| Aleutian/bering Sea Islands |
| Altos De Chiapas |
| Appalachian Mountains |
| Archipielago De Revillagigedo |
| Arctic Plains and Mountains |
| Arrecife Alacranes |
| Atlantic Northern Forest |
| Badlands and Prairies |
| Boreal Hardwood Transition |
| Boreal Softwood Shield |
| Boreal Taiga Plains |
| Central Hardwoods |
| Central Mixed Grass Prairie |
| Chihuahuan Desert |
| Coastal California |
| Cuenca Del Rio Balsas |
| Depresiones Intermontanas |
| Desierto De Baja California |
| Eastern Tallgrass Prairie |
| Edwards Plateau |
| Eje Neovolcanico Transversal |
| Great Basin |
| Great Lakes |
| Gulf Coastal Prairie |
| Isla Cozumel |
| Isla Guadalupe |
| Islas Del Golfo De California |
| Islas Marias |
| Los Tuxtlas |
| Lower Great Lakes/ St. Lawrence Plain |
| Marismas Nacionales |
| Mississippi Alluvial Valley |
| New England/mid-atlantic Coast |
| Northern Pacific Rainforest |
| Northern Rockies |
| Northwestern Interior Forest |
| Not Rated |
| Oaks and Prairies |
| Pantanos De Centla-laguna De Terminos |
| Peninsular Florida |
| Piedmont |
| Planicie Costera Del Soconusco |
| Planicie Costera Y Lomerios Del Pacifico Sur |
| Planicie Costera Y Lomerios Humedos Del Golfo De Mexico |
| Planicie Costera Y Lomerios Secos Del Golfo De Mexico |
| Planicie Costera, Lomerios Y Canones De Occidente |
| Planicie De La Peninsula De Yucatan |
| Planicie Noroccidental De Yucatan |
| Prairie Hardwood Transition |
| Prairie Potholes |
| Shortgrass Prairie |
| Sierra Madre De Chiapas |
| Sierra Madre Del Sur |
| Sierra Madre Occidental |
| Sierra Madre Oriental |
| Sierra Nevada |
| Sierra Norte De Puebla-oaxaca |
| Sierras De Baja California |
| Sierras Y Planicies Del Cabo |
| Sonoran and Mojave Deserts |
| Southeastern Coastal Plain |
| Southern Rockies/colorado Plateau |
| Sur Del Altiplano Mexicano |
| Taiga Shield and Hudson Plains |
| Tamaulipan Brushlands |
| Valle Tehuacan-cuicatlan |
| West Gulf Coastal Plain/ouachitas |
| Western Alaska |
| <all other values> |