]> GH barcode-01564695 United States of America Maryland at Rte 4 bridge Patuxent River, Wayson's Corner nr Mill Creek. Potamogeton epihydrus var. nuttallii (Chamisso & Schlechtendal) Fernald (Chamisso & Schlechtendal) Fernald 2021-02-25 15:05:50 S. R. Hill