13 October 1999.
Iowa, United States
Locality: North side of 240th Street, 0.6 mile east of intersection with Locust Avenue, Monona County.
Coordinates: 42.0086, -96.0281
(Map it)
Georeference protocol: Lat/Lon determined via Map location
Environment description: Roadside ditch along margin of corn field. Associated vegetation: Helianthus grosseserratus (collection 11).
Number of plants sampled: 100
Comment: ~100 plants sampled from a population size of ~250-300.
Collector(s):