United States, Minnesota, Sherburne, Sherburne Co. 1.25 mi E of the middle of Lake Ann in Sand Dunes State Forest. SW1/4 NE1/4 sec.23, T34N, R27W;Sand Dunes State Forest;034N;27W;23
45.421968 -93.663561 +-969m.
Growing at the edge of a small wet depression (dry this year). Central area dominated by Polygonum sagittatum and occasional Polygonum natans, Lycopus uniflorus, Glyceria grandis, and Ludwigia etc.