Oplopanax horridus (Sm.) Miq.
Common Name: DEVIL'S-CLUB
Coefficient of Conservatism: 9
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt Shrub
Status: T

Primarily a northwestern species, ranging from southern Alaska and southwestern Yukon to Oregon and northwestern Montana. It is then strikingly disjunct to islands in northern Lake Superior, including Porphyry Island off the Sibley Peninsula and the Slate Islands of Ontario. In Michigan, Devil’s-club thrives at the northeast end of Isle Royale (Blake Point), several of the nearby offshore islands, and Passage Island. It is found especially between rock ridges with fir and paper birch in forested ravines and openings.

The stems (which are often 2 m tall) and leaf veins are all decorated with sharp spines. The flowers are rather fragrant, in an impressive panicle of umbels, and the bright red fruits are held above the densely prickly stem and enormous leaves. Flowers are at their peak about mid-July and fruit is ripe a month later.


Keweenaw County
    Only on Isle Royale


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. November 29, 2022. https://michiganflora.net/species.aspx?id=192.