Counties:
Alameda
Butte
Calaveras
Contra Costa
El Dorado
Glenn
Humboldt
Imperial
Inyo
Kern
Lassen
Los Angeles
Mendocino
Merced
Mono
Monterey
Modoc
Marin
Napa
Nevada
Orange
Placer
Plumas
Riverside
Sacramento
Santa Barbara
San Bernardino
San Diego
San Francisco
Shasta
Siskiyou
San Luis Obispo
San Mateo
Solano
Sonoma
Stanislaus
Sutter
Tehama
Tulare
Tuolumne
Ventura
Yolo

Jepson Bioregions:
Warner Mountains
White and Inyo Mountains
North Coast
Klamath Ranges
North Coast Ranges
Cascade Range Foothills
High Cascade Range
Sierra Nevada Foothills
High Sierra Nevada
Tehachapi Mtns
Sacramento Valley
San Joaquin
Central Coast
SF Bay
South Coast Ranges
South Coast
Channel Islands
Transverse Ranges
Peninsular Ranges
Modoc Plateau
Sierra Nevada East