* The Great Plains: This vast region stretches from Canada to Mexico and is characterized by its rolling hills and fertile soil. The Great Plains are home to a variety of grasses, including buffalo grass, grama grass, and wheatgrass.
* The Palouse: This region of eastern Washington and Oregon is known for its rolling hills and fertile soil. The Palouse is home to a variety of grasses, including bunchgrass, bluegrass, and fescue.
* The California Prairie: This region of California is characterized by its Mediterranean climate and its mix of grasses and wildflowers. The California Prairie is home to a variety of grasses, including purple needlegrass, California oatgrass, and wild rye.
Forests
* The Pacific Northwest Rainforests: These rainforests are located along the Pacific coast of the United States and Canada. They are characterized by their tall trees, lush understory, and abundant rainfall. The Pacific Northwest Rainforests are home to a variety of trees, including Douglas fir, Sitka spruce, and Western hemlock.
* The Rocky Mountain Forests: These forests are located in the Rocky Mountains of the United States and Canada. They are characterized by their towering pines, spruce, and fir trees. The Rocky Mountain Forests are home to a variety of animals, including elk, moose, and bears.
* The Eastern Deciduous Forests: These forests are located in the eastern United States. They are characterized by their broadleaf trees, which lose their leaves in the fall. The Eastern Deciduous Forests are home to a variety of trees, including oak, maple, and hickory.
Deserts
* The Sonoran Desert: This desert is located in the southwestern United States and Mexico. It is characterized by its hot, dry climate and its unique plant and animal life. The Sonoran Desert is home to a variety of cacti, including the saguaro cactus, the prickly pear cactus, and the cholla cactus.
* The Mojave Desert: This desert is located in the southwestern United States. It is characterized by its hot, dry climate and its sparse vegetation. The Mojave Desert is home to a variety of plants, including creosote bush, Joshua trees, and yuccas.
* The Great Basin Desert: This desert is located in the western United States. It is characterized by its cold, dry climate and its unique plant and animal life. The Great Basin Desert is home to a variety of plants, including sagebrush, rabbitbrush, and greasewood.
Tundra
* The Arctic Tundra: This tundra region is located in the northernmost part of Alaska. It is characterized by its cold, dry climate and its permafrost. The Arctic Tundra is home to a variety of plants, including mosses, lichens, and flowering plants.
* The Alpine Tundra: This tundra region is located in the high mountains of the western United States. It is characterized by its cold, dry climate and its short growing season. The Alpine Tundra is home to a variety of plants, including mosses, lichens, and flowering plants.