United States, Wisconsin, Barron, Horseshoe Lake Polk/Barron Counties [Barron Co. from lat. long.]
45 -92 47999
45 N, 092 W; T34N R14W sec07
Submergent form was rare over sand and rock bottom areas while emergent form was more common in muck bottom areas. Submergent to 4m; emergent 0-0.5m of water. Common assoc.: (Potamogeton spirillus) spiral-fruited pondweed, (Leersia oryzoides) rice cut-grass, (Potamogeton vaseyi) Vasey's pondweed, (Eleocharis acicularis) needle spikerush, (Elatine minima) waterwort, (Potamogeton bicupulatus) filament-leaf pondweed.