North Sonoran Desert Ranges | Level 4 (Parent) |
         Kofa Area | Level 5 (Sibling) |
         Harquahala Area | Level 5 (Sibling) |
         Cabeza Prieta Area | Level 5 (Sibling) |
         Organ Pipe Area | Level 5 (Sibling) |
         Maricopa Area | Level 5 (Sibling) |
         South Phoenix Area | Level 5 (Sibling) |
         Baboquivari Area | Level 5 (Sibling) |
         La Lesna Area | Level 5 (Sibling) |
         San Luis Area | Level 5 (Sibling) |
         West Tucson-Nogales Area | Level 5 |
                 Tucson Mountains | Level 6 (Child) |
                 Sierrita Mountains | Level 6 (Child) |
                 Cerro Colorado Mountains | Level 6 (Child) |
                 Las Guijas Mountains | Level 6 (Child) |
                 Tumacacori Mountains | Level 6 (Child) |
                 Atascosa Mountains | Level 6 (Child) |
                 Sierra Pajarito | Level 6 (Child) |