]> GH barcode-00306071 United States of America Massachusetts [Middlesex Fells Reservation] Spot Pond Potamogeton pusillus subsp. tenuissimus (Mertens & Koch) R. R. Haynes & Hellquist (Mertens & Koch) R. R. Haynes & Hellquist 2010-08-16 16:39:25 C. E. Faxon & E. Faxon