]> GH barcode-01626841 United States of America Oklahoma Spring Creek North of the second dam above the jct. with Pennington Creek, 1 3/4 miles north of Reagan, NW 1/4, Sec. 19, T7S, R6E Myriophyllum heterophyllum Michaux Michaux 2020-05-14 15:25:58 C. B. Hellquist & L. Crouch