]> GH barcode-01688102 United States of America Michigan mouth of Black Mallard River (Carp Ck.), 1 mi S of Grace, E of US Rt 23, Sect. 1, T36N, R2E Potamogeton hillii Morong Morong 2021-02-11 18:14:06 C. B. Hellquist & R. R. Haynes