E-Flora BC: Electronic Atlas of the Flora of British Columbia

Astragalus laxmannii var. robustior Jacq. (Hook.) Barneby & S.L. Welsh
standing milk-vetch (prairie milkvetch)
Fabaceae (Pea family)

Introduction to Vascular Plants

© Virginia Skilton  Email the photographer   (Photo ID #34028)

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Distribution of Astragalus laxmannii var. robustior
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Species Information

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Perennial herb from a taproot surmounted by a superficial root-crown or short-branching stem-base; stems several to many, tufted, decumbent to erect, 10-40 cm.
Alternate, pinnately compound, 4-15 cm long; leaflets 9 to 23, narrowly oblong to elliptic, 1-3 cm long, appressed-hairy; stipules papery, fused
Inflorescence a dense, head-like or spike-like, axillary raceme of 15 to 50 short-stalked, ascending, pea-like flowers, the raceme-stalks 5-15 cm long; corollas white to purplish, 12-18 mm long, the banner 1-3 mm longer than the wings, which are 2-3 mm longer than the keel; cal yces 5-10 mm long, appressed-hairy with mixed black and white hairs, the awl-shaped teeth from 1/3 as long to as long as the tube.
Pods, cylindric to narrowly egg-shap ed, unstalked or on stalks to 1.5 mm long, erect, membranous, 7-12 mm long, densely appressed-hairy, deeply grooved on one side

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry grasslands, grassy bluffs, open gravelly flats, river terraces and rocky slopes in the steppe and montane zones; infrequent in E BC; amphiberingian, N to YT, E to ON and S to MN, NM and WA;

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Astragalus adsurgens Pall.
Astragalus adsurgens subsp. robustior (Hook.) S.L. Welsh
Astragalus adsurgens var. robustior Hook.
Astragalus striatus Nutt.
Astragalus sulphurescens Rydb.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References