]> GH barcode-01695195 United States of America Michigan Worchester Lake ca. 8 mi NE of Shingleton, Sect. 22, 23, 26, 27, T47N, R16W Potamogeton obtusifolius Mertens & W. D. J. Koch Mertens & W. D. J. Koch 2021-02-15 12:06:19 C. B. Hellquist & R. R. Haynes