United States, Minnesota, Winona, Upper Mississippi National Wildlife and Fish Refuge. 2.4 miles north-northwest of Minnesota City, just east of Dark Slough, which is just east of Highway 61, in the
44.13 -91.77 +-100m.
T108N R08W sec27
In an open area on shore next to floodplain forest.
Associates include Erysimum cheiranthoides, Arisaema dracontium, and Vitis riparia.