16 August 2005.
Wyoming, United States
Locality: Both sides of Silver Springs Road (Highway 54), 9.2 miles south of Highway 18/20, southwest of Lusk, Niobrara County.
Coordinates: 42.6400, -104.5253
(Map it)
Elevation: 1722m.
Georeference protocol: Lat/lon determined by GPS
Environment description: Roadside grassy meadow; open pine and brush in the distance.
Number of plants sampled: 50
Associated species: Helianthus annuus.
Comment: Population size approximately 500. Plants mostly past flowering.
Collector(s):