| Mississippi lowland forest(expression, forest, broadleaf, mixed, temperate) |
| Mojave desert(expression, desert, ecoregion, shrubland) |
| Montana valley and foothill grasslands(expression, grassland, temperate, savanna, shrubland) |
| Muskwa-Slave Lake forest(expression, forest, ecoregion, boreal, taiga) |
| Nebraska Sand Hills mixed grasslands(expression, grassland, temperate, savanna, shrubland) |
| New England-Acadian forest(expression, forest, broadleaf, mixed, temperate) |
| Newfoundland Highland forest(expression, forest, ecoregion, boreal, taiga) |
| North Central Rockies forest(expression, forest, temperate, coniferous, ecoregion) |
| Northeastern coastal forest(expression, forest, broadleaf, mixed, temperate) |
| Northern California coastal forest(expression, forest, temperate, coniferous, ecoregion) |
| Northern Canadian Shield taiga(expression, forest, ecoregion, boreal, taiga) |
| Northern Cordillera forest(expression, forest, ecoregion, boreal, taiga) |
| Northern Lake Superior Taiga(expression, forest, ecoregion, boreal, taiga) |
| Northern Pacific coastal forest(expression, forest, temperate, coniferous, ecoregion) |
| Northern mixed grasslands(expression, grassland, temperate, savanna, shrubland) |
| Northern short grasslands(expression, grassland, temperate, savanna, shrubland) |
| Northern tall grasslands(expression, grassland, temperate, savanna, shrubland) |
| Northern transitional alpine forest(expression, forest, temperate, coniferous, ecoregion) |
| Northwest Territories taiga(expression, forest, ecoregion, boreal, taiga) |
| Ogilvie-MacKenzie alpine tundra(expression, ecoregion, zone, tundra) |