United States, Minnesota, Sherburne, 1.25 mi E of the middle of Lake Ann in Sand Dunes State Forest. SW1/4 NE1/4 Sec23, T34N, R27W.;Sand Dunes State Forest;034N;27W;23
45.424257 -93.659613 +-421m.
Growing in central portion of a small wet depression (dry this year) dominated by a nearly continuous, 1m tall network of Polygonum sagittatum. With Polygonum natans, Lycopus uniflorus, Bidens etc.