Cirsium hookerianum Nutt.

Cirsium hookerianum Nutt.. Cirsium hookerianum, Hooker's thistle or white thistle, is a North American species of thistle native to western Canada and the northwestern United States. It is found in the northern Rocky Mountains as well as in some of the northern Cascades and Coast Ranges, in Alberta, British Columbia, Washington, Idaho, Montana, and Wyoming.