Silphium asteriscus var. dentatum

(Elliott) Chapman

Fl. South. U.S., 221. 1860.

Basionym: Silphium dentatum Elliott Sketch Bot. S. Carolina 2: 468. 1823
Synonyms: Silphium asteriscus var. angustatum A. Gray Silphium elliottii Greene Silphium incisum Small Silphium nodum
Treatment appears in FNA Volume 21. Treatment on page 82.

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.

Phenology: Flowering summer.
Habitat: Meadows, open forests, along roadsides
Elevation: 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.

Selected References


Lower Taxa

Jennifer A. Clevinger +
(Elliott) Chapman +
Silphium dentatum +
Ala. +, Fla. +, Ga. +, N.C. +, S.C. +  and Tenn. +
0–1000 m +
Meadows, open forests, along roadsides +
Flowering summer. +
Fl. South. U.S., +
Illustrated +  and Endemic +
Silphium asteriscus var. angustatum +, Silphium elliottii +, Silphium incisum +  and Silphium nodum +
Silphium asteriscus var. dentatum +
Silphium asteriscus +
variety +