United States, Wisconsin, Sawyer, Chetac Lake
45.69911° N, 91.49395° W; T37N R09W sec09
Thick muck bottom in shallow water 0-1.0 meter deep. Common assoc.: (Potamogeton natans) floating-leaf pondweed, (Spirodela polyrhiza) large duckweed, (Schoenoplectus tabernaemontani) softstem bulrush, (Lemna minor) small duckweed,
Common to abundant in the bay west of the islands. [There is a duplicate accession number for a specimen of Heteranthera dubia; 7/21/2008; Berg, Matthew S.; 2008-112; Sawyer Co.- editor added "a"].