United States, Minnesota, Otter Tail, Sonnenberg Wildlife Management Area. Otter Tail County...Sonnenberg State Wildlife Management Area...1.5 miles north-northeast of Vergas...T137N R40W NW1/4 of SW1/4 Sec. 18. 137N 40W 18
46.679884 -95.7841106 +-800m.
rather strongly-rolling forested terrain ... in outer portions of poor fen, in five-acre basin. Rooted in wet peat, often in shallow water in the lag between the upland margin and firmer central portions of the sedge mat. Mostly in full sun. Associated species include Potentilla palustris, Calla palustris, Polygonum sagittatum, Cicuta bulbifera, Triadenum fraseri, Glyceria grandis, Carex lacustris, C. stricta, Dulichium arundinaceum