Your search found 6 image(s) of involucral bracts of Rattlesnake-root.
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Slender Rattlesnake-root,
Nabalus autumnalis
Calyculi green to purple, triangular to subulate; phyllaries pink or purple, 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 Mountain Rattlesnake-root,
Nabalus roanensis
The involucres have some long spreading hairs and black-tipped bracts, per Wildflowers of the Southern Mountains.
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Tall Rattlesnake-root,
Nabalus altissimus
Usually 5 florets in each head, subtended by 5 smooth principal bracts, per Wildflowers of the Southern Mountains.
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Lion's-foot Rattlesnake-root,
Nabalus serpentaria
Involucre has 8 principal bracts w a few long coarse hairs, oft black-dotted, per Wildflowers of Tennessee.
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Barbed Rattlesnake-root,
Nabalus barbatus
Phyllaries densely setose [covered with bristles], per Weakley's Flora (2012).