United States, Wisconsin, Dodge, Horicon Marsh Wildlife Area.
43.46572721 -88.61105565 33380
T12N R16E sec32
On an old impoundment. Growing with 4 other members and with Potamogeton pectinatus, all very sparse, in a very exposed open water area, no flow, clear water, and anchored in 2 ft. of water, in rich organic marsh sediments.