United States, Illinois, Kankakee, Liebert (The Nature Conservancy Property). St. Anne Township. St. Anne 7.5 minute topographic map.
Male flowers still blooming. In black oak savanna. Found growing with: Quercus velutina, Carex pensylvanica, Schizachyrium scoparium, Rumex acetosella, Claytonia virginica, Sassafras albidum, and Prunus serotina