This perennial diploid (2n = 16) is known mostly from the Ridge and Valley region, from W.Va. and Md. to Tenn. and N.C. It also occurs along the Kentucky River Palisades and at a few sites along the Cumberland Rv. in central Tenn. (K). T. Littlefield (pers. comm.) has recently discovered it along the Ohio Rv. in TRIM. Inexplicable unvouchered records of Nye (1961) from additional northern counties of Ky. are rejected. Ky. plants may all be referred to var. glabrifolia E.L. Braun, which has leaves and stems glabrous or nearly so (F). Although that variety is not recognized in most recent treatments (e.g. Al-Shehbaz 1987; FNA 7), the potential genetic distinction of this disjunct population deserves attention.