PlantSnap identifies a Stiff sunflower (Helianthus pauciflorus)
Adding More Native Plants to Your Wildscapes, by Susie Marten
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.