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

Astragalus eucosmus B.L. Rob.
elegant milk-vetch (elegant milkvetch)
Fabaceae (Pea family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #30060)

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Distribution of Astragalus eucosmus
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Species Information

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General:
Perennial herb from a taproot and branching stem-base; stems solitary to few, ascending to erect, 15-70 cm tall, unbranched, with short, stiff, appressed, unbranched hairs.
Leaves:
Alternate, pinnately compound, 3-11 cm long on very short or no stalks; leaflets 9 to 19, thin, greenish, hairless above, hairy below, elliptic to lance-oblong, blunt or notched at the tip, 1-2.5 cm long; stipules lanceolate, 4-9 mm long, a few lowermost fused and clasping at the base, free above.
Flowers:
Inflorescence an axillary raceme of 10 to 30 pea-like flowers, the racemes compact and 2-3 cm long initially, elongating in age to 20 cm, on stalks 8-18 cm long and about twice the length of the leaves, the flowers nodding and becoming oriented to one side; corollas purplish, occasionally white, 6-9 mm long, the wings shorter than the banner, slightly longer than the keel; calyces bell-shaped, 2.5-4 mm long, black- or grey-hairy, the teeth linear-lanceolate and 1/2 as long as the tube.
Fruits:
Pods, obliquely egg-shaped to ellipsoid, rigid-pointed at the tip, somewhat flattened, drooping, densely grey-black-hairy, 8-12 mm long, straight, nearly unstalked, membranous-papery, 1-chambered but with a partial partition.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to mesic meadows, streambanks, gravel bars, rocky slopes, thickets and open forests in the montane and lower subalpine zones; infrequent in BC east of the Coast-Cascade Mountains; N to AK, YT and NT, E to NF and S to MT and CO.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Astragalus eucosmus

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) 350 1463 2408
Slope Gradient (%) 0 19 70
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
20 154 320
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 3 6
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
16
Modal BEC Zone Class
ESSF
All BEC Zones (# of stations/zone) species was recorded in: BWBS(3), ESSF(6), IDF(3), IMA(1), SBPS(1), 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.

Synonyms and Alternate Names

Astragalus eucosmus subsp. sealei (Lepage) Hult╬śn
Astragalus eucosmus var. facinorum Fernald
Astragalus parviflorus (Pursh) MacM.
Astragalus sealei Lepage
Atelophragma elegans (Hook.) Rydb.
Microphacos parviflorus (Pursh) Rydb.

Taxonomic and Nomenclatural Links

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General References