]> GH barcode-01688933 United States of America Oklahoma Rock Creek ca. 1 1/2 miles east of Dougherty along the Dougherty-Nebo Road, R3E, T2S, Sec. 7 Potamogeton nodosus Poiret Poiret 2020-04-15 12:11:11 C. B. Hellquist & J. Holt