United States, Illinois, Iroquois, Beaverville Township, at Dead end of 3200 North, 0.9 mile west of 3200 East (Indiana State Line), at edge of giant pig farm.
Open, disturbed edge of moist oak woods, with Aronia, Osmunda regalis, Carex scoparia and other Carex. Frequent in spreading clumps, fertile culms nearly prostrate.