Silphium asteriscus var. asteriscus

Synonyms: Silphium asperrimum Hooker Silphium asteriscus var. scabrum (C. Mohr) H. E. Ahles Silphium dentatum var. gatesii L. M. Perry Silphium gatesii Michaux Silphium integrifolium var. gattingeri Silphium laevigatum Elliott Silphium scaberrimum
Treatment appears in FNA Volume 21. Treatment on page 82.

Plants 40–150 cm. Leaves: basal caducous; cauline opposite or alternate; faces hirsute, hispid, or scabrous. Paleae puberulent to scabrous. Ray florets 8–20. Disc florets 35–110. 2n = 14.

Phenology: Flowering summer–early fall.
Habitat: Prairies, meadows, open forests, roadsides
Elevation: 50–1000 m



Ala., Ark., Fla., Ga., Ky., La., Miss., Mo., N.C., Okla., S.C., Tenn., Tex., Va.


The name Silphium asperrimum has been misapplied to S. radula. Based upon examination of a photograph of the type and of the original description, S. asperrimum should be synonymized with S. asteriscus.

Selected References


Lower Taxa

Jennifer A. Clevinger +
Linnaeus +
Ala. +, Ark. +, Fla. +, Ga. +, Ky. +, La. +, Miss. +, Mo. +, N.C. +, Okla. +, S.C. +, Tenn. +, Tex. +  and Va. +
50–1000 m +
Prairies, meadows, open forests, roadsides +
Flowering summer–early fall. +
Silphium asperrimum +, Silphium asteriscus var. scabrum +, Silphium dentatum var. gatesii +, Silphium gatesii +, Silphium integrifolium var. gattingeri +, Silphium laevigatum +  and Silphium scaberrimum +
Silphium asteriscus var. asteriscus +
Silphium asteriscus +
variety +