]> GH barcode-01732622 United States of America Michigan Black Mallard River (Carp Creek) 1.6 km S of Grace between Rt. 23 and Lake Huron, Sect. 1, T36N, R2E Stuckenia filiformis subsp. occidentalis (J.W. Robbins) Haynes, D.H. Les & M. Kral (J.W. Robbins) Haynes, D.H. Les & M. Kral 2021-03-06 05:54:40 C. B. Hellquist & R. R. Haynes