Your search found 22 image(s) of involucral bracts of Bidens and Coreopsis.
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Coreopsis grandiflora var. grandiflora
Outer involucral bracts green, lanceolate; inner eliptic to lanceolate, per Vascular Flora of the Carolinas.
Coreopsis pubescens +
Here the outer phyllaries are spreading, the inner just beginning to open.
The inner involucral bracts not yet open, flower heads sealed up like pillboxes.
Outer involucral bracts leafy, typically surpassing the disk, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Outer involucral bracts curled and twisted, and longer than inner bracts, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.