E-Flora BC: Electronic Atlas of the Flora of British Columbia

Epilobium oregonense Hausskn.
Oregon willowherb
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants
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Distribution of Epilobium oregonense
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Species Information

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Perennial herb, often matted, stolons thread-like, sprawling, with minute, rounded leaves; stems erect, to 40 cm tall, delicate, nearly glabrous, not hairy in lines, purplish above.
Mostly on lower part of stem, round below to linear above, 5-25 mm long, tips blunt to round, clasping at base; unstalked.
Inflorescence very open, sparsely glandular; hypanthium 0.8-1.5 mm long; petals 2-8 mm long, white to rose-purple, notched at tip; sepals 1-4 mm long; stigmas sometimes cylindric.
Capsules, 2-5 cm long; stalks 2-6.5 cm long; seeds 1-1.4 mm long, pimply.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist slopes, boggy areas and open forests in the montane zone; rare in BC, known only from Wells Gray Park and Mt. Arrowsmith; S to ID, WY and CA.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Epilobium alpinum var. gracillimum (Trel.) C.L. Hitchc.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References