18 August 2005.
Colorado, United States
Locality: Scattered in and along dry Owl Creek, 0.5 mile north and south of ford, ~1.4 miles northwest of ARS Central Plains Experiment Range Headquarters, Pawnee National Grasslands, off GR 37, Weld County.
Coordinates: 40.8528, -104.7372
(Map it)
Elevation: 1664m.
Georeference protocol: Lat/lon determined by GPS
Environment description: Rocky, sandy, dry creek bed, bottom and some steep creek banks. Few random cottonwood.
Comment: Population size 107 (sampled all); past peak flowering. H. petiolaris in area.
Collector(s):