This midwestern species of wet prairies has been reported from Ky. (e.g. Jones 1972; FNA 19), with reference to colls. in BALL, HEND, WARR and perhaps elsewhere (M), but details of these colls. are not available. V. fasciculata does occur nearby in s. Ill. It differs from gigantea in its leaves glabrate below, with pits that contain awl-shaped hairs or glands (FNA 19). Jones included the coll. from HEND within the rather disjunct, northern ssp. corymbosa S.B. Jones (with relatively small scabrous leaves and shorter stems). However, that segregate has been hard to distinguish from hybrids between fasciculata and gigantea (St, Y), and it was not recognized in FNA.