Native Plants

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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

70 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Size Notes: Up to about 8 feet tall.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

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

Distribution

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

Growing Conditions

Light Requirement: Sun

Benefit

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

Bibliography

Bibref 946 - Gardening with Prairie Plants: How to Create Beautiful Native Landscapes (2002) Wasowski, Sally

Search More Titles in Bibliography

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

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

Metadata

Record Modified: 2023-01-16
Research By: TWC Staff

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