United States, Minnesota, Anoka, Carlos Avery State Wildlife Management Area. At the control structure of pool 9, about 4.5 km (2.8 miles) W-SW of the town of Wyoming.
45.31981 -93.05747
T033N R22W sec26
Associated with Pilea fontana, Cyperus strigosus, Agalinis tenuifolia, Zizania palustris var. palustris.