Aesculus californica (Spach) Nutt.

A. californica occurs below 1200 m in elvation within the the Klamath and Coast Ranges from Siskiyou County south to Los Angeles County, and in the Cascade Range and the foothills of the Sierra Nevada, it is found from from Shasta County south to Kern County. Less commonly it occurs in the Central Valley in Colusa, Yolo and Stanislaus Counties. California Buckeye is found in the following diverse vegetative associations: chaparral, montane chaparral, California mixed oak forest, California mixed evergreen forest, Ponderosa shrub forest, cypress forest, redwood forest, mixed conifer forest and silver fir/douglas fir forest. A. californica primarily occurs on sandy, sandy-loam, or gravelly-loam soils.