]> NEBC barcode-00549400 United States of America Massachusetts Gulf of Maine Coastal Plain Ecoregion, Ipswich River Watershed. South end of Martins Pond, beach at Clarke Parke, GPS 42.5913N, 71.1244W Potamogeton diversifolius Rafinesque Rafinesque 2015-06-05 09:01:52 W. T. Kittredge