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

Astragalus filipes Torr. ex A. Gray
threadstalk milk-vetch (basalt milkvetch)
Fabaceae (Pea family)

Introduction to Vascular Plants

© Virginia Skilton  Email the photographer   (Photo ID #16025)

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Distribution of Astragalus filipes
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Species Information

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General:
Perennial herb from a thick, woody taproot and branching stem-base; stems several to numerous, slender, erect, 30-70 cm tall, often branched, with short, appressed, unbranched hairs.
Leaves:
Alternate, pinnately compound, 5-10 cm long, short-stalked; leaflets 9 to 21, narrowly oblong-elliptic, 5-20 mm long, glabrous or grey-hairy above; stipules triangular, 1-3 mm long, the lower ones fused into a papery sheath, the upper free.
Flowers:
Inflorescence a loose, axillary raceme of 10 to 30 spreading to nodding, pea-like flowers, the racemes somewhat 1-sided, elongating in fruit to about equal the 6- to 20-cm long stalk, the stalks exceeding the leaves; corollas cream-coloured, 9-13 mm long, the wings shorter than the banner but longer than the keel; calyces blackish- or partly white-hairy, 4-6 mm long, the triangular teeth 1 mm long.
Fruits:
Pods, narrowly oblong-elliptic, drooping from slender stalks 10-15 mm long, membranous, greenish, 15-35 mm long, strongly flattened, 1-chambered.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
White
Blooming Period:
Late Spring
Fruit/Seed characteristics:
Colour: Black
Present over the Summer
Source:  The USDA

Habitat / Range

Dry sagebrush flats and grassy slopes in the steppe and lower montane zones; rare in SC and SE BC; S to WA, NC OR and MX.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Astragalus filipes

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) 480 801 1097
Slope Gradient (%) 2 27 72
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
40 167 320
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 3 4
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
25
Modal BEC Zone Class
BG
All BEC Zones (# of stations/zone) species was recorded in: BG(11), IDF(2), PP(9)

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.

Synonyms and Alternate Names

Astragalus filipes var. residuus Jeps.
Astragalus macgregorii (Rydb.) Tidestr.
Astragalus stenophyllus Torr. & A. Gray
Astragalus stenophyllus var. filipes (Torr. ex A. Gray) Tidestr.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References