15 August 2005.
Wyoming, United States
Locality: North side of Highway 34, north Sybille Canyon, ~5.5 miles southwest of Platte/Albany County line, Albany County.
Coordinates: 41.7742, -105.3486
(Map it)
Elevation: 1843m.
Georeference protocol: Lat/lon determined by GPS
Environment description: Rocky, gravelly roadside, mostly level, and adjacent meadow. Some brush.
Comment: Population size ~250. H. annuus and H. petiolaris in area.
Collector(s):