Counties:
Alameda
Amador
Butte
Contra Costa
Colusa
Del Norte
El Dorado
Fresno
Glenn
Humboldt
Imperial
Inyo
Kern
Lake
Los Angeles
Madera
Mendocino
Merced
Monterey
Mariposa
Marin
Napa
Nevada
Orange
Placer
Riverside
Sacramento
Santa Barbara
San Bernardino
Santa Clara
San Diego
San Francisco
Shasta
Siskiyou
San Luis Obispo
San Mateo
Solano
Sonoma
Stanislaus
Sutter
Tehama
Tulare
Ventura
Yolo
Yuba

Jepson Bioregions:
Desert Mountains
White and Inyo Mountains
North Coast
Cascade Range Foothills
Sierra Nevada Foothills
Central Coast
SF Bay
South Coast Ranges
South Coast
Sierra Nevada East
Mojave Desert