Thistle2
- Cirsium hookerianum, common name Hooker's thistle or white thistle, is a North American species of thistle native to western Canada and the northwestern United States. (wikipedia.org)
- Flora of North America, Hooker's or white thistle, Cirsium hookerianum Nutt. (wikipedia.org)
List1
- The Plant List, Cirsium hookerianum Nutt. (wikipedia.org)