]> GH barcode-00466778 United States of America Oklahoma Spring Creek north of second dam above the jct. with Pennington Creek, 1 3/4 miles north of Reagan, NW1/4, Sec. 19, T7S, R6E Callitriche heterophylla Pursh Pursh 2020-02-25 20:04:20 C. B. Hellquist & L. Crouch