Page author: David Giblin
Epilobium ciliatum
ciliate willowherb, Watson's willowherb
WTU specimens
Other herbaria

Distribution: Widely distributed throughout all of Washington; widespread throughout much of North America.

Habitat: Moist soil from lowlands to moderate elevations in the mountains.

Flowers: June-August

Origin: Native

Conservation Status: Not of concern


Perennial from spreading rhizomes that produce rosettes of leaves; stems 3-10 dm. tall, simple below and freely-branched above, puberulent, glandular above.


Leaves opposite, short-petiolate, narrowly lanceolate to ovate-lanceolate, 3-7 cm. long, serrulate.


Inflorescence of racemes terminal on the branches; sepals 4, 2-5 mm. long, purplish; petals 3-10 mm. long, notched, white or cream to deep purplish-red; stamens 8; stigma entire or shallowly 4-lobed; ovary inferior, 4-celled.


Capsule 4-8 cm. long, linear; seeds with a tuft of white hairs on the tip.

Accepted Name:
Epilobium ciliatum Raf.

Synonyms & Misapplications:
Epilobium adenocaulon Hausskn.
Epilobium adenocaulon Hausskn. var. holosericeum (Trel.) Munz
Epilobium adenocaulon Hausskn. var. parishii (Trel.) Munz
Epilobium brevistylum Barbey var. ursinum (Parish ex Trel.) Jeps.
Epilobium ciliatum Raf. ssp. ciliatum [JPM2]
Epilobium ciliatum Raf. ssp. watsonii (Barbey) Hoch & P.H. Raven [JPM2]
Epilobium glandulosum Lehm. var. macounii (Trel.) C.L. Hitchc. [HC]
Epilobium watsonii Barbey [HC]
Epilobium watsonii Barbey var. parishii (Trel.) C.L. Hitchc. [HC]
Epilobium watsonii Barbey var. watsonii [HC]
Additional Resources:

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

WA Flora Checklist: Epilobium ciliatum checklist entry.

E-Flora BC: Epilobium ciliatum atlas page.

CalPhotos: Epilobium ciliatum photos.

USDA Plants: Epilobium ciliatum information.

45 photographs:
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