| <all other values> |
| 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 |
| Gulf Coastal Prairie |
| Isla Conzumel |
| 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 |
| Oaks and Prairies |
| Pantanos De Centla-Laguna De Terminos |
| Peninsular Florida |
| Piedmont |
| Plancie de la Peninsula de Yucatan |
| Planice Coastera Del Soconusco |
| Planice Coastera y Lomerios Del Golfo De Mexico |
| Planice Coastera y Lomerios Del Pacifico Sur |
| Planice Coastera y Lomerios Secos Del Golfo De Mexico |
| Planice Coastera, Lomerios y Canones De Occidente |
| Planice Noroccidental de Yucatan |
| Prairie Hardwood Tansition |
| Prairie Potholes |
| Shortgrass Prairie |
| Sierra Madre Occidental |
| Sierra Madre Oriental |
| Sierra Madre de Chiapas |
| Sierra Madre del Sur |
| 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> |
| 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 |
| Gulf Coastal Prairie |
| Isla Conzumel |
| 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 |
| Oaks and Prairies |
| Pantanos De Centla-Laguna De Terminos |
| Peninsular Florida |
| Piedmont |
| Plancie de la Peninsula de Yucatan |
| Planice Coastera Del Soconusco |
| Planice Coastera y Lomerios Del Golfo De Mexico |
| Planice Coastera y Lomerios Del Pacifico Sur |
| Planice Coastera y Lomerios Secos Del Golfo De Mexico |
| Planice Coastera, Lomerios y Canones De Occidente |
| Planice Noroccidental de Yucatan |
| Prairie Hardwood Tansition |
| Prairie Potholes |
| Shortgrass Prairie |
| Sierra Madre Occidental |
| Sierra Madre Oriental |
| Sierra Madre de Chiapas |
| Sierra Madre del Sur |
| 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> |
| 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 |
| Gulf Coastal Prairie |
| Isla Conzumel |
| 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 |
| Oaks and Prairies |
| Pantanos De Centla-Laguna De Terminos |
| Peninsular Florida |
| Piedmont |
| Plancie de la Peninsula de Yucatan |
| Planice Coastera Del Soconusco |
| Planice Coastera y Lomerios Del Golfo De Mexico |
| Planice Coastera y Lomerios Del Pacifico Sur |
| Planice Coastera y Lomerios Secos Del Golfo De Mexico |
| Planice Coastera, Lomerios y Canones De Occidente |
| Planice Noroccidental de Yucatan |
| Prairie Hardwood Tansition |
| Prairie Potholes |
| Shortgrass Prairie |
| Sierra Madre Occidental |
| Sierra Madre Oriental |
| Sierra Madre de Chiapas |
| Sierra Madre del Sur |
| 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 |