Page authors: Don Knoke, David Giblin
Hedysarum sulphurescens
yellow sweet-vetch

Distribution: Occurring east of the Cascades crest in north-central and northeastern Washington; British Columbia to Washington, east to Alberta, Montana, and Wyoming, also reported from northeastern Oregon.

Habitat: Open forested areas.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Review Group 1 in Washington (WANHP)


Herbaceous perennial with several stems from a thick crown, 3-6 dm. tall, branched above, greenish, sparsely pubescent.


Leaves alternate, odd-pinnate, the leaflets ovate-lanceolate; stipules membranous, brownish, 10-15 mm. long.


Inflorescence of bracteate racemes on long peduncles arising from the leaf axils; calyx bell-shaped, 43-4 mm. long, with 2 awl-shaped bracteoles at the base, the 5 teeth shorter than the tube, the upper 2 broader and shorter than the lower 3; flowers 20-100, pale yellow to nearly white, pendant, 14-18 mm. long; corolla pea-like, wings with slender lobes joined by their tips over the ovary; stamens 10.


Pod with 1-4 obovate segments, 6-10 mm. broad, the margins narrowly winged.

Accepted Name:
Hedysarum sulphurescens Rydb.
Publication: Bull. Torrey Bot. Club 24(5): 251. 1897. 1897.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Hedysarum sulphurescens in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Hedysarum sulphurescens checklist entry.

E-Flora BC: Hedysarum sulphurescens atlas page.

CalPhotos: Hedysarum sulphurescens photos.

USDA Plants: Hedysarum sulphurescens information.

9 photographs:
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