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Montana Field Guide

Montana Field Guides

Bruneau Mariposa Lily - Calochortus bruneaunis

Species of Concern
Native Species

Global Rank: G5
State Rank: S1S3
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
Known in Montana from one 1941 collection by M. Ownbey approximately 1.5 miles southeast of Lima and a 2009 observation from the Centennial Mtns, though specific observation and locality data are unknown.
General Description
Stem 40–60 cm. Leaf blade linear, ca. 5 mm wide. Bracts 2–4 cm long. Flowers 1 to 4; sepals 1–4 cm long, basally purplish; petals white, 2–4 cm long, apiculate; outer surface with a green midvein; inner surface glabrous with a dark, crescent-shaped mark above the small, circular gland; anthers oblong. Capsule erect, spindle-shaped, 3–7 cm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Flowering in July.

Diagnostic Characteristics
This species is similar to the more common C. nuttallii; however, the latter has sparsely hairy petals near its base which lack the vertical green line.

Species Range

Range Comments
OR, ID, and southwest MT, south to UT, NV, and CA. Peripheral.

Observations in Montana Natural Heritage Program Database
Number of Observations: 11

(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)

Dry meadows and grasslands in the foothills or montane zones.

  • Additional ReferencesLegend:   View Online Publication
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    • Fiedler, P.L. 1985. Heavy metal accumulation and the nature of edaphic endemism in the genus Calochortus (Liliaceae). American Journal of Botany 72(11):1712-1718.
    • Fiedler, P.L. 1986. Concepts of rarity in vascular plant species, with special reference to the genus Calochortus Pursh (Liliaceae). Taxon 35:502-518.
    • Lesica, P. and J. Vanderhorst. 1995. Sensitive plant survey of the Sage Creek area, Beaverhead County, Montana. Unpublished report to the Bureau of Land Management. Montana Natural Heritage Program. 36 pp. plus appendices.
    • 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.
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Citation for data on this website:
Bruneau Mariposa Lily — Calochortus bruneaunis.  Montana Field Guide.  .  Retrieved on , from