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 the gravel bar of the MIddle Fork River at the mouth of the large east-west ravine. With Phyla lanceolata, Amaranthus tuberculatus, Cyperus spp. Occasional on this and other gravel bars, lower river bank.