Page author: David Giblin
Epilobium luteum
yellow willowherb

Distribution: In the Olympics and Cascades in Washington; Alaska south to California.

Habitat: Stream banks and wet areas at mid- to high elevations in the mountains.

Flowers: July-September

Origin: Native

Conservation Status: Not of concern


Herbaceous perennial from widespread rhizomes, the stems simple, erect, 2-7 dm. tall; pubescent in lines down the stems.


Leaves mostly opposite, sub-sessile, ovate-lanceolate to lanceolate, 3-8 cm. long, glandular-serrulate to glandular-dentate, glabrous.


Flowers 2-10, axillary in the reduced upper leaves; pedicels 5-30 mm. long; calyx tube cup-shaped, 1-2 mm. long, the 4 lobes linear-lanceolate, 8-13 mm. long; petals 4, yellow, shallowly obcordate, 14-18 mm. long; stamens 8; style much longer than the petals; stigma lobes 4, oblong-ovate, 2 mm. long; ovary inferior, 4-celled.


Capsule linear, 4-8 cm. long; seeds with a tuft of rust-colored hairs at the tip.

Accepted Name:
Epilobium luteum Pursh
Publication: Fl. Amer. Sept. 1: 259 [1813]. 1814.

Synonyms & Misapplications:
(none provided)
Additional Resources:

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

WA Flora Checklist: Epilobium luteum checklist entry.

E-Flora BC: Epilobium luteum atlas page.

CalPhotos: Epilobium luteum photos.

USDA Plants: Epilobium luteum information.

42 photographs:
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