27 September 2010.
Wisconsin, United States
Locality: Floodplain along railroad, adjacent to Perrot State Park, S 1/2 of Section 20, T18N R9W, Trempealeau Quad, just west of Trempealeau, Trempealeau County.
Coordinates: 44.0150, -91.4782
(Map it)
Elevation: 208m.
Georeference protocol: Lat/lon determined by GPS
Number of plants sampled: 10
Associated species: Acer negundo, Juglans nigra, Quercus, Salix, Toxicodendron radicans, and Ulmus rubra.
Collector(s):