14 September 2016.
South Dakota, United States
Locality: along South Dakota St, east end of Harold Davidson airport, south of Vermillion, Clay county
Coordinates: 42.7633, -96.9244
(Map it)
Elevation: 350m.
Environment description: Grassland and weedy roadside waste area, with deep, sandy soil
Comment: Common in sandy soils near roads; evidence of herbicide resistance in spot-treatment areas near the roadside; potentially test for roundup resistance.
Collector(s):