]> GH barcode-01572439 United States of America Michigan Hook Point on the S.E. end of Douglas Lake, near the U. of Michigan Biological Station, ca. 3 mi. W. of I-75 along the Riggsville Rd (one to Pellston). Potamogeton friesii Ruprecht Ruprecht 2021-02-11 08:11:25 R. R. Haynes