United States, California, Butte, On banks of roadcut and at sides of road, ca. 2 mi sse of Stirling City. T23N R04E S09 NE corner USGS Quadrangle: Paradise East 1:24,000
39.868333 -121.522222 +-805m. NAD83
T23N R04E S09 NE corner; 39§ 52m 6s N; 121§ 31m 20s W
945 meters
3100ft.
Growing on volcanic mudflow substrate; on banks of roadcut and at sides of road. With: Eriophyllum lanatum, Penstemon laetus, Clarkia rhomboidea, Eriogonum nudum, Ceanothus integerrimus.
Annotation label: Voucher specimen for "Studies in the Reproductive Biology of Mustard Species Occurring in Butte County, California"--R.E. Preston; Summer, 1983.