12 October 1999.
Iowa, United States
Locality: Northwest corner of intersection between Eastland and Highway 141, ~2 miles east of Sloan, just north of Woodbury/Monona County line, Woodbury County.
Coordinates: 42.2292, -96.1936
(Map it)
Georeference protocol: Lat/Lon determined via Map location
Environment description: Roadside ditch along a corn field.
Number of plants sampled: 100
Comment: About 100 plants sampled from a population size of thousands.
Collector(s):