United States, Illinois, Vermilion, Middle Fork Woods Nature Preserve at Kickapoo State Park, west of and adjacent to the MIddle Fork River. Danville NW 7.5 minute quadrangle.
T. 19N, R. 12W, NE1/4 SW1/4 NW1/4 NE1/4 Sect. 5
On upper gravel bar on the Middle Fork River at mouth of small creek below main east-west ravine. One 3 m x 3 m patch.