| 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 |
|                  Sierra Estrella | Level 6 (Child) |
|                  Maricopa Mountains | Level 6 (Child) |
|                  Sand Tank Mountains | Level 6 (Child) |
|                  Table Top Mountains | Level 6 (Child) |
|                  Vekol Mountains | Level 6 (Child) |
|                  Castle Mountains | Level 6 (Child) |
|                  Sheridan Mountains | Level 6 (Child) |
|                  Sierra Blanca Mountains | Level 6 (Child) |
|                  Brownell Mountains | Level 6 (Child) |
|                  Quijotoa Mountains | Level 6 (Child) |
|          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) |