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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 15.7 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.
Dense cedar woods.
Mount Revelstoke National Park, British Columbia, Canada.