18 August 2005.
Wyoming, United States
Locality: South side of College Avenue (Road 212), 1.1 mile east of Exit 7, Interstate 25 (southwest Cheyenne), Laramie County.
Coordinates: 41.1022, -104.8292
(Map it)
Elevation: 1594m.
Georeference protocol: Lat/lon determined by GPS
Environment description: Rocky, sandy, grassy, disturbed roadside ditch. No trees.
Comment: Population size 50-100 plants; past peak flowering. Horses eating H. annuus.
Collector(s):