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

Introduction to Vascular Plants

Photograph

© Ryan Batten     (Photo ID #52830)

Map

E-Flora BC Static Map

Distribution of Astragalus bourgovii
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Species Information

General:
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.
Leaves:
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.
Flowers:
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.
Fruits:
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

Illustration

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Ecology

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

Avg

Min

Max
Elevation (metres)
 2237 1485 2682
Slope Gradient (%)
 46 0 100

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

 131 10 353
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric] 		2 0 5
Modal Nutrient Regime
Class
 B
# of field plots
 species was recorded in:
 85
Modal BEC Zone Class
 ESSF

All BEC Zones (# of stations/zone) species was recorded in

 AT(20), ESSF(55), IMA(9)

Habitat and 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

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