Devil's Club

Devil's club or devil's walking stick (Oplopanax horridus, Araliaceae; syn. Echinopanax horridus, Fatsia horrida) is a large shrub primarily native to the cool moist forests of western North America, but also disjunct on islands in Lake Superior. It is noted for its large palmate leaves and erect, woody stems covered in brittle spines.

Devil's club generally grows to 1 to 1.5 metres (3 ft 3 in to 4 ft 10 in) tall; however, instances exist of it reaching in excess of 5 metres (16 ft) in rainforest gullies. The spines are found along the upper and lower surfaces of veins of its leaves as well as the stems. The leaves are spirally arranged on the stems, simple, palmately lobed with 5-13 lobes, 20 to 40 centimetres (7.9 to 16 in) across. The flowers are produced in dense umbels 10 to 20 centimetres (3.9 to 7.9 in) diameter, each flower small, with five greenish-white petals. The fruit is a small red drupe 4 to 7 millimetres (0.16 to 0.28 in) diameter.

The plant is covered with brittle yellow spines that break off easily if the plants are handled or disturbed, and the entire plant has been described as having a "primordial" appearance. Devil's club is very sensitive to human impact and does not reproduce quickly. The plants are slow growing and take many years to reach seed bearing maturity, and predominately exist in dense, moist, old growth conifer forests in the Pacific Northwest.