United States, California, Butte, Cascade Range Foothills. East edge of City of Chico; south side of Humboldt Road 1.4 km northeast of Bruce Road. T22N R02E S20 SE1/4 USGS Quadrangle: Chico 1:24,000
Somewhat disturbed open blue oak woodland between paved road and the rock wall. Shallow rocky soil over volcanic bedrock; gentle westerly slope, with the taller E. brachycarpum.