Locality: United States, Colorado, Jefferson, Plants of Jefferson County Open Space. Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.6 mi. west on CO Hwy 72 from CO Hwy 93, 1.1 mi. north on Plainview Road, then 870 m. west on a small ridge, 20.0 km. north northwest of the GNIS location of Golden. 39.888424845°N, -105.269557089°W WGS 1984, Elev. 2010 m. Northwest-facing slope above ephemeral stream. Collected by permit: Jefferson County Open Space, 2019, issued 1 March 2019 to T. Schweich.