Diffuse Knapweed

(Centaurea diffusa Lam.)

Asteraceae (Sunflower Family)

▲▼ young plants

 

▲ first year rosette

▲ ▼ mature, flowering plants

▲ flowering stem showing white flowers

flowers ▲▼, with above showing the comb-like spines on the bracts

▲▼ large colonies of diffuse knapweed in Arizona

Diffuse knapweed  (mentioned on p. 99, Weeds of the Great Plains)

o        biennial with leaves similar to spotted knapweed

o        has white flowers and comb-like toothed bracts under inflorescence

o        not found here, yet, but common near & west of Rocky Mountains

o        allelopathic