Arizona
California
- Anza Borrego and Southern Deserts
- Central and Northern California Coast Ranges
- Death Valley
- Inyo and White Mountains
- Joshua Tree
- Lake Tahoe and Northern Sierra
- Mojave Desert
- Sierra Nevada
- Southern California Coast and Mountains
Colorado
Idaho
Lost
Montana
Nevada
- Central Nevada and Elko
- Great Basin and Eastern Nevada
- Southern Nevada and Tonopah Basin
- Western Nevada and the Black Rock Desert