Counties:
Alpine
Butte
Colusa
El Dorado
Imperial
Inyo
Kern
Lake
Lassen
Los Angeles
Mendocino
Mono
Monterey
Modoc
Mariposa
Napa
Nevada
Placer
Plumas
Riverside
Santa Barbara
San Bernardino
San Benito
Santa Clara
Santa Cruz
San Diego
Shasta
Sierra
Siskiyou
San Luis Obispo
San Mateo
Sonoma
Sutter
Tehama
Trinity
Tuolumne
Ventura

Jepson Bioregions:
Warner Mountains
Klamath Ranges
Cascade Range Foothills
High Cascade Range
High Sierra Nevada
Modoc Plateau