Table 2.

The twenty-one Oak Woodland “habitat islands” (or Madrean Sky Island complexes) in the United States.

Mountain ranges connected by contiguous Oak Woodland habitat
1.	Superstition and Pinal Mountains
2.	Santa Teresa Mountains
3.	Pinaleño Mountains
4.	Santa Cataiina Mountains
5.	Rincon Mountains
6.	Sierrita Mountains
7.	Baboquivari and Pozo Verde Mountains
8.	Santa Rita Mountains
9.	Galiuro and Winchester Mountains
10.	Dos Cabezas, Chiricahua, Pedrogosa, and Swisshelm Mountains
11.	Little Dragoon Mountains
12.	Dragoon Mountains
13.	Mule Mountains
14.	Whetstone Mountains
15.	Peloncillo Mountains (AZ and NM)
16.	Atascosa, Pajarito, Las Guijas Mountains (and Sierras Las Avispas and Cíbuta in Sonora)
17.	Huachuca and Patagonia Mountains and Canelo Hills (and Sierra San Antonio in Sonora)
18.	Animas Mountains (NM)
19.	Big Hatchet and Little Hatchel Mountains (NM)
20.	Alamo Hueco Mountains (NM)
21.	San Luis Mountains (NM) (and Sierras San Luis, Las Espuelas, La Caballena, Embudos, and Minitas, in Sonora and Chihuahua)