27 September 1996.
Illinois, United States
Locality: Directly north of Ursa on east side of Highway 96, Section 18, T1N, R8W, Mendon Quad, Adams County.
Coordinates: 40.0750, -91.3667
(Map it)
Elevation: 189m.
Environment description: Soybean field.
Number of plants sampled: 100
Comment: Pop 24. Population of approximately 300.
Collector(s):