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

Astragalus collinus Douglas ex G. Don
Rattle milk-vetch (hillside milk-vetch)
Fabaceae (Pea family)

Introduction to Vascular Plants

© Doug Skilton  Email the photographer   (Photo ID #6733)

E-Flora BC Static Map
Distribution of Astragalus collinus
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 collinus var. collinus

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 several, clumped, spreading to erect, 10-50 cm tall, often branched, leafless on lower part, with fine, soft, curly, unbranched hairs.
Leaves:
Alternate, pinnately compound, 3-9 cm long, short-stalked; leaflets 11 to 21, oblanceolate to oblong, often notched at the tip, 8-20 mm long; stipules lanceolate, 2-5 mm long, not joined.
Flowers:
Inflorescence an axillary raceme of 15 to 40 nodding, pea-like flowers, the racemes compact at first then elongating, 4-12 cm long on stalks that are longer than the leaves; corollas creamy-white to yellowish with greenish tinges, 13-17 mm long, the stubby banner shorter than the wings, which barely exceed the blunt keel; calyces 7-10 mm long, downy with white and black hairs, the tube bulging on one side at the base, the lance-triangular teeth 1-3 mm long.
Fruits:
Pods, lance-oblong, drooping on stalks 5-15 mm long, straight or gently curved, 7-25 mm long, laterally flattened, with short, soft or appressed hairs, somewhat fleshy becoming leathery and net-veined, 1-chambered.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry grasslands, sagebrush flats and rocky slopes in the steppe and lower montane zones; locally common in SC BC; S to ID and NE OR.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Astragalus collinus

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) 387 717 1310
Slope Gradient (%) 0 24 80
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
1 173 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 3 5
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
60
Modal BEC Zone Class
BG
All BEC Zones (# of stations/zone) species was recorded in: BG(37), ICH(2), IDF(9), MS(1), PP(11)

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