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Montana Field Guide

Montana Field Guides

Robbins' Milkvetch - Astragalus robbinsii


Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 5

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General Description
Perennial from a loosely branched caudex. Herbage glabrate. Stems ascending to erect, 20–50 cm. Leaves with 7 to 17 lanceolate to oblanceolate leaflets, 10–25 mm long with rounded tips. Inflorescence longer than the leaves, secund with 7 to 12 spreading to declined flowers. Flowers pale purple; calyx black-strigose; sepals 1–2 mm long; banner reflexed, 9–10 mm long; keel 7–9 mm long. Legume pendent, linear-elliptic, triangular in cross section, 13–20 mm long, black- and white-strigose with a stipe 2–5 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are variety robbinsii.

Species Range
Present
 


Range Comments
AK to NL south to WA, ID, CO, and VT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).



Astragalus robbinsii var. jesupii is known only from the shores of the Connecticut River in New Hampshire and Vermont. Three populations are known, two in New Hampshire, one in Vermont, all within a 16 mile stretch of the Connecticut River.


Summary of Observations Submitted for Montana
Number of Observations: 11

(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
Open forest, thickets, meadows, gravel bars, especially along rivers, streams; 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:
Robbins' Milkvetch — Astragalus robbinsii.  Montana Field Guide.  .  Retrieved on , from