United States, Wisconsin, Polk, North Pipe Lake
T35N R15W sec10
Muck bottom in 0-2 meters where it forms dense canopies with other floating leaf species. Common assoc.: (Brasenia schreberi) watershield, (Nuphar variegata) spatterdock, (Pontederia cordata) pickerelweed.
Common in sheltered bays of both lakes. [There is a duplicate accession number for a specimen of Nuphar variegata; 11Jul2007; Wakchad, Dan; Menominee Co.- editor added "a"].