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12c. Silphium asteriscus Linnaeus var. simpsonii (Greene) J. A. Clevinger, Novon. 14: 275. 2004.
Silphium simpsonii Greene, Pittonia 4: 44. 1899
Plants 25–110 cm. Leaves: basal persistent; cauline opposite or alternate; faces hirsute, hispid, or scabrous. Paleae puberulent and stipitate-glandular. Ray florets 10–15(–20). Disc florets 85–110.
Flowering summer. Roadsides, meadows, open fields; 0–200 m; Ala., Fla., Ga., Miss., S.C.
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