Centaurea diffusa Lam.
Family: Asteraceae
spreading knapweed, tumble knapweed, white knapweed
Centaurea diffusa image
Cindy Roche  
Etymology: Centaurea: ancient Greek plant-name, poetically associated with Chiron, the Centaur, but without wholly satisfactory explanation
Plants: annual/biennial forb
Conservation Status: Introduced - adventive