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Montana Field Guide

Montana Field Guides

Western Rock-jasmine - Androsace occidentalis

Native Species

Global Rank: G5
State Rank: S4S5
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:
C-value: 3

External Links

State Rank Reason (see State Rank above)
Common throughout at least western and southcentral counties. Grows in disturbed as well as pristine sites and in a wide variety of habitats.
General Description
Puberulent, taprooted annual. Scapes usually several, 1–6 cm. Leaves lanceolate to oblanceolate, 4–12 mm long, entire. Umbel several-flowered, subtended by obovate bracts; pedicels 2–35 mm long. Flowers: corolla white, 1–2 mm across, included in the calyx; calyx hemispheric, 3–5 mm long, keeled below each lobe. Capsules 2–3 mm across (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


Range Comments
Ontario to British Columbia, Arizona to Texas and Missouri.

Observations in Montana Natural Heritage Program Database
Number of Observations: 161

(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)

Grasslands, steppe, open forest, sometimes in disturbed soil; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Additional ReferencesLegend:   View Online Publication
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    • Chadde, S.W. 1985. Initial recovery patterns of southwestern Montana foothill range. M.Sc. Thesis. Bozeman, MT: Montana State University. 103 p.
    • Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
    • Joslin, G.J. 1975. Behavior and environmental selection by Elk (Cervus canadensis nelsoni) during surrmer and fall in the First and Second Yellow Mule drainages, Madison County, Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University, Bozeman. 65 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Quire, R.L. 2013. The sagebrush steppe of Montana and southeastern Idaho shows evidence of high native plant diversity, stability, and resistance to the detrimental effects of nonnative plant species. M.Sc. Thesis. Bozeman, MT: Montana State University. 124 p.
    • Seipel, T.F. 2006. Plant species diversity in the sagebrush steppe of Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 87 p.
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Citation for data on this website:
Western Rock-jasmine — Androsace occidentalis.  Montana Field Guide.  .  Retrieved on , from