This widespread western perennial species, in its typical variant, may be unknown in the Ohio Valley (Sullivan 2004; Ch). It has been reported from Ky. by Grubbs (1989) and others (M), but no coll. has been confirmed. The more eastern subglabrata has often been combined as a variety (e.g. Y), but differences in morphology and range may be significant (e.g. F), and deserve deeper analysis. P. longifolia reportedly differs as follows (F, Y): leaves averaging smaller (2.5-8 cm long versus 3-13 cm), lanceolate to narrowly elliptic (versus ovate to elliptic-ovate), thicker, tending to be angled at base (versus rounded to truncate), the petioles mostly 1-3 cm (versus 3-6 cm); calyx lobes triangular (versus ovate or triangular); corollas averaging narrower (ca. 1-1.5 cm versus 1.5-2.5 cm) and shorter (ca. 1-1.5 cm versus 1.2-2 cm); berries greenish to yellow (versus reddish to purple); 2n = 24 or 48 (versus only 24).