]> GH barcode-01746009 United States of America Michigan small backwater on W side of Upper Black River ca. 11.3 km N of Tower, NE 1/4 Sect. 34, T36N, R1E Potamogeton pusillus subsp. tenuissimus (Mertens & Koch) R. R. Haynes & Hellquist (Mertens & Koch) R. R. Haynes & Hellquist 2021-02-16 19:12:10 C. B. Hellquist & R. R. Haynes