Counties:
Alpine
Amador
Butte
Calaveras
El Dorado
Fresno
Glenn
Humboldt
Inyo
Kings
Kern
Lake
Lassen
Los Angeles
Madera
Mendocino
Merced
Mono
Monterey
Modoc
Mariposa
Napa
Nevada
Orange
Placer
Plumas
Riverside
Sacramento
Santa Barbara
San Bernardino
San Benito
San Diego
Shasta
Sierra
Siskiyou
San Joaquin
San Luis Obispo
Stanislaus
Sutter
Tehama
Trinity
Tulare
Tuolumne
Ventura

Jepson Bioregions:
Desert Mountains
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
Mojave Desert
Sonoran Desert