Your search found 5 image(s) of involucral bracts of Silphium.
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Silphium compositum var. compositum
Bracts wide, usually squarrose, acute or obtuse, glabrous, ciliate or erose, per Vascular Flora of the Carolinas.
Silphium asteriscus var. dentatum
Involucral bracts of the genus Silphium are wide and usually squarrose, per Vascular Flora of the Carolinas.
Silphium asteriscus var. asteriscus
Rows of large recurved bracts beneath the disc form a cup-like shape, per All About South Carolina Wildflowers.