27 August 1967.
Wisconsin, United States
Locality: Near airfield on Highway 51, about 1 mile north of Highway 151, Madison, Dane County.
Coordinates: 43.1314, -89.3239
(Map it)
Georeference protocol: Lat/Lon determined via Map location
Environment description: Sunny, moist, low-lying grassy roadside. Irregular application of weed killer in this area.
Comment: Up to 30 plants per square meter. Coordinates estimated based on locality description.
Collector(s):