]> GH barcode-01572834 United States of America Michigan Black Mallard River (Carp Ck.) 1.6 km south of Grace, east of Rt. 23 at Lake Huron, Sect. 1, T36N, R2E Potamogeton gramineus Linnaeus Linnaeus 2021-02-11 13:18:12 C. B. Hellquist & R. R. Haynes