Your search found 4 image(s) of involucral bracts of Rattlesnake-root.
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Slender Rattlesnake-root,
Nabalus autumnalis
Phyllaries 7-8, pink or purple, linear to elliptic, 8-13mm, glabrous, per Flora of North America.
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Gall-of-the-earth,
Nabalus trifoliolatus
Involucre smooth with 7-9 principal bracts and 9-13 ray flowers per head, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
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Roan Rattlesnake-root,
Nabalus roanensis
Inflorescence thyrsoid, the branches very short. Phyllary tips usually black, per Weakley's Flora.
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Lion's-foot,
Nabalus serpentarius
Involucre has 8 principal bracts w a few long coarse hairs, oft black-dotted, per Wildflowers of Tennessee.