Page author: David Giblin
Epilobium torreyi
brook willowherb

Distribution: East of the Cascades in Washington from Kittitas County south; both sides of the Cascades in Oregon, south to central California, east to Idaho and Nevada.

Habitat: Places that are soggy with standing water in winter and spring, drying in summer.

Flowers: June-July

Origin: Native

Growth Duration: Annual

Conservation Status: Not of concern


Annual, the stem 1-5 dm. tall, usually branched from the base, spreading only slightly, grayish with dense, soft, straight hairs.


Leaves alternate, numerous, evenly spaced, linear or narrowly lanceolate, entire or remotely denticulate, 1-4 cm. long and 1-2.5 mm. broad.


Flowers axillary and sessile, the floral bracts similar to the leaves but smaller and entire; calyx tubular, 4-lobed; petals 4, borne on the calyx, pink or purplish, about 2 mm. long; ovary inferior, 4-celled; stamens 8, of two lengths.


Capsule 4-celled, 6-11 mm. long, curved, short-beaked.

Accepted Name:
Epilobium torreyi (S. Watson) Hoch & P.H. Raven
Publication: Phytologia 73(6): 458 [1993]. 1992.

Synonyms & Misapplications:
Boisduvalia stricta (A. Gray) Greene [HC]
Additional Resources:

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

WA Flora Checklist: Epilobium torreyi checklist entry.

E-Flora BC: Epilobium torreyi atlas page.

CalPhotos: Epilobium torreyi photos.

USDA Plants: Epilobium torreyi information.

23 photographs:
Group by