Weed
Iberian 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
Light brown with dark brown blotches and few yellow stripes
Smooth
PappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. 
bristles are erect and broad at the base. The scar is deep and lateral.
The collar supports a pappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. and is the same color as the 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.. Scar notch is lateral, near the basalBasal:
The base of the fruit or seed opposite the apical end.
end, and fairly deep.
State Noxious Weed: Arizona, California, Nevada, Oregon
Not included
For more information, see ISMA fact sheet.
Asteraceae
Centaurea iberica Trevir. ex Spreng.
