Further research is needed to determine the status of this taxon, which may be largely restricted to the central Mississippi Valley or nearby, with records from Ala., Ark., Ill., Ky., Miss. and Tenn. (PL, W), plus a disjunct verified coll. from S.Car. (SERNEC). Var. pubescens has not generally been recognized in recent treatments (FNA 23). It was recently discovered in CLIN and LYON by R. Naczi (Naczi et al. 2002) and L. McKinney (EKY; det. T.W. Smith); then in HART by R. Seymour (pers. comm.).