native.
Habitat: Peatlands, marshes, and wet meadows.
Flowers: June-August
Origin: Introduced from eastern North America
Growth Duration: Perennial
Conservation Status: Not of concern
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PNW Herbaria: Specimen records of Epilobium leptophyllum in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Epilobium leptophyllum checklist entry.
OregonFlora: Epilobium leptophyllum information.
E-Flora BC: Epilobium leptophyllum atlas page.
CalPhotos: Epilobium leptophyllum photos.
USDA Plants: Epilobium leptophyllum information.