United States, Minnesota, Pine, 6.5 mi SE of the town of Rock Creek; banks of the St. Croix River. NE1/4 of SW1/4 of section;Chengwatana State Forest;038N;20W;34
45.730092 -92.919762 +-26866m.
Plants occur along the bank; assoc. with Echinochloa muricata, Apios americana, Lespedeza capitata, VErnonia fasciculata.