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Montana Field Guide

Montana Field Guides

Gray Horsebrush - Tetradymia canescens

Native Species

Global Rank: G5
State Rank: S4

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Plants to 80 cm tall. Stems unarmed; twigs tomentose. Primary leaves narrowly oblanceolate, 1–2 cm long, tomentose; fascicled leaves smaller. Inflorescence heads terminating branches in a corymbiform array. Involucre 7–10 mm high; phyllaries 4, tomentose. Disk corollas 7–12 mm long. Achenes 3–5 mm long glabrous or sericeous (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

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

Observations in Montana Natural Heritage Program Database
Number of Observations: 311

(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
    Do you know of a citation we're missing?
    • Grove, A.J. 1998. Effects of Douglas fir establishment in southwestern Montana mountain big sagebrush communities. M. Sc.Thesis. Bozeman, MT: Montana State University. 150 p.
    • Guenther, G.E. 1989. Ecological relationships of bitterbrush communities on the Mount Haggin Wildlife Management Area. M.Sc. Thesis. Bozeman, MT: Montana State University. 73 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Gray Horsebrush — Tetradymia canescens.  Montana Field Guide.  .  Retrieved on , from