Ecological Systems of the U.S.
The classification system developed by NatureServe and its member natural heritage member programs describes more than 600 terrestrial ecological units that occur in the coterminous United States. Descriptions of many appear here, with others coming soon.
Standard Ecological Units of the United States
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Acadian Coastal Salt Marsh
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Acadian Estuary Marsh
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Acadian Low-Elevation Spruce-Fir-Hardwood Forest
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Acadian Maritime Bog
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Acadian Near-Boreal Spruce Barrens
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Acadian Near-Boreal Spruce Flat
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Acadian-Appalachian Conifer Seepage Forest
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Acadian-Appalachian Montane Spruce-Fir Forest
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Acadian-Appalachian Subalpine Woodland and Heath-Krummholz
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Acadian-North Atlantic Rocky Coast
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Alabama Ketona Glade and Woodland
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Allegheny-Cumberland Dry Oak Forest and Woodland
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Apacherian-Chihuahuan Mesquite Upland Scrub
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Apacherian-Chihuahuan Semi-Desert Grassland and Steppe
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Appalachian (Hemlock)-Northern Hardwood Forest
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Appalachian Shale Barrens
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Arkansas Valley Prairie and Woodland
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Atlantic Coastal Plain Blackwater Stream Floodplain Forest
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Atlantic Coastal Plain Clay-Based Carolina Bay Wetland
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Atlantic Coastal Plain Dry and Dry-Mesic Oak Forest
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Atlantic Coastal Plain Embayed Region Tidal Salt and Brackish Marsh
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Atlantic Coastal Plain Fall-line Sandhills Longleaf Pine Woodland
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Atlantic Coastal Plain Indian River Lagoon Tidal Marsh
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Atlantic Coastal Plain Mesic Hardwood Forest
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Atlantic Coastal Plain Northern Bog
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Atlantic Coastal Plain Northern Salt Pond Marsh
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Atlantic Coastal Plain Peatland Pocosin and Canebrake
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Atlantic Coastal Plain Sandhill Seep
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Atlantic Coastal Plain Small Blackwater River Floodplain Forest
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Atlantic Coastal Plain Streamhead Seepage Swamp, Pocosin, and Baygall
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Atlantic Coastal Plain Upland Longleaf Pine Woodland
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Atlantic Coastal Plain Xeric River Dune
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