This occurs mostly in base-rich wetlands of upper midwestern and northeastern coastal regions, but with widely scattered disjunct populations across North America. It has been treated as a variety or subspecies of lanceolata by some authors (Ray 1956, Coffey & Jones 1980), and it has also been confused with narrow-leaved plants of ciliata. Treatments and keys have been rather discordant; see also Sm, F, St, Cr, W. Compared to lanceolata, hybrida usually has more conspicuous sepal venation and larger capsules (ca. 3-6.5 x 4-4.5 mm versus 2-4.5 x 2.5-4 mm). Leaves usually lack cilia on blade bases (as found in typical lanceolata) and sometimes even on distal parts of petiole (as in quadrifolia); blades are usually plain green (versus bluish), the larger mid-cauline ones relatively broad (l/w ca. 4-6 versus 8-12), with more rounded and petiolate bases. Plants tend to be taller (up to 9-10 dm versus 5-6 dm), with more, longer branches; leaves tend to decline in size up stems and do not persist at bases (versus increasing up stems and persisting at bases). Rhizomes are relatively short and freely rooting (versus long and stoloniform). There are a few old colls. of hybrida from FAYE (C.W. Short at GH/KY from "moist meadows/ ground near/ around Lexington"), MERC (Univ. of Illinois) and perhaps MCRE (B). But the only convincing post-1950 colls. in Ky. are by MM & JC from HART (ex DHL), W. Meijer from JESS (KY, MO) and E.W. Chester from LYON and TRIG (APSC). Chester also collected an unusually narrow-leaved plant in LYON that suggests a transition to quadriflora.