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Potamogeton diversifolius NRCS. en Potamogeton diversifolius from Robert Mohlenbrock USDA NRCS Northeast wetland flora Field office guide to plant species Northeast National Technical Center Chester Courtesy of USDA NRCS Wetland Science Institute Cropped usda gov imageID podiahp tif Robert Mohlenbrock Template PDUSGovUSDANRCS