This variable rhizomatous species (2n = 26, 52, 78) is considered native only in east-coastal states from S.C. to Md. However, it has been widely grown for ornamental use and has locally escaped (Smith 1976; Cr, W). In Ky. it has been reported several times (M), but the only known coll. is from JEFF (KY-Agr., EKY): P.E. Allison, 22 Jun 1928, Louisville.