25 September 1996.
Illinois, United States
Locality: Along Illinois River 5 miles south of Peoria on Highway 24, Section 25 or 26, T7N, R6E, Glassford Quad, Peoria County.
Coordinates: 40.5333, -89.7667
(Map it)
Elevation: 137m.
Number of plants sampled: 16
Comment: Pop 20. Most individuals small and immature. Abnormally high number of males in population.
Collector(s):