Within Ky., this southern (pantropical) species of sunny, seeping, calcareous outcrops is concentrated in the central Cumberland Rv. and Green Rv. systems. It has not been rediscovered at some localities with older colls: from POWE at "Natural Bridge" (MUR: T.N. McCoy, 6 Dec 1959); from CART (1899; "Carter Caves") and WHIT (1883; "cavernous cliffs, Cumberland Falls"), both mounted on one sheet at GH (A. Risk, pers. comm.). The location in WHIT may be doubted; downstream, PULA has the largest cluster of records in the state. The record from NELS is also old and possibly from adventive plants; details need checking (Cranfill 1980).