24 September 1996.
Iowa, United States
Locality: River Junction Access of Iowa River 1 mile south of Highway 22, Section 12, Fremont Township, T77N, R5W, Riverside Quad, Johnson County.
Coordinates: 41.4917, -91.1250
(Map it)
Elevation: 158m.
Number of plants sampled: 40
Comment: Pop 17.
Collector(s):