This globally rare species is known only from a few disjunct localities on terraces and bluffs along the lower Ohio Rv. (Ky.), central Mississippi Rv. (Ky., Mo. Tenn.), central Tennessee Rv. (Tenn., Ga., Ala.), one in c. Ala. and one in nw. Fla. A report from the upper Tennessee (Obed Rv.) by Schmalzer et al. (1985) was not confirmed (Ch).