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Montana Field Guide

Montana Field Guides

Rattle Milkvetch - Astragalus adsurgens


Global Rank: G5
State Rank: S4S5

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

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General Description
Caespitose perennial. Herbage sparsely to densely strigose with dolabriform hairs. Stems 15–40 cm from a branched caudex. Leaves with 9 to 21 narrowly elliptic leaflets, 1–2 cm long; stipules lanceolate, united around the stem at the base. Inflorescence spike-like with 15 to 80 erect to ascending flowers. Flowers purple; sepals 1–4 mm long; calyx white and black dolabriform-hairy; banner barely reflexed, 11–16 mm long; keel 8–13 mm long. Legume sessile, erect, 6–12 mm long, linear-ovoid with appressed, basifixed, white hairs, grooved on 1 side.

Montana plants are variety robustior Hook. (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
Circumboreal, south to WA, NM and NE (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 124

(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
Often stony soil of grasslands, steppe, open forest; plains, valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Rattle Milkvetch — Astragalus adsurgens.  Montana Field Guide.  .  Retrieved on , from