9

Great plains

9.6

Semi-arid great plains of Texas &Tamaulipas

10

North American deserts

10.2

Hot deserts

11

California mediterranean

11.1

California mediterranean

12

Semi-arid southern uplands

12.1

Foothills of the Sierra Madre Occidental

12.2

Mexican altiplano

13

Temperate mountains

13.2

Sierra Madre Occidental

13.3

Sierra Madre Oriental

13.4

Neovolcanic Transversal system

13.5

Sierra Madre del Sur

13.6

Central American Sierra Madre & Highlands of Chiapas

14

Dry tropical forest

14.1

Coastal plains & dry ridges of the gulf of Mexico

14.2

North Western Plains of the Yucatan Peninsula

14.3

Western coastal plains, ridges y canyons

14.4

Inter-montane depressions

14.5

Coastal plains & ridges of the  Southern pacific

14.6

Plains and mountains of the cape

15

Tropical rain forest

15.1

Coastal plains & ridges of the gulf of Mexico

15.2

Plains & ridges of the Yucatán peninsula

15.3

Sierra de los Tuxtlas

15.5

Western plains & ridges

15.6

Coastal plain & ridges of Soconusco