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Montana Field Guides

Long-spur Lupine - Lupinus arbustus
Other Names:  Lupinus laxiflorus

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:

External Links

General Description
Perennial from a shallow, branched caudex. Stems erect to ascending, 30–70 cm, glabrate to strigillose, little branched. Leaves mainly cauline; basal petioles 8–15 cm long; leaflets 7 to 11, 3–10 cm long with acute to mucronate tips, glabrate to strigose. Racemes loose to moderately dense, higher than the leaves, 6–20 cm long. Flowers blue and yellow; calyx tube 1–2 mm long, distended behind the pedicel into a spur 1–2 mm long; upper lip 2–3 mm long; lower lip slightly longer; banner 8–11 mm long, sparsely pubescent around the upper calyx lobe, reflexed <45°; wings 7–12 mm long, sometimes hairy at the tip. Legume 15–35 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

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

Observations in Montana Natural Heritage Program Database
Number of Observations: 24

(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)


  • Additional ReferencesLegend:   View Online Publication
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    • Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Long-spur Lupine — Lupinus arbustus.  Montana Field Guide.  .  Retrieved on , from