12 July 2011.
Colorado, United States
Locality: Approximately 1,000 feet along east side of County Road 59, Briggsdale, Weld County.
Coordinates: 40.7837, -104.5050
(Map it)
Elevation: 1601m.
Environment description: Roadside.
Comment: Very large population of >5,000 plants.
Collector(s):