United States, Wisconsin, Barron, Beaver Dam Lake
45.54096° N, 92.02388° W; T35N R13W sec06
Located floating or just under the surface in stagnant bays. Common assoc.: (Nymphaea odorata) white water lily, (Nuphar variegata) spatterdock, (Riccia fluitans) slender riccia, (Ricciocarpus natans) purple-fringed riccia.
Uncommon; scattered individuals occur interspersed between the lilypads primarily in eastern half of lake.