16 August 2005.
Wyoming, United States
Locality: Both sides of Highway 270, Webb Canyon, ~3.5 miles north of Hartville, Platte County.
Coordinates: 42.3661, -104.7106
(Map it)
Elevation: 1572m.
Georeference protocol: Lat/lon determined by GPS
Environment description: Rocky, sandy, roadside, some slope, some flat.
Comment: Population size 250. H. annuus and H. petiolaris present.
Collector(s):