United States, Illinois, Massac Co., Boundary of Sielbeck Woods State Natural Area; remnant of Big Black Slough; OH River floodplain; ca. Upper Salem Road; ca. 2 mi. NW of Metropolis; 8 mi. NE of Joppa.
37.1512 -88.732
Soils in Hosmer series; top of Peoria loess cap; wet mesic floodplain forest; Celtis laevigata, Quercus pagoda, Liquidambar styraciflua, Quercus palustris.
{"habit":"Infrequent to occasional perennial; large clumps; multistemmed; pale green; small percentage of culms fertile; spikes pale green; erect."}