Nabalus asper (Michx.) Torr. & A. Gray
Family: Asteraceae
rough rattlesnakeroot
Nabalus asper image
From Flora of Indiana (1940) by Charles C. Deam

Very local in the area shown on the map. It has been reported from Clark, Jefferson, and Steuben Counties by early authors. My specimens were found along roadsides in dry, sandy soil in prairie habitats. Late in 1938 Kriebel and I found it in hard, white clay soil in Spencer County.