United States, California, Butte, Cascade Range Foothills. Upper Bidwell Park, Chico; southeast-facing slope ±overlooking Bear Hole on Big Chico Creek, between Middle Trail and Upper Trail. T22N R02E S09 NE1/4 USGS Quadrangle: Richardson Springs 1:24,000
Rocky convex surfaces of annual grassland with scattered blue oak. Thin soil over Tuscan Mudflow volcanic bedrock; with Avena fatua, lots of short Petrorhagia dubia, plus dry Micropus californicus, Navarretia tagetina in bud, Bromus hordeaceus, Selaginella hansenii. Abundant, sometimes dominant or co-dominant with Avena fatua.