]> GH barcode-01688977 United States of America Oklahoma eastern end of Caddo Lake ca. 1.5 miles west of Wichita Mts. Nat'l Wildlife Refuge headquarters, Sec. 13, T3N, R15W Potamogeton nodosus Poiret Poiret 2020-04-16 14:53:00 C. B. Hellquist & L. Crouch