Page authors: Don Knoke, David Giblin
Astragalus tweedyi
Tweedy's milk-vetch

Distribution: Occurring east of the Cascades crest in Washington, from Yakima County south; central Washingtonto north-central Oregon near the Columbia River and lower Deschutes River.

Habitat: Sagebrush plains and foothills.

Flowers: May-June

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Grayish-puberulent perennial from a taproot, the several erect stems 2-6 dm. tall.


Leaves alternate, pinnate, 4-10 cm. long; leaflets 13-21, linear to narrowly oblong, 8-22 mm. long and 1-2 mm. wide; stipules lanceolate, 2-5 mm. long.


Inflorescence of closely 10- to 50-flowered racemes, the peduncles up to 15 cm. long, exceeding the leaves; flowers white to pale yellow, spreading or ascending, 15-18 mm. long; calyx 7-9 mm. long, puberulent, slightly gibbous at base, the 5 teeth 1-2 mm. long; wings acute, 1-2 mm. longer than the rounded keel; stamens 10.


Pod erect, glabrous, with a stipe half again as long as the calyx, the body leathery, 15 mm. long and 4-5 mm. wide, terete in cross section, 1-celled, acute at each end.

Accepted Name:
Astragalus tweedyi Canby
Publication: Bot. Gaz. 15: 150. 1890. 1890.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Astragalus tweedyi in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Astragalus tweedyi checklist entry.

E-Flora BC: Astragalus tweedyi atlas page.

CalPhotos: Astragalus tweedyi photos.

USDA Plants: Astragalus tweedyi information.

47 photographs:
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