11. This weevil has been shown to reduce diffuse knapweed density at several sites. 12. Still from a Rana installation monitoring a knapweed flower. 13. Herbs include meadow buttercup, lesser knapweed and devil's bit scabious. 14. Flowers include ragged robin, oxeye daisy and knapweed . 15. A week of drizzles in early July caused knapweed and water basswood to flower. 16. Diffuse knapweed is known to establish more easily and effectively in recently disturbed environments. 17. In the Asteraceae, the knapweed " Centaurea diffusa " forms tumbleweeds. 18. Common plant include yarrow, birdsfoot trefoil, knapweed and ox-eye daisy. 19. He called the knapweed study exciting because it would encourage others to try similar efforts. 20. Areas in which diffuse knapweed has been established generally are plains rangelands or forest benchlands.
