Silphium radula Nutt.
Asteraceae (Aster Family)
Synonym(s): Silphium asperrimum, Silphium dentatum var. gatesii, Silphium gatesii
USDA Symbol: SIRA2
From the Image Gallery
Plant CharacteristicsDuration: Perennial
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 InformationBloom Color: Yellow
Bloom Time: Jun , Jul , Aug
DistributionUSA: AL , AR , GA , LA , MS , NC , OK , SC , TX
Growing ConditionsLight Requirement: Sun
Nectar Source: yes
Value to Beneficial InsectsSpecial Value to Native Bees
This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.
From the National Organizations DirectoryAccording 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 BankLBJWC-TS-3 Collected 2009-07-02 in Travis County by Lady Bird Johnson Wildflower Center
BibliographyBibref 946 - Gardening with Prairie Plants: How to Create Beautiful Native Landscapes (2002) Wasowski, Sally
Search More Titles in Bibliography
Web ReferenceWebref 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 resourcesUSDA: Find Silphium radula in USDA Plants
FNA: Find Silphium radula in the Flora of North America (if available)
Google: Search Google for Silphium radula
MetadataRecord Modified: 2023-01-16
Research By: TWC Staff