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Plant Database

Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.

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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)


From the Image Gallery

39 photo(s) available in the Image Gallery

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

Growing Conditions

Light Requirement: Sun


Attracts: Butterflies
Nectar Source: yes

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 on display at the following locations:

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

1 collection(s) available in the Wildflower Center Seed Bank

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

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