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

Astragalus robbinsii (Oakes) A. Gray
Robbins' milk-vetch
Fabaceae (Pea family)

Introduction to Vascular Plants

© Paul Handford  Email the photographer   (Photo ID #72754)

E-Flora BC Static Map
Distribution of Astragalus robbinsii
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 robbinsii var. minor

Species Information

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



General:
Perennial herb from a taproot and branching stem-base; stems usually ascending to erect but decumbent-based, sometimes prostrate on harsh sites, 20-70 cm tall/long, with short, stiff, appressed, unbranched hairs or nearly glabrous.
Leaves:
Alternate, pinnately compound, 5-12 cm long; leaflets 7 to 19, narrowly egg-shaped to oblong, rounded or notched at the tip, 1-3 cm long, glabrous above, paler and short-hairy on the lower surface; stipules egg-shaped, 4-7 mm long, the lower ones joined and clasping the stem.
Flowers:
Inflorescence a loose, axillary raceme of 6 to 25 or more pea-like flowers mostly on one side of the axis, the raceme-stalks 9-23 cm long, longer than the leaves; corollas whitish or yellowish to pale purple, fading bluish, 6-11 mm long, the banner much longer than the wings, which are longer than the keel; calyces bell-shaped, 4-7 mm long, short-black-hairy, the lance-linear teeth 1/4-1/2 the length of the tube.
Fruits:
Pods, narrowly ellipsoid, spreading to drooping, short-stalked, membranous, black-hairy, 1.5-2.5 cm long, compressed, 1-chambered but with a thin partial partition.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to mesic meadows, streambanks, gravel bars, rocky slopes and forest openings in the steppe and montane zones, rarely to the alpine zone; frequent in BC S of 52degreeN and east of the Coast-Cascade Mountains; N to AK, YT and NT, E to SW AB and S to CO, NV and N WA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Astragalus robbinsii

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) 1000 1950 2682
Slope Gradient (%) 0 38 95
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
20 227 355
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:
26
Modal BEC Zone Class
ESSF
All BEC Zones (# of stations/zone) species was recorded in: BG(1), BWBS(1), ESSF(12), ICH(1), IDF(2), IMA(5), MS(2), SWB(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

Related Databases

General References