]> GH barcode-01564079 United States of America Texas Little Aguja Creek, Little Aguja Canyon, downstream 200 yds from Natural Bridge, Davis Mts. Preserve, Nature Conservancy Potamogeton clystocarpus Fernald Fernald 2023-01-31 13:08:42 C. B. Hellquist, E. Schneider & J. Whittall