Diffuse knapweed (Centaurea diffusa Lam.)
Diffuse knapweed is perennial, biennial, or sometimes annual weed that produces new shoots from a tap root each year. White or purple flowers appear at the end of each shoot. A single large stem and many branches and leaves are a sage green color. It differs from spotted knapweed in that it has a terminal spine instead of many branches from the base.