22 September 2009.
Wisconsin, United States
Locality: Blackhawk Unit, Lower Wisconsin State Riverway, NW 1/4 of SE 1/4 of Section 23, T9N, R6E, Black Earth Quad, Dane County.
Coordinates: 43.2436, -89.7397
(Map it)
Elevation: 226m.
Georeference protocol: Lat/lon determined by GPS
Environment description: Wisconsin River watershed/floodplain
Number of plants sampled: 20
Associated species: Amorpha canescens, Betula nigra, Rhamnus cathartica, Saponaria officinalis, Spartina pectinata, Ulmus rubra, Vitis riparia, and Zanthoxylum americanum.
Collector(s):