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Montana Field Guide

Montana Field Guides

Short-spine Horsebrush - Tetradymia spinosa

Status Under Review
Undetermined Origin

Global Rank: G5
State Rank: SU

Agency Status
MNPS Threat Rank:

External Links

General Description
Spiny horse brush Plants to 100 cm tall. Stems spiny, tomentose, highly branched. Primary leaves converted to spines ca. 1 cm long; fascicled leaves linear, glabrous, 7–15 mm long. Inflorescence of axillary heads. Involucre 8–12 mm high; phyllaries 4 to 6, tomentose. Disk corollas 7–12 mm long. Achenes 6–8 mm long, densely puberulent (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
OR to MT south to CA, UT and NM (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 12

(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)


  • Additional ReferencesLegend:   View Online Publication
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    • 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.
    • Taylor, K., T. Brummer, L.J. Rew, B.D. Maxwell. 2014. Bromus tectorum response to fire varies with climate conditions. Ecosystems 17(6): 960-973.
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Citation for data on this website:
Short-spine Horsebrush — Tetradymia spinosa.  Montana Field Guide.  .  Retrieved on , from