Well, pardner (in the voice of John Wayne), keep your hoss away from this one! It will cause Parkinson's like symptoms if he eats it. This Eurasian invader became the last image of that day's ride through Colorado. It was growing in the neglected lot next to the motel. Russian knapweed now has been reported from AR, AZ, CA, CO, IA, ID, IL, IN, KS, KY, MI, MN, MO, MT, ND, NE, NV, NV, OH, OK, OR, SD, TX, UT, WA, WI, WY, AB, BC, LB, ON, and SK. Montrose Co, CO, 6/20/13.