Your search found 3 image(s) of involucral bracts of Centaurea.
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Bachelor's Buttons,
Cyanus segetum
The involucral bracts have a narrow, dark, fringed margin, per Wildflowers of the Southern Mountains.
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Spotted Knapweed,
Centaurea stoebe ssp. micranthos
Outer involucral bracts w pectinate (comb-like), scarious, blackish apices, per Vascular Flora of the Carolinas.
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Tyrol Knapweed,
Centaurea nigrescens
Heads relatively narrow, the involucres black and green, per Weakley's Flora.