Silphium terebinthinaceum var. terebinthinaceum

From Flora of Indiana (1940) by Charles C. Deam

Found here and there in all parts of the state but frequent to common in the prairie area. It has a very wide range of habitat -from the crest of a wooded sandstone ridge to a marsh. It is generally found in a prairie habitat along roadsides and railroads and rarely on open, wooded or gravelly slopes.