United States, Minnesota, Dakota, Part of the Gores Pool #3 Wildlife Management Area. Prescott Island, in the Mississippi River just south of the confluence with the St. Croix River.
44.743301 -92.803536 +-545m. WGS84
T115N R17W sec23
On the north shore of the island on moist sand beach.
Associates include Cyperus odoratus and Cyperus squarrosus.