Your search found 5 image(s) of involucral bracts of Silphium.
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Virginia Cup-plant,
Silphium connatum
Involucral bracts of the genus Silphium are wide and usually squarrose, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Carolina Rosinweed,
Silphium compositum var. compositum
Bracts wide, acute or obtuse, glabrous, ciliate or erose, usually squarrose, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Ragged Rosinweed,
Silphium reniforme
Bracts wide, acute or obtuse, glabrous, ciliate or erose, usually squarrose, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Starry Rosinweed,
Silphium dentatum
Involucral bracts of the genus Silphium are wide and usually squarrose, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Starry Rosinweed,
Silphium asteriscus var. asteriscus
Rows of large recurved bracts beneath the disc form a cup-like shape, per All About South Carolina Wildflowers (Midgley, 1999).