Rush Skeletonweed, a new invader threatening our area

Rush skeletonweed is rapidly advancing from the Idaho border where it has long been established along the I-90 corridor towards the Blackfoot watershed and points beyond. Rush skeletonweed is native to Asia, the Mediterranean and North Africa, and was first reported in the United States near Spokane, Washington in 1938. A small infestation was found in Sanders County, Montana in 1991 and has subsequently been reported in Lincoln, Flathead, Ravalli, Lewis and Clark, Beaverhead, Missoula and Treasure Counties as well.

This plant spread rapidly throughout the wheat-growing area of southeastern Au...