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Montana Field Guide

Montana Field Guides

Platte River Milkvetch - Astragalus plattensis

Native Species

Global Rank: G5
State Rank: S3S4

Agency Status
MNPS Threat Rank:

External Links

General Description
Perennial from widely branched caudex. Herbage villous. Stems prostrate to ascending, 10–20 cm. Leaves with 13 to 25 oblong to narrowly elliptic leaflets, 4–15 mm long with rounded tips; stipules lanceolate, 3–8 mm long, the lower connate. Inflorescence shorter than the leaves, crowded, of 6 to 12 spreading to ascending flowers. Flowers purple; calyx white-strigose; sepals 2–4 mm long; banner 15–20 mm long, moderately reflexed; keel 10–15 mm long. Legume spreading, ovoid, villous, fleshy, becoming hard, leathery, 15–20 mm long including the filiform beak 3–6 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
MT, ND south to TX (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 7

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



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


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Citation for data on this website:
Platte River Milkvetch — Astragalus plattensis.  Montana Field Guide.  .  Retrieved on , from