]> GH barcode-01695995 United States of America Massachusetts Charles River Potamogeton pusillus subsp. tenuissimus (Mertens & Koch) R. R. Haynes & Hellquist (Mertens & Koch) R. R. Haynes & Hellquist 2020-06-11 11:15:47 C. E. Faxon & E. Faxon