Page authors: Don Knoke, David Giblin
Thermopsis montana
mountain buck-bean, mountain golden-banner, mountain golden-pea, mountain thermopsis

Distribution: Occurring on both sides of the Cascades crest in Washington, but only occurring in the far western and eastern counties; British Columbia to California, east to the Rocky Mountains.

Habitat: Sandy, well-drained soil to wet meadowland, low to moderate elevations.

Flowers: May-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bumblebees, bees


Herbaceous perennial from thick, woody rhizomes, the stem 5-10 dm. tall, more or less hollow, densely pubescent, or glabrous below.


Leaves trifoliate, leaflets linear-elliptic to oblanceolate, up to 10 cm. long; stipules linear-lanceolate, leaf-like.


Inflorescence of sub-terminal, bracteate, axillary racemes, erect, 10- to 60-flowered, 1-3 dm. long; flowers pea-like, yellow, erect, 20-25 mm. long; calyx bell-shaped, bilabiate, the lips toothed; stamens 10, distinct.


Pods erect to spreading, straight, villous, leathery.

Accepted Name:
Thermopsis montana Nutt.
Publication: Fl. N. Amer. (Torr. & A. Gray) 1(3): 388. 1840.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Thermopsis montana in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Thermopsis montana checklist entry

OregonFlora: Thermopsis montana information

E-Flora BC: Thermopsis montana atlas page

CalPhotos: Thermopsis montana photos

40 photographs:
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