Counties:
Alpine
Amador
Butte
Calaveras
Colusa
Humboldt
Inyo
Kern
Lake
Los Angeles
Madera
Mendocino
Merced
Monterey
Modoc
Nevada
Orange
Placer
Plumas
Riverside
Sacramento
Santa Barbara
San Bernardino
Santa Clara
Santa Cruz
San Diego
Shasta
Sierra
Siskiyou
San Joaquin
Sonoma
Stanislaus
Tehama
Tuolumne
Ventura
Yolo
Yuba

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