Page author: David Giblin
Epilobium glaberrimum
smooth willowherb

Distribution: Widely distributed throughtout much of the mountainous areas of Washington; British Ciolumbia south to California, east to Montana, Idaho and Colorado.

Habitat: Wet places at mid-elevations in the mountains.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Glabrous, glaucous perennial from branching rhizomes, the stems many, simple or basally branched, erect, 1-5 dm. tall.


Leaves opposite, numerous and overlapping, sessile and slightly clasping, oblong-lanceolate to ovate, obtuse, entire to denticulate, 1.5-4.5 cm. long, gradually reduced upward.


Inflorescence of terminal, bracteate racemes; pedicels 5-20 mm. long; calyx tube 1.5 mm. long, the 4 lobes 2-4 mm. long, rose to purplish-tinged; petals 4, 4-8 mm. long, notched, light pink to deep rosy-purple; stamens 8; stigma entire; ovary inferior, 4-celled.


Capsule 4-7 cm. long, linear, curved, glabrous; seeds with a tuft of white hairs at the tip.

Accepted Name:
Epilobium glaberrimum Barbey

Synonyms & Misapplications:
Epilobium glaberrimum Barbey ssp. fastigiatum (Nutt.) Hoch & P.H. Raven [JPM2]
Epilobium glaberrimum Barbey ssp. glaberrimum [JPM2]
Epilobium glaberrimum Barbey var. fastigatum (Nutt.) Trel., orthographic variant [HC]
Epilobium glaberrimum Barbey var. fastigiatum (Nutt.) Trel.
Epilobium glaberrimum Barbey var. glaberrimum [HC]
Additional Resources:

PNW Herbaria: Specimen records of Epilobium glaberrimum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Epilobium glaberrimum checklist entry.

E-Flora BC: Epilobium glaberrimum atlas page.

CalPhotos: Epilobium glaberrimum photos.

USDA Plants: Epilobium glaberrimum information.

34 photographs:
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