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Dichotomous Keys to Terrestrial Ecological Systems of the U.S.

Dichotomous keys are devices that help users distinguish among ecological classification units by choosing between “couplets” that represent two options. Developed for the multi-agency LANDFIRE project, these keys include ecological systems represent the legend LANDFIRE used to map existing vegetation as well as types that characteristically occur at smaller spatial scales not included in the LANDFIRE legend.

Directory of Keys

• Landfire Map Zone Clustering
• Field Key to Ecological Systems of Map Zone 76
  Aleutian Islands and Alaska Peninsula Alaska, United States
• Dichotomous Field Key to Ecological Systems of Map Zones 67, 68, 69 & 72
  Alaska Arctic, United States
• Field Key to Ecological Systems of Map Zones 55 and 58
  Atlantic Coastal Plain, United States
• Field Key to Ecological Systems of Map Zones 70, 71, 73, 74 and 75
  Boreal and Boreal Transition Regions, Alaska, United States
• Field Key to Ecological Systems of Map Zones 3, 4, 5, & 6
  Target Alliances of California (excluding the Mojave Desert), United States
• Field Key to Ecological Systems and Target Alliances of LandFire Map Zones 27, 33, and 34
  Southwestern Great Plains
• Field Key to Ecological Systems and Target Alliances of Map Zone 20
  Central Montana, United States
• Field Key to Ecological Systems and Target Alliances of LandFire Map Zones 25 and 26
  Northern Chihuahuan Desert
• Field Key to Ecological Systems and Target Alliances of the Colorado Plateau, United States
• Field Key to Ecological Systems and Target Alliances of the Colorado Rocky Mountains, United States
• Field Key to Ecological Systems of Map Zones 47, 48, & 53
  Appalachia Bluegrass Hills, Cumberland Highlands, Appalachia, and Adjacent Areas, United States
• Field Key to Ecological Systems and Target Alliances of the Map Zones 49, 52, 62
  Eastern Till Plains, United States
• Field Key to Ecological Systems of LANDFIRE Map Zones 32 & 35
• Field Key to Ecological Systems of Map Zone 56
  Floridian Coastal Plain, United States
• Field Key to Ecological Systems and Target Alliances of the Map Zones 41, 50, 51
  Great Lakes, United States
• Field Key to Ecological Systems and Target Alliances of the Great Basin, United States
• Field Key to Ecological Systems and Introduced Land Cover Types of Map Zone 79
  Hawai'i, United States
• Field Key to Ecological Systems and Target Alliances of Map Zones 8, 9, & 18
  Columbia Plateau and Parts of the Blue Mountains and Snake River Plain, United States
• Field Key to Ecological Systems of Map Zones 77, 78 and Portions of 75
  North Pacific Maritime Region, Alaska, United States
• Field Key to Ecological Systems of Map Zones 54, 57, 59 60, and 61
  Southern Piedmont, Southern Appalachia, Northeastern Piedmont, Chesapeake Bay, and Northern Appalachia, United States
• Field Key to Ecological Systems of Map Zones 37, 45, 46, 98 and 99
  Gulf Coastal Plains, Mississippi River Alluvial Plain and Adjacent Areas, United States
• Field Key to Ecological Systems and Target Alliances of the Mogollon Rim, United States
• Field Key to Ecological Systems and Target Alliances of the Sonoran and Mojave Deserts
• Field Key to the Ecological Systems of Map Zones 63, 64, 65, and 66
  Finger Lakes, Northeastern Highlands, Connecticut River Basin and Highlands, and The North Woods,United States
• Field Key to Ecological Systems and Target Alliances of the Map Zones 31, 39, 40
  Northern Great Plains, United States
• Field Key to Ecological Systems and Target Alliances of the Northern Rocky Mountains, United States
• Field Key to Ecological Systems and Target Alliances of Map Zones 29 and 30
  Northwestern Great Plains, United States
• Field Key to Ecological Systems of Map Zone 44
  Ozark and Ouachita Mountains and Adjacent Areas, United States
• Field Key to Ecological Systems and Target Alliances of Map Zones 1, 2 & 7
  Pacific Northwest — Coastal Mountains, Puget Lowlands, Willamette Valley, Cascade Mountains of WA and OR and the Modoc Plateau, CA United States
• Field Key to Ecological Systems of LANDFIRE Map Zones 36
• Field Key to Ecological Systems and Target Alliances of the Map Zones 38, 42, 43
  Western Till Plains, United States
• Field Key to Ecological Systems and Target Alliances of the Map Zone 22
  Wyoming Basins, United States