United States, California, Butte, Sacramento Valley. Along old rock wall on south side of Hum-boldt Road 0.3 km east of Bruce Road, across from rehabbed and covered area of old dump site. T22N R02E S29 NW1/4 USGS Quadrangle: Chico 1:24,000
39.739444 -121.783889 WGS 1984
T22N R02E S29 NW1/4; 39§ 44m 22s N; 121§ 47m 2s W
86 meters (282ft)
Open annual grassland on thin soil over Tuscan Mudflow volcanic bedrock. Rock wall also with Silybum marianum, Amsinckia intermedia, Centaurea solstitialis ro-settes, Anthriscus caucalis. Plants very showy with bright yellow flowers when in full flower, less showy now.