Bent-flowered Milkvetch - Astragalus vexilliflexus
(see State Rank Reason below)
MNPS Threat Rank
State Rank Reason (see State Rank above)
Numerous collections from a wide range in the state. Probably undercollected from eastern Montana. It is a frequent component of short-grass steppe.
Perennial often forming loose mats from a branched caudex. Herbage glabrate to densely strigillose. Stems prostrate to ascending, 5–30 cm. Leaves with 7 to 11 linear-lanceolate to narrowly elliptic leaflets, glabrate above, 5–12 mm long with acute tips; stipules lanceolate, 2–4 mm long, basally connate. Inflorescence ca. as long as the leaves, with 5 to 10 spreading flowers. Flowers white to purple; calyx black- and/or white-strigose; sepals 1–2 mm long; banner 6–8 mm long, erect; keel 3–6 mm long, purple-tipped. Legume spreading, narrowly ovate, white-strigillose, 6–13 mm long, flattened but swollen around the seeds (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Compact and pulvinate forms are similar to Astragalus kentrophyta, which differs in having stiffly pungent leaflets that are continuous with, not jointed, to the leaf rachis. The narrowly endemic A. vexilliflexus var. nubilus of central Idaho differs in being (sub)alpine, consistently compact and low to the ground, and in having loosely silky-villous hairs. This form should be sought in SW Montana.
BC to SK south to ID, WY and SD (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
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- Additional ReferencesLegend: View Online Publication
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- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.