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Silphium radula (Roughstem rosinweed)
Marcus, Joseph A.

Silphium radula

Silphium radula Nutt.

Roughstem rosinweed

Asteraceae (Aster Family)

Synonym(s): Silphium asperrimum, Silphium dentatum var. gatesii, Silphium gatesii

USDA Symbol: sira2

USDA Native Status: L48 (N)


Plant Characteristics

Duration: Perennial
Habit: Herb

Bloom Information

Bloom Color: Yellow
Bloom Time: Jun , Jul , Aug


USA: AL , AR , GA , LA , MS , NC , OK , SC , TX

Value to Beneficial Insects

Special Value to Native Bees

This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:

Fredericksburg Nature Center - Fredericksburg, TX

Wildflower Center Seed Bank

LBJWC-TS-3 Collected 2009-07-02 in Travis County by Lady Bird Johnson Wildflower Center

Additional resources

USDA: Find Silphium radula in USDA Plants
FNA: Find Silphium radula in the Flora of North America (if available)
Google: Search Google for Silphium radula


Record Last Modified: 2009-02-18
Research By: TWC Staff

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