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Wetland Indicator Status

On June 1, 2012, the 2012 National Wetland Plant List replaced the 1988 U.S. Fish and Wildlife Service's National list of plant species that occur in wetlands (U.S. Fish & Wildlife Service Biological Report 88 (24)) for all wetland determinations and delineations performed for Section 404 of the Clean Water Act, the Swampbuster provisions of the Food Security Act, and the National Wetland Inventory.  This list was developed by the U.S. Army Corps of Engineers, the Fish and Wildlife Service (FWS), the Environmental Protection Agency, and the Natural Resources Conservation Service using taxonomic and distribution data from the Biota of North America program (BONAP) and legacy information from the FWS, and is directed by the Corps of Engineers.  The 2012 list included changes in the names of species, the recognition of new species, changes in wetland regions, and changes in the wetland indicator statuses of species.  This list was updated again on July 11, 2013, and April 3, 2014.  These updates included more changes in the names of species, the addition of new species, and the removal of species that were listed as Upland in all regions.  For further information, see the official website of the National Wetland Plant List.


Note: PLANTS does not accept a few of the species names on the National Wetland Plant List.  The species names in the NWPL must be used by those performing federal wetland delineations.


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Scientific names and regional wetland indicators for the PLANTS 2014 National Wetland Plant List are taken from the official version of the National Wetland Plant List:

Lichvar, R.W. 2014. The National Wetland Plant List: 2014 wetland ratings. Phytoneuron 2014-41: 1-42. (See also the official website of the National Wetland Plant List.)

Definitions of indicator categories are taken from:

Lichvar, R.W., N.C. Melvin, M.L. Butterwick, and W.N. Kirchner. 2012. National Wetland Plant List indicator rating definitions. U.S. Army Corps of Engineers, Engineer Research and Development Center, Cold Regions Research and Engineering Laboratory ERDC/CRREL TR-12-1.

Definitions of wetland regions are taken from:

U.S. Army Corps of Engineers. 2007. Regional supplement to the Corps of Engineers Wetland Delineation Manual: Alaska Region (Version 2.0).  U.S. Army Corps of Engineers, Engineer Research and Development Center, Environmental Laboratory ERDC/EL TR-07-24.

U.S. Army Corps of Engineers. 2008. Regional supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0).  U.S. Army Corps of Engineers, Engineer Research and Development Center, Environmental Laboratory ERDC/EL TR-08-28.

U.S. Army Corps of Engineers. 2010. Regional supplement to the Corps of Engineers Wetland Delineation Manual: Atlantic and Gulf Coastal Plain Region (Version 2.0).  U.S. Army Corps of Engineers, Engineer Research and Development Center, Environmental Laboratory ERDC/EL TR-10-20.

U.S. Army Corps of Engineers. 2011. Regional supplement to the Corps of Engineers Wetland Delineation Manual: Caribbean Islands Region (Version 2.0).  U.S. Army Corps of Engineers, Engineer Research and Development Center, Environmental Laboratory ERDC/EL TR-11-4.

U.S. Army Corps of Engineers. 2010. Interim regional supplement to the Corps of Engineers Wetland Delineation Manual: Eastern Mountains and Piedmont Region.  U.S. Army Corps of Engineers, Engineer Research and Development Center, Environmental Laboratory ERDC/EL TR-10-9.

U.S. Army Corps of Engineers. 2010. Regional supplement to the Corps of Engineers Wetland Delineation Manual: Great Plains Region (Version 2.0).  U.S. Army Corps of Engineers, Engineer Research and Development Center, Environmental Laboratory ERDC/EL TR-10-1.

U.S. Army Corps of Engineers. 2010. Regional supplement to the Corps of Engineers Wetland Delineation Manual: Hawai'i and Pacific Islands Region.  U.S. Army Corps of Engineers, Engineer Research and Development Center, Environmental Laboratory ERDC/EL TR-10-6.

U.S. Army Corps of Engineers. 2010. Regional supplement to the Corps of Engineers Wetland Delineation Manual: Midwest Region (Version 2.0).  U.S. Army Corps of Engineers, Engineer Research and Development Center, Environmental Laboratory ERDC/EL TR-10-16.

U.S. Army Corps of Engineers. 2009. Regional supplement to the Corps of Engineers Wetland Delineation Manual: Northcentral and Northeast Region.  U.S. Army Corps of Engineers, Engineer Research and Development Center, Environmental Laboratory ERDC/EL TR-09-19.

U.S. Army Corps of Engineers. 2010. Regional supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (Version 2.0).  U.S. Army Corps of Engineers, Engineer Research and Development Center, Environmental Laboratory ERDC/EL TR-10-3.

