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

Astragalus vexilliflexus Sheldon
bent-flowered milk-vetch (bentflower milkvetch)
Fabaceae (Pea family)

Introduction to Vascular Plants

© Ryan Batten  Email the photographer   (Photo ID #52840)

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Distribution of Astragalus vexilliflexus
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Astragalus vexilliflexus var. vexilliflexus

Species Information

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Perennial herb from a woody taproot and branching stem-base; stems several, slender, tufted, branched, prostrate to ascending, often mat-forming, 10-30 cm long, with short, stiff, appressed, unbranched hairs.
Alternate, pinnately compound, 1.5-3 cm long; leaflets 7 to 13, narrowly elliptic to oblanceolate, pointy-tipped, 5-12 mm long, densely short-appressed-hairy, at least on the lower surface; stipules lanceolate, 2-4 mm long, fused half their length.
Inflorescence a loose, axillary raceme of 3 to 10 spreading, pea-like flowers, the racemes on stalks equalling or shorter than the leaves; corollas yellowish-white to purplish, 5-8 mm long, the banner much longer than the wings and keel; calyces about 1/2 as long as the corollas, the linear-lanceolate teeth about 2/3 as long as the tube.
Pods, oblong-elliptic, nodding, unstalked, 6-11 mm long, membranous, flattened, short-appressed-hairy, 1-chambered.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry scree slopes, gravelly banks and grassy knolls in the subalpine and alpine zones; rare in SE BC, known only from McLatchie Creek, Flathead Pass and Mt. Gass, Fording River valley; E to SK, S to WY and C ID.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Astragalus vexilliflexus

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 1770 2272 2661
Slope Gradient (%) 30 56 81
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
79 195 300
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 1 3
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: BAFA(1), ESSF(16), IMA(6)


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.

Taxonomic and Nomenclatural Links

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General References