| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC31 Huntingdonshire, Ramsey | George Taylor | The British Museum | 29/6/1946 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC31 Huntingdonshire, Ramsey | George Taylor | | 29/6/1946 | SLBI |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC31 Huntingdonshire, Upwood | George Taylor | | 29/6/1946 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC31 Huntingdonshire, Woodwalton Fen | Job Edward Lousley | Job Edward Lousley Martin F Gardner & Sabina G Knees | 26/9/1953 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC31 Huntingdonshire, Woodwalton Fen | George Taylor | | 10/7/1949 | BIRM |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC75 Ayrshire, Cambusdoon | George Taylor | | 10/8/1949 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC75 Ayrshire, Dalmellington | George Taylor | | 10/8/1949 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC75 Ayrshire, Dalrymple | George Taylor | The British Museum | 2/8/1949 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC75 Ayrshire, River Doon | George Taylor | George Taylor | 10/8/1949 | E |
+ | Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC75 Ayrshire, Strainton,Burnfoot | George Taylor | British Museum (Natural History) | 4/9/1947 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC75 Ayrshire, Straiton | George Taylor | | 4/9/1947 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC77 Lanarkshire, Carmyle | Robert MacKechnie | Robert MacKechnie | 20/6/1969 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC98 Argyllshire, Oban | Charles Bailey | | 21/7/1885 | ABS |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC102 South Ebudes, Colonsay | George Taylor | | 11/8/1953 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC103 Mid Ebudes, Loch Riaghain | Joan W Clark | | 9/8/1982 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC110 Outer Hebrides, Benbecula | John William Heslop Harrison | John William Heslop Harrison | 25/8/1947 | SLBI |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC110 Outer Hebrides, Loch Fada | G. Wallace T Harding | Loch Survey Herbarium | 24/8/1995 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC110 Outer Hebrides, Loch na Liana Mòire | John William Heslop Harrison | Robert MacKechnie | 23/8/1946 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC110 Outer Hebrides, Loch na Liana Mòire | John William Heslop Harrison | | 23/8/1946 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | GB, VC110 Outer Hebrides, Loch na Liana Mòire | George Taylor | | 22/8/1951 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | Thomas Kirk | Botanical Exchange Club of the Thirsk Natural History Society Mantua And Montferrat | | BON |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | Thomas Kirk | Charles Bailey | 7/9/1853 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | Thomas Kirk | Botanical Exchange Club of the Thirsk Natural History Society Charles Bailey John Ray Hardy | 9/1858 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | D Moore | | 9/1833 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | D Moore | | 9/1853 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | Thomas Kirk | | 7/9/1853 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | Thomas Kirk | | 7/9/1853 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Bealanabrack River | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 9/8/1935 | SLBI |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Lough Corrib | | Thomas Kirk | 9/1858 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Lough Corrib | | Thomas Kirk | 9/1858 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | David Moore | Charles Bailey | 8/1868 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | William Richardson Linton | Botanical Exchange Club of The British Isles Charles Bailey William Richardson Linton | 13/8/1885 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | Edward Francis Linton | Charles Bailey | 13/8/1885 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | Edward Francis Linton | Charles Bailey | 13/8/1885 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | William Richardson Linton | Botanical Exchange Club of The British Isles Charles Bailey William Richardson Linton | 13/8/1885 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | Alban Edward Lomax | Alban Edward Lomax Charles Bailey | 6/8/1886 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | William Andrew Shoolbred | Botanical Exchange Club of The British Isles Charles Bailey William Andrew Shoolbred | 5/7/1895 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | George Claridge Druce | Botanical Exchange Club of The British Isles Charles Bailey George Claridge Druce | 9/1906 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | | Thomas Kirk | 9/1858 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | | Botanical Exchange Club of The British Isles George Claridge Druce | 9/1906 | ABS |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | George Claridge Druce | George Claridge Druce | 9/1907 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley William Richardson Linton | 13/8/1885 | BIRM |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | Edward Francis Linton William Richardson Linton | Botanical Exchange Club of The British Isles William Richardson Linton | 8/1885 | ABS |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | Edward Francis Linton | Botanical Exchange Club of The British Isles William Hadden Beeby | 13/8/1885 | SLBI |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | | Thomas Kirk | 9/1838 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | William Arthur Sledge | Botanical Exchange Club of The British Isles William Arthur Sledge | 9/8/1935 | SLBI |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | William Arthur Sledge | Botanical Exchange Club of The British Isles William Arthur Sledge | 9/9/1935 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, Galway, Lough Corrib | Koch | Allan Octavian Hume Frederick Townsend William Borrer | | SLBI |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH39 Co. Antrim, Lough Neagh | D Moore | | | E |