Silphium dentatum Elliott, Sketch Bot. S. Carolina 2: 468. 1823; S. asteriscus var. angustatum A. Gray; S. elliottii Small; S. incisum Greene; S. nodum Small

Plants 50–150 cm. Leaves: basal caducous; cauline opposite or alternate; faces hirsute, hispid, or scabrous. Paleae puberulent. Ray florets 8–13 . Disc florets 35–120. 2n = 14.

Flowering summer. Meadows, open forests, along roadsides; 0–1000 m; Ala., Fla., Ga., N.C., S.C., Tenn.

Varieties dentatum and angustatum are variable in the character of stem vestiture, have overlapping geographic ranges, and therefore are best treated as one variety.