United States, Wisconsin, Douglas, Minong Flowage [Washburn Co. - original in error based on Lat./Long.]
46.17283° N, 91.93111° W; T43N R13W sec25
Plants were in still areas over muck in water <1m. Common assoc.: Utricularia vulgaris) common bladderwort, (Brasenia schreberi) watershield, (Utricularia intermedia) flat-leaf bladderwort, (Myriophyllum verticillatum) whorled water milfoil,
Rare being found in a few locations in north bays. ID based on Crowe and Hellquist. Other authors consider this taxon synonymous with S. chlorocarpum. It has many fewer leaves (erect and floating) but may be an aquatic growth habit of S. chlorocarpum.