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Montana Field Guide

Montana Field Guides

Devil's-club - Oplopanax horridus

Native Species

Global Rank: G5
State Rank: S5
C-value: 7

Agency Status


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General Description
Deciduous shrubs. Stems densely spiny, 1–2 m, usually unbranched. Herbage villous with spines along the leaf veins and petioles. Leaf blades orbicular, cordate, 10–30 cm wide with 5 to 9 acuminate, dentate lobes. Inflorescence dense umbels in a raceme 8–20 cm long. Flowers greenish; sepals minute; petals 2–3 mm long; stamens 5. Drupes red, 4–6 mm wide (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Diagnostic Characteristics
This is the only North American Oplopanax species.

Species Range

Range Comments
Oplopanax horridus is concentrated in the Pacific Northwest, western Canada, and Alaska. It also occurs disjunctly in Michigan and Ontario, where it is considered rare.

Observations in Montana Natural Heritage Program Database
Number of Observations: 365

(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)

Low areas of moist to wet forest, uncommon on avalanche slopes; montane, lower subalpine (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • 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.
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Citation for data on this website:
Devil's-club — Oplopanax horridus.  Montana Field Guide.  .  Retrieved on , from