14 October 2008.
Illinois, United States
Locality: Edward Madigan State Park (formerly known as Railsplitter State Park), SE 1/4 of SE 1/4 of Section 2, T19N, R3W, Lincoln West Quad, Logan County.
Coordinates: 40.1258, -89.3889
(Map it)
Elevation: 166m.
Georeference protocol: Lat/lon determined by GPS
Number of plants sampled: 12
Associated species: Acer saccharinum, Carya x lecontei, Juglans nigra, Lysimachia nummularia, Morus, Salix, and Vitis cinerea.
Comment: Nice population of mature specimens sampled. Some specimens had poor seed quality due to underdeveloped embryos.
Collector(s):