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)

E-Flora BC Static Map
Distribution of Astragalus beckwithii
Click here to view the full interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

SUBTAXA PRESENT IN BC
Astragalus beckwithii var. weiserensis

Species Information

Click on the image below to view an expanded illustration for this species.



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

Related Databases

General References