]> GH barcode-01695777 United States of America Oklahoma east end of Caddo Lake ca. 1.5 miles west of [Wichita] Mts. Nat'l Wildlife Refuge head-quarters, Sec. 13, T3N, R15W Potamogeton pusillus Linnaeus Linnaeus 2020-04-20 12:09:07 C. B. Hellquist & L. Crouch