This tetraploid (2n = 72) occurs mostly in prairie remnants of the upper midwest, with only a few disjunct localities in eastern states (FNA 25, K). In Ky. it is known only from three localities: in BULL (Cedar Creek Glades, at KY); CRIT (Crittenden Springs Glade, at EKY); and LIVI (Rosenfield Glade, pers. comm. of M. Evans).