| North Sonoran Desert Ranges | Level 4 (Parent) |
|          Kofa Area | Level 5 (Sibling) |
|          Harquahala Area | Level 5 |
|                  Buckskin Mountains | Level 6 (Child) |
|                  Harcuvar Mountains | Level 6 (Child) |
|                  Granite Wash Mountains | Level 6 (Child) |
|                  Little Harquahala Mountains | Level 6 (Child) |
|                  Harquahala Mountains | Level 6 (Child) |
|                  Vulture Mountains | Level 6 (Child) |
|                  Big Horn Mountains | Level 6 (Child) |
|                  Belmont Mountains | Level 6 (Child) |
|                  Eagletail Mountains | Level 6 (Child) |
|                  Gila Bend Mountains | Level 6 (Child) |
|          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 (Sibling) |