United States, Illinois, Lee, Green River State Conservation Area. Green River Lowland Section of the Grand Prairie Natural Division. Coordinate Datum: WGS84/NAD83. Large Marsh.
41.63805 -89.5337
T. 19N, R. 8E, SW1/4 NW1/4 Sect. 13
Growing in large marsh with Apocynum sibiricum, Hibiscus laevis, Mimulus ringens, Phragmites australis, Potentilla norvegica, Rumex orbiculatus, Scirpus acutus, Scutellaria galericulata, Sium suave, etc. Perennial herb, locally abundant.