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Montana Field Guides

Montana Locoweed - Oxytropis besseyi var. argophylla

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Status Under Review
Native Species

Global Rank: G5T4T5
State Rank: SU

Agency Status


External Links

General Description
See species description.

Diagnostic Characteristics
Barneby (1989, Intermt. Flora, Vol. 3, Part B) uses the following characters to separate variety argophylla: Larger laves 2-8 cm long and shorter than the scapes; leaflets 5-9(11), crowded on arachis less than 2 cm long; pod tumescent but not bladdery, 4-6 mm diameter; leaflets of mature leaves 3-10 mm long.

Species Range
Montana Range Range Descriptions


Range Comments
Southwest MT, northeast-central ID, WY (Park County) and NV (Elko County) (Kartesz 2009).

Observations in Montana Natural Heritage Program Database
Number of Observations: 35

(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)

Commonly on limestone from foothills to subalpine; said to be commin in sw MT (Barneby 1989).

The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus appositus, Bombus bifarius, Bombus centralis, Bombus fervidus, Bombus flavifrons, Bombus melanopygus, Bombus nevadensis, Bombus rufocinctus, Bombus sylvicola, Bombus occidentalis, Bombus insularis, and Bombus kirbiellus (Macior 1974, Bauer 1983, Shaw and Taylor 1986, Williams et al. 2014, Miller-Struttmann and Galen 2014).

  • Literature Cited AboveLegend:   View Online Publication
    • Bauer, P.J. 1983. Bumblebee pollination relationships on the Beartooth Plateau tundra of Southern Montana. American Journal of Botany. 70(1): 134-144.
    • Macior, L.M. 1974. Pollination ecology of the Front Range of the Colorado Rocky Mountains. Melanderia 15: 1-59.
    • Miller-Struttmann, N.E. and C. Galen. 2014. High-altitude multi-taskers: bumble bee food plant use broadens along an altitudinal productivity gradient. Oecologia 176:1033-1045.
    • Shaw, D.C. and R.J. Taylor.1986. Pollination ecology of an alpine fell-field community in the North Cascades. Northwest Science 60:21-31.
    • Williams, P., R. Thorp, L. Richardson, and S. Colla. 2014. Bumble Bees of North America. Princeton, NJ: Princeton University Press. 208 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Web Search Engines for Articles on "Montana Locoweed"
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Citation for data on this website:
Montana Locoweed — Oxytropis besseyi var. argophylla.  Montana Field Guide.  .  Retrieved on , from