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Montana Field Guide

Montana Field Guides

Devil's-club - Oplopanax horridus

Native Species

Global Rank: G5
State Rank: S5

Agency Status
MNPS Threat Rank:
C-value: 7

External Links

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 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: 230

(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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

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