Weed
squarrose knapweed
AcheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat.
Oblong to obovateObovate:
Inverted egg shaped with apical end the broadest.
Black to white with longitudinal yellow lines and collar
Smooth
Light, bristly pappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. 
; lateral scar.
Background color varies from an extreme black to white.
State Noxious Weed: Arizona, California, Colorado, Nevada, Oregon, Utah, Wyoming
Not included
For more information, see ISMA fact sheet.
Asteraceae
Centaurea virgata Lam. subsp. squarrosa (Willd.) Gugler
Centaurea squarrosa Willd.
Centaurea triumfettii auct. non All.
Centaurea variegata Lam., nom. illeg.
Centaurea virgata Lam. var. squarrosa (Willd.) Boiss.
