25 



„— — - <*-° 9 



BOUNDARIES OF 



10 MARINE AND ESTUARINE 



PROVINCES 



Fig. 7. Ecoregions of the United States after Bailey (1976) with the addition of 10 Marine and Estuarine Provinces proposed in 

 our classification. 



a Domains, Divisions, Provinces, and Sections used on Bailey's (1976) map and described in detail in Bailey (1978). Highland 

 ecoregions are designated M mountain, P plateau, and A altiplano. 



1000 Polar 



1200 Tundra 



1210 Arctic Tundra 

 1220 Bering Tundra 

 M1210 Brooks Range 

 1300 Subarctic 



1310 Yukon Parkland 

 1320 Yukon Forest 

 M1310 Alaska Range 

 2000 Humid Temperate 

 2100 Warm Continental 



2110 Laurentian Mixed Forest 



2111 Spruce-Fir Forest 



2112 Northern Hardwoods-Fir Forest 



2113 Northern Hardwoods Forest 



2114 Northern Hardwoods-Spruce Forest 

 M2110 Columbia Forest 



M2111 Douglas-fir Forest 

 M2112 Cedar-Hemlock- Douglas-fir Forest 

 2200 Hot Continental 



2210 Eastern Deciduous Forest 



2211 Mixed Mesophytic Forest 



2212 Beech-Maple Forest 



2213 Maple- Bass wood Forest + Oak Savanna 



2214 Appalachian Oak Forest 



2215 Oak-Hickory Forest 

 2300 Subtropical 



2310 Outer Coastal Plain Forest 



2311 Beech-Sweetgum- Magnolia- Pine-Oak 



2312 Southern Floodplain Forest 

 2320 Southeastern Mixed Forest 



2000 Humid Temperate 

 2400 Marine 



2410 Willamette-Puget Forest 

 M2410 Pacific Forest (in conterminous U.S.) 



M2411 Sitka Spruee-Cedar-Hemlock Forest 

 M2412 Redwood Forest 

 M2413 Cedar-Hemlock- Douglas-fir Forest 

 M2414 California Mixed Evergreen Forest 

 M2415 Silver fir-Douglas-fir Forest 

 M2410 Pacific Forest (in Alaska) 



2500 Prairie 



2510 Prairie Parkland 



2511 Oak-Hickory -Bluestem Parkland 



2512 Oak + Bluestem Parkland 

 2520 Prairie Brushland 



2521 Mesquite- Buffalo Grass 



2522 Juniper-Oak-Mesquite 



2523 Mesquite-Acacia 

 2530 Tall-Grass Prairie 



2531 Bluestem Prairie 



2532 Wheatgrass-Bluestem-Needlegrass 



2533 Bluestem-Grama Prairie 



2600 Mediterranean (Dry-summer Subtropical) 

 2610 California Grassland 

 M2610 Sierran Forest 

 M2620 California Chaparral 

 3000 Dry 



3100 Steppe 



3110 Great Plains- Shortgrass Prairie 



3111 Grama- Needlegrass-Wheatgrass 



3112 Wheatgrass-Needlegrass 



3113 Grama-Buffalo Grass 



3000 Dry 



3100 Steppe 

 M3110 Rocky Mountain Forest 



M3111 Grand-fir-Douglas-fir Forest 

 M3112 Douglas-fir Forest 

 M3113 Ponderosa Pine- Douglas-fir Forest 

 3120 Palouse Grassland 

 M3120 Upper Gila Mountains Forest 

 3130 Intermountain Sagebrush 



3131 Sagebrush-Wheatgrass 



3132 Lahontan Saltbush-Greasewood 



3133 Great Basin Sagebrush 



3134 Bonneville Saltbush-Greasewood 



3135 Ponderosa Shrub Forest 

 P3130 Colorado Plateau 



P3131 Juniper- Piny on Woodland + Sagebrush 



Saltbush Mosaic 

 P3132 Grama-Galleta Steppe + Juniper- Pinyon 

 Woodland Mosaic 

 3140 Mexican Highland Shrub Steppe 

 A3140 Wyoming Basin 



A3141 Wheatgrass-Needlegrass-Sagebrush 

 A3142 Sagebrush-Wheatgrass 

 3200 Desert 



3210 Chihuahuan Desert 



3211 Grama-Tobosa 



3212 Tarbush-Creosote Bush 

 3220 American Desert 



3221 Creosote Bush 



3222 Creosote Bush-Bur Sage 

 4000 Humid Tropical 



4100 Savanna 



4110 Everglades 

 4200 Rainforest 

 M4210 Hawaiian Islands 



