Typical pallida occurs mostly in marshy habitats of northeastern states and adjacent Canada. Closely related plants (varieties or subspecies) occur in western North America and East Asia (FNA 24, Kowano & Koyama 1964). The only Ky. records are from swamps in BALL and LIVI during the 1970s, plus two old colls. from JEFF: (1) by H. Griswold via C.W. Short in the 1830s;from "swamps about Louisville" (F, PH); and (2) by C. Mohr, 1854 from "Louisville" (US).