United States, Wisconsin, Washburn, Minong Flowage
46.15228° N, 91.92489° W; T42N R13W sec01
Muck at the shoreline. Common assoc.: (Eleocharis erythropoda) red-footed spikerush, (Carex comosa) bottle-brush sedge, (Nymphaea odorata) white water lily, (Spirodela polyrhiza) large duckweed.
A single large patch in a tiny pond-like bay near the east boat landing was the only population found.