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Potamogeton amplifolius NRCS. en Potamogeton amplifolius from Edward Voss USDA NRCS Northeast wetland flora Field office guide to plant species Northeast National Technical Center Chester Courtesy of USDA NRCS Wetland Science Institute usda gov imageID poamahp tif Edward Voss Template PDUSGovUSDANRCS Potamogeton amplifolius PDUSGov