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

Astragalus sclerocarpus A. Gray
The Dalles milk-vetch (woodypod milkvetch)
Fabaceae (Pea family)

Introduction to Vascular Plants

© Ryan Batten  Email the photographer   (Photo ID #23768)

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Distribution of Astragalus sclerocarpus
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Species Information

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General:
Perennial herb from a long, woody taproot and short-branching stem-base; stems decumbent to ascending, 20-50 cm long/tall, several, branched, leafless at the base, sparsely to densely appressed-hairy.
Leaves:
Alternate, pinnately compound, 5-13 cm long, short-stalked; leaflets (7) 15 to 21, linear to oblong, 15-25 mm long, short-appressed-hairy beneath, nearly glabrous above; stipules triangular, rusty, 2-4 mm long, above-ground ones not joined, subterranean ones mostly with bases running down the stem, but sometimes joined.
Flowers:
Inflorescence an axillary raceme of 7 to 25 spreading-ascending, pea-like flowers, the racemes 3-7 cm long, their stalks to 9 cm long, from shorter than to as long as the leaves; corollas white to greenish-white with purplish tips, 10-14 mm long, the banner slightly longer than the wings, which are about 1 mm longer than the rounded keel; calyces 5-7 mm long, grey to black appressed-hairy, the triangular teeth 1/2 as long as the tube.
Fruits:
Pods, ellipsoid, 2-3 cm long, drooping on slender stalks 1.5-2 cm long, grey-appressed-hairy to almost glabrous, fleshy and filled with stringy fibres, leathery when dry, curving to a semi-circle and often purplish-mottled at maturity, 1-chambered.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry sandy banks and terraces in the steppe and lower montane zones; rare in SC BC; S to WA and NE OR.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Astragalus sclerocarpus

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

Minimum

Average

Maximum

Elevation (metres) 340 350 360
Slope Gradient (%) 12 36 60
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
138 158 180
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 2
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
2
Modal BEC Zone Class
BG
All BEC Zones (# of stations/zone) species was recorded in: BG(1), PP(1)

Climate

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

Additional Photo Sources

General References