Showing 3 types of KNAPWEED
Native to Europe, but now spread widely throughout the Pacific Northwest and in localized areas of the Northeast U. S.
A native of Eurasia that was introduced to the United States in the late 1800’s, and now is widely distributed over the western U.S.
Accidentally introduced from Europe as a contaminant in crop seeds, and now one of the major weed pests on rangeland in Montana. It is found throughout the northern half of the United States