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Tweedy's Gilia - Gilia tweedyi
Other Names:  Gilia sinuata var. tweedyi, Gilia inconspicua var. tweedyi

Potential Species of Concern
Native Species

Global Rank: G4G5Q
State Rank: S3S4
(see State Rank Reason below)
State Threat Score: No Known Threats

Agency Status


External Links

State Rank Reason (see State Rank above)
Gilia tweedyi is locally common on the south and west sides of the Pryor Mountains in the drainages of the Bighorn and Clarks Fork of the Yellowstone rivers and is also known from Beaverhead County.
General Description
Stems erect, 5–25 cm, usually branched above. Herbage loosely tomentose, stipitate-glandular especially above. Leaves: basal oblanceolate, 2–5 cm long, deeply pinnately lobed, lobes lance-linear, mucronate; cauline few. Inflorescence terminal, leafy-bracteate cymes with ascending pedicels. Flowers: calyx 3–5 mm long, purple spotted, swollen in fruit; corolla funnelform, blue, with a yellow throat, tube 4–5 mm long; lobes ca. 1 mm long. Capsule 4–5 mm long with several seeds per locule (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Blooming in May and June.

Species Range
Montana Range Range Descriptions


Range Comments
OR to MT south to NV, ID and WY (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 30

(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)

Open, sandy soil in juniper woodlands, sagebrush and desert shrublands in the valleys and foothills.
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habitat Model available.

To learn how these Models were created see

As an annual, population sizes may undergo large annual fluctuations and may respond positively to light or moderate levels of disturbance.

  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
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    • Lesica, P. and P.L. Achuff. 1992. Distribution of vascular plant species of special concern and limited distribution in the Pryor Mountain desert, Carbon County, Montana. Unpublished report to the Bureau of Land Management. Montana Natural Heritage Program, Helena, MT. 105 pp.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
    • Meier, G.A. 1997. The colonization of Montana roadsides by native and exotic plants. M.Sc. Thesis. Bozeman, MT: Montana State University. 45 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:
Tweedy's Gilia — Gilia tweedyi.  Montana Field Guide.  .  Retrieved on , from