Counties:
Alameda
Amador
Butte
Contra Costa
Glenn
Humboldt
Imperial
Kern
Lake
Los Angeles
Mendocino
Monterey
Marin
Nevada
Orange
Riverside
Sacramento
Santa Barbara
San Bernardino
Santa Clara
Santa Cruz
San Diego
San Francisco
San Joaquin
San Luis Obispo
San Mateo
Solano
Sonoma
Ventura
Yolo
Yuba

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