]> GH barcode-01626992 United States of America Oklahoma ca. 1.0 mile west of Wichita Mountains National Wildlife Refuge Headquarters, R15W, T3N, Sec. 13. Myriophyllum pinnatum (Walter) Britton (Walter) Britton 2020-05-14 16:22:42 C. B. Hellquist & C. E. Hellquist