United States, Minnesota, Koochiching, Extensive patterned peatland complex along the South Fork Black River, 20 miles northwest of Big Falls, 25 miles northeast of Waskish.
Quite local in a narrow zone of beaver-flooded ash swamp, on the margin of an upland rise east of the river. Occasional in shallow water along the margins of a beaver run that extends into the swamp from a nearby beaver pond. Shaded by patchy canopy of young Fraxinus nigra, and a tall shrub layer of Alnus incana.
Associates include Carex lacustris, C. retrorsa, Glyceria striata, Ranunculus gmelini, Mimulus ringens, Scutellaria lateriflora, Caltha palustris, Equisetum arvense.