This is widely scattered across eastern North America, but largely restricted to regions with extensive boggy wetlands, and generally rare in the Ohio and central Mississippi Valleys (K). Gm (1914) noted "not a common plant in Kentucky." It has been collected during recent decades in CART (KY) and MCRE (EKY). There are also unverified reports from BARR/EDMO (Hussey 1876), FAYE (M. Flynn, pers. comm., 1990), JEFF (J. Wysor, pers. comm., 2018) and perhaps elsewhere.