United States, Wisconsin, Polk, Horseshoe Lake. Polk/Barron Counties [Polk Co.- from lat.long.]
45.44718° N, 92.15993° W; T34N R15W sec12
Located at edge of the lake in mucky soil. Scattered locations along shore and on floating peat near the point. Common assoc.: (Pontederia cordata) pickerelweed, (Sagittaria latifolia) common arrowhead.