United States, Wisconsin, Barron, Lower Turtle Lake
45.37928° N, 92.06736° W; T33N R14W sec02
Located floating or just under the surface in stagnant bays. Common assoc.: (Brasenia schreberi) watershield, (Nymphaea odorata) white water lily, (Nuphar variegata) spatterdock, (Pontederia cordata) pickerelweed, (Lemna minor) small duckweed,
Rare; scattered individuals occur interspersed between the lilypads at a few sties in the north and south bays.