This variable rhizomatous species (2n = 26, 78, 104) is widespread in southeastern states in thin woods on dry acid soils; segregates remain poorly defined (W). Plants from Ky. appear generally uniform, but several colls. are referable (following F) to the relatively robust var. stellata (Nutt.) B.L. Robins., which has more glabrous or lobed leaves. That taxon has not been recognized in recent treatments.