| 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 |
|                  Crater Range | Level 6 (Child) |
|                  Growler Mountains | Level 6 (Child) |
|                  Batamote Mountains | Level 6 (Child) |
|                  Sauceda Mountains | Level 6 (Child) |
|                  Pozo Redondo Mountains | Level 6 (Child) |
|                  Bates Mountains | Level 6 (Child) |
|                  Puerto Blanco Mountains | Level 6 (Child) |
|                  Ajo Range | Level 6 (Child) |
|                  Mesquite Mountains | Level 6 (Child) |
|                  Sierra la Angostura | Level 6 (Child) |
|          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) |