Counties:
Alameda
Butte
Contra Costa
Colusa
Fresno
Glenn
Inyo
Kern
Los Angeles
Merced
Monterey
Marin
Napa
Orange
Riverside
Santa Barbara
San Bernardino
San Benito
Santa Clara
Santa Cruz
San Diego
San Francisco
San Joaquin
San Luis Obispo
San Mateo
Solano
Sonoma
Stanislaus
Sutter
Tehama
Tulare
Tuolumne
Ventura
Yolo

Jepson Bioregions:
Desert Mountains
White and Inyo Mountains
North Coast
North Coast Ranges
Sierra Nevada Foothills
Tehachapi Mtns
Sacramento Valley
San Joaquin
Central Coast
SF Bay
South Coast Ranges
South Coast
Channel Islands
Transverse Ranges
Peninsular Ranges
Sierra Nevada East
Mojave Desert