These plants are tentatively distinguished from tenuifolia; see notes under that name. However, some colls. appear transitional to lanceolata. Most or perhaps all plants of "longifolia" that are mapped here in western Ky. (in or around the Shawnee Hills) may be referred to Terrell's (1996) "Ozark-Ouachita group" of longifolia. Terrell described this group as having "stems usually puberulent, internodes 4-7, usually longer than in the other groups (20-70 mm long); inflorescence sometimes diffuse; flowering determinate with plants flowering principally in April, May and early June."