United States, Illinois, Washington, Department of Natural Resources land just north of Chip-O-Will Post Oak Flatwoods. South side of the Kaskaskia River, north of Venedy Station and east of Halfmoon Lake and Sipple Slough. Okawville Quadrangle. Elevation about 410 feet.
Growing in post oak flatwoods at edge of swamp with Quercus palustris, Quercus bicolor, Vitis palmata, Crataegus punctata, Scutellaria lateriflora, Carex squarrosa. Shrub.