United States, Minnesota, Dakota, Ordway Field Station, Macalester College; Along the Mississippi River at River Lake, Inver Grove Heights.
44.808628143 -93.0217382458
4961692N 498281E; T27N R22W sec23
210 meters
690 feet
Very locally abundant at the base of steep east- (to quite locally south-) facing bluffs. Forming the dominant cover in a small (~1/4-acre) groundwater seepage zone. Gently-sloping setting on the river bank, a few feet above river level. Wet sandy substrate, often with a shallow organic cap. Full sun. White flowers.