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Montana Field Guide

Montana Field Guides

Silver-leaved Milkvetch - Astragalus argophyllus

Status Under Review

Global Rank: G5
State Rank: S3?

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 6

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General Description
Nearly acaulescent, often mat-forming perennial from a branched, woody caudex. Herbage densely silvery-strigose. Leaves with 7 to 21 narrowly oblong to elliptic leaflets, 5–15 mm long. Inflorescence of 2–8 ascending flowers on a peduncle 1–5 cm long. Flowers purple; sepals 2–4 mm long; calyx black- and white-hairy; banner slightly reflexed, 15–24 mm long; keel 12–20 mm long. Legume ascending, narrowly ovoid with a flattened beak, silvery pilose, 15–20 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are variety argophyllus.

Species Range
Present
 


Range Comments
ID, MT south to NV, AZ, UT and WY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 31

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Sparsely vegetated soil of moist, alkaline meadows, streambanks; montane, lower subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Silver-leaved Milkvetch — Astragalus argophyllus.  Montana Field Guide.  .  Retrieved on , from