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

Astragalus bourgovii A. Gray
Bourgeau's milk-vetch
Fabaceae (Pea family)

Introduction to Vascular Plants

© Ryan Batten  Email the photographer   (Photo ID #52830)

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Distribution of Astragalus bourgovii
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Species Information

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Perennial herb from a stout taproot and branching stem-base; stems several, tufted, from ascending-erect to decumbent, 10-30 cm tall/long, with fine, straight, appressed, unbranched hairs.
Alternate, pinnately compound, 3-8 cm long, short-stalked; leaflets 11 to 23, oblong-elliptic to narrowly egg-shaped, 5-17 mm long, appressed-hairy; stipules 1-3 mm long, joined nearly half their length into a papery sheath.
Inflorescence a loose, axillary raceme of 3 to 13 pea-like flowers, racemes 2-8 cm long on stalks much longer than the leaves; corollas bluish- or pink-purple, 7-11 mm long, the wings considerably longer than the banner and slightly longer than the keel; calyces black appressed-hairy, 4.5-6.5 mm long, the linear-lanceolate teeth 1/2 the length of the tube.
Pods, oblong-elliptic, drooping from stalks shorter than the calyx-teeth, black appressed-hairy, membranous, compressed, not inflated, 12-16 mm long, not grooved below or partitioned, 1-chambered.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic gravel bars, streambanks and rocky slopes, typically on limestone, from the montane to alpine zones; infrequent in extreme SE BC; E to SW AB and S to ID and MT.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Astragalus bourgovii

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) 1485 2237 2682
Slope Gradient (%) 0 46 100
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
10 131 353
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 5
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: AT(20), ESSF(55), IMA(9)


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