a frequency towards the wetter end of the category (more frequently found in wetlands) and the (−) sign indicates a frequency towards the drier end of the category (less frequently found in wetlands). Wetland regions Corps wetland regions are defined as follows: AGCP = Atlantic and Gulf Coastal Plain AW = Arid West CB = Caribbean EMP = Eastern Mountains and Piedmont GP = Great Plains HI = Hawaii MW = Midwest NCNE = Northcentral and Northeast WMVC = Western Mountains, Valleys, and Coast AK = Alaska External links 1988 National List of Vascular Plant Species that Occur in Wetlands 2016 USACE National Wetland Plant List References Wetlands