Page authors: Don Knoke, David Giblin
Thalictrum occidentale
western meadow-rue

Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to northern California, east to Montana and Colorado.

Habitat: Shady woodlands and forests, from low elevations to mid-elevations in the mountains.

Flowers: May-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Dioecious, glabrous to glandular-puberulent perennial, the stems 4-10 dm. tall.


Leaves mostly cauline, 3-4 times ternate, the leaflets obovate, 1.5-3 cm. long, rounded at the base, 3-lobed, the lobes entire or shallowly 2- or 3-toothed.


Inflorescence an open, leafy-bracteate panicle; sepals 4-5, 2-3 mm. long, greenish-white to purplish; petals none; stamens 15-30, the filaments filiform, 4-8 mm. long, purplish; ovaries glandular-puberulent; stigmas purplish, 3-4.5 mm. long; ovary superior.


Achenes 4-9, spreading, 5-8 mm. long, with 3 prominent nerves on each side.

Accepted Name:
Thalictrum occidentale A. Gray
Publication: Proc. Amer. Acad. Arts. 8: 372. 1873.

Synonyms & Misapplications:
Thalictrum occidentale A. Gray var. macounii B. Boivin
Thalictrum occidentale A. Gray var. occidentale [KZ99]
Thalictrum occidentale A. Gray var. palousense H. St. John
Additional Resources:

PNW Herbaria: Specimen records of Thalictrum occidentale in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Thalictrum occidentale checklist entry.

OregonFlora: Thalictrum occidentale information.

E-Flora BC: Thalictrum occidentale atlas page.

CalPhotos: Thalictrum occidentale photos.

USDA Plants: Thalictrum occidentale information.

98 photographs:
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