13 October 1999.
Iowa, United States
Locality: South side of 280th Street, just east of Interstate 29 overpass, Harrison County.
Coordinates: 41.6033, -95.9592
(Map it)
Georeference protocol: Lat/Lon determined via Map location
Environment description: Deep roadside ditch along margin of harvested soybean field. Some water in ditch.
Number of plants sampled: 50
Comment: ~50 plants sampled from a population size of ~100.
Collector(s):