24 September 1996.
Iowa, United States
Locality: Sullivan Slough River Access of Mississippi River, Section 5, Concordia Township, T68N, R2W, Lomax Quad, Des Moines County.
Coordinates: 40.7250, -91.1250
(Map it)
Elevation: 137m.
Number of plants sampled: 60
Comment: Pop 18.
Collector(s):