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

Astragalus beckwithii Torr. & A. Gray
Weiser milk-vetch (Beckwith's milkvetch)
Fabaceae (Pea family)

Introduction to Vascular Plants

© Reg Newman  Email the photographer   (Photo ID #12163)

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Distribution of Astragalus beckwithii
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SUBTAXA PRESENT IN BC
Astragalus beckwithii var. weiserensis

Species Information

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General:
Fleshy perennial herb from a taproot and short-forking stem-base; stems several, tufted to mat-forming, decumbent to ascending, 20-40 cm long/tall, few-branched, glabrous.
Leaves:
Alternate, pinnately compound, 5-15 cm long, stalked; leaflets 11 to 25, elliptic to egg-shaped, rounded or notched at the tip, glabrous or the margins with a few appressed, unbranched hairs, 10-20 mm long; stipules narrowly egg-shaped, 2-7 mm long, not joined.
Flowers:
Inflorescence a loose, axillary raceme of 5-15 spreading, pea-like flowers, the racemes 1-6 cm long, their stalks 3-14 cm long and shorter than the leaves; corollas creamy-white to yellow, 1.5-2 cm long, the banner and wings about equal in length and longer than the rounded keel; calyces glabrous or sparsely blackish-hairy, 7-14 mm long, the awl-shaped teeth equal to the bell-shaped tube.
Fruits:
Pods, ellipsoid, curved, 1.5-3 cm long, erect on stout stalks 1-5 mm long, somewhat inflated, glabrous, sometimes purplish-mottled, rather fleshy becoming leathery, 1-chambered.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry grassy slopes, bluffs, river terraces and sagebrush flats in the steppe zone; locally frequent in SC BC; S to ID, UT, NV and NC WA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Astragalus beckwithii

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) 348 695 1050
Slope Gradient (%) 0 27 65
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
2 181 278
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 5
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
22
Modal BEC Zone Class
BG
All BEC Zones (# of stations/zone) species was recorded in: BG(13), IDF(3), PP(6)

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