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Montana Field Guides

Torrey Bitterweed - Hymenoxys torreyana
Other Names:  Tetraneuris torreyana

Potential Species of Concern
Native Species

Global Rank: G4
State Rank: S3S4
State Threat Score: No Known Threats

Agency Status


External Links

General Description
Caudex branched, mat-forming. Stems simple, erect, scapose, 3–10 cm. Herbage punctate-glandular, villous on stem and leaf bases. Leaf blades narrowly oblanceolate, entire, 1–5, cm long. Heads solitary; involucres 7–11 mm high; phyllaries subequal, lanceolate to ovate, scarious-margined, glandular, villous. Ray ligules 7–11 mm long. Disk corollas 4–5 mm long, glandular. Achenes 3–4 mm long; pappus scales 5–7 (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Lesica (2012) treats this species in the genus Tetraneuris.

Species Range
Montana Range Range Descriptions


Range Comments
Carbon County, MT; WY, UT and CO (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 52

(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 ridges and meadows at low to high elevations in the mountains, often on limestone-derived soil in juniper woodlands, mountain mahogany woodland, and cushion plant grasslands.
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habitat Model available.

To learn how these Models were created see

  • 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
    Do you know of a citation we're missing?
    • 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 Unpublished report to the Bureau of Land Management.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.
  • Web Search Engines for Articles on "Torrey Bitterweed"
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Citation for data on this website:
Torrey Bitterweed — Hymenoxys torreyana.  Montana Field Guide.  .  Retrieved on , from