Indicator categories

Indicator Code

Indicator Status

Designation

Comment

OBL

Obligate Wetland

Hydrophyte

Almost always occur in wetlands

FACW

Facultative Wetland

Hydrophyte

Usually occur in wetlands, but may occur in non-wetlands

FAC

Facultative

Hydrophyte

Occur in wetlands and non-wetlands

FACU

Facultative Upland

Nonhydrophyte

Usually occur in non-wetlands, but may occur in wetlands

UPL

Obligate Upland

Nonhydrophyte

Almost never occur in wetlands

These indicator statuses are used to designate a plant species' preference for occurrence in a wetland or upland.  The information supporting the indicator status assignments for the 1988 wetland list was qualitative, not quantitative.  To better reflect the supporting information, the new category definitions are based on qualitative descriptions.

Regions and subregions

The wetland regions, the states wholly or partly in each region, and the definition of each region are listed below.  Most of the regions are now defined by the boundaries of Land Resource Regions (LRRs) and Major Land Resource Areas (MLRAs) recognized by the Natural Resources Conservation Service.  LRRs are groups of MLRAs.  For the boundaries of LRRs and MLRAs, see the NRCS Major Land Resource Area (MLRA) page.

Region

Geographic areas in region

Definition of region

Alaska

AK

State of Alaska

Arid West

AZ, CA, CO, ID, MT, NV, NM, OR, TX, UT, WA, WY

LRRs B, C, LRR D except MLRAs 22A, 22B, 39, and except embedded mountains above and including the ponderosa pine zone

Atlantic and Gulf Coastal Plain

AL, AR, DC, DE, FL, GA, IL, KY, LA, MD, MS, MO, NC, NJ, OK, PA, SC, TN, TX, VA

LRR O, LRR P except MLRA 136, MLRA 149A of LRR S, LRRs T, U

Caribbean

PR (Puerto Rico), VI (U.S. Virgin Islands)

LRR Z

Eastern Mountains and Piedmont

AL, AR, DC, DE, GA, IL, IN, KS, KY, MD, MO, NC, NJ, NY, OH, OK, PA, SC, TN, VA, WV

LRR N, MLRA 136 in LRR P, MLRAs 147, 148 in LRR S

Great Plains

CO, KS, MN, MT, NE, NM, ND, OK, SD, TX, WY

LRRs F, G except parts of MLRA 62 above lower limit of ponderosa pine zone, H, I, J

Hawaii and Pacific Islands

HI, GU (Guam), MP (Northern Mariana Islands), AS (American Samoa)

LRR V, portions of LRR Q

Midwest

IL, IN, IA, KS, KY, MI, MN, MO, NE, ND, OK, OH, SD, WI

LRR M

Northcentral and Northeast

CT, IL, IN, MA, ME, MI, MN, NH, NJ, NY, OH, PA, RI, VT, WI

LRRs K, L, R, MLRA 149B in LRR S

Western Mountains, Valleys, and Coast

AZ, CA, CO, ID, MT, NV, NM, OR, SD, UT, WA, WY

LRRs A, E, MLRAs 22A, 22B, 39 of LRR D, MLRA 62 of LRR G, other mountains above and including the ponderosa pine zone

The Alaska, Atlantic and Gulf Coastal Plain, Hawaii and Pacific Islands, and Northcentral and Northeast regions each have subregions.  In these subregions, the wetland indicator status of several plant species differs from the status of the same species in the rest of the region.  Alaska has 14 subregions, and the Atlantic and Gulf Coastal Plain region, the Hawaii and Pacific Islands region, and the Northcentral and Northeast region have one subregion each.  For maps of these subregions, see the official website of the National Wetland Plant List (http://wetland_plants.usace.army.mil).

The table below lists each subregion, the region to which it belongs, and the states wholly or partly included in each subregion.

Subregion

Region

Geographic areas in subregion

Alaska Interior

Alaska

AK

Arctic Coastal Plain

Alaska

AK

Cook Inlet Lowlands

Alaska

AK

Copper River Basin

Alaska

AK

Interior Alaska Highlands

Alaska

AK

Interior Alaska Lowlands

Alaska

AK

Interior Alaska Mountains

Alaska

AK

Interior Brooks Range

Alaska

AK

Northern Brooks Range Mountains

Alaska

AK

Northern Seward Peninsula-Selawik Lowlands

Alaska

AK

Pebble, Donlin, Aniak

Alaska

AK

Seward Peninsula Highlands

Alaska

AK

Upper Kobuk and Koyukuk Hills and Valleys

Alaska

AK

Western Brooks Range Mountains, Foothills, and Valleys

Alaska

AK

Western Gulf Coast

Atlantic and Gulf Coastal Plain

AR, IL, KY, LA, MS, MO, OK, TN, TX

South Pacific Islands

Hawaii and Pacific Islands

GU (Guam), MP (Northern Mariana Islands), AS (American Samoa)

Northcentral Great Lakes

Northcentral and Northeast

IL, IN, MI, MN, OH, WI

Additional Information

For additional information, see the official website of the National Wetland Plant List (http://wetland_plants.usace.army.mil).