Counties:
Alpine
Butte
Calaveras
El Dorado
Fresno
Glenn
Humboldt
Inyo
Lassen
Madera
Mono
Modoc
Mariposa
Nevada
Placer
Plumas
San Bernardino
Shasta
Sierra
Siskiyou
Tehama
Trinity
Tulare
Tuolumne

Jepson Bioregions:
Warner Mountains
Klamath Ranges
North Coast Ranges
High Cascade Range
Sierra Nevada Foothills
High Sierra Nevada
Tehachapi Mtns
Transverse Ranges
Peninsular Ranges
Modoc Plateau