California Polytechnic State University, Robert F. Hoover Herbarium (OBI)
Polygonum douglasii Greene
United States, Colorado, Jefferson, High plains above Rocky Flats, west 1.7 mi. on CO Hwy 72 from CO Hwy 93, generally north 1.0 mi. on Plainview Road, then 400 m. east to a small break in slope, 19.6 km. north northeast of the GNIS location of Golden.
39.88803159 -105.2573048 WGS 1984
1926 meters (6317ft)
In a thicket, primarily of Prunus virginiana, along a break in slope.
Also collected in these thickets: Silene latifolia, Cynoglossum officinale, and Arctium minus.