silphium radula

Silphium radula, commonly known as roughstem rosinweed, is a species of flowering plant in the aster family (Asteraceae). It is native North America, where it is found in the South Central region of the United States. Its natural habitat is prairies over sandy or calcareous soil.Silphium radula is an herbaceous perennial, growing to around 0.6m tall. It produces large, showy yellow flowers in the summer.

The taxonomy of the genus Silphium remains unresolved in North America, with the appropriate ...