| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea,Blackbush Drain | Alfred Fryer | Alfred Fryer Charles Bailey | 16/8/1895 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea,Blackbush Drain | Alfred Fryer | Alfred Fryer Charles Bailey | 22/6/1895 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea,Blackbush Drain | Alfred Fryer | Alfred Fryer Charles Bailey | 25/6/1895 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea,Blackbush Drain | Alfred Fryer | Alfred Fryer Charles Bailey | 22/6/1895 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea,Blackbush Drain | Alfred Fryer | Alfred Fryer Charles Bailey | 22/6/1895 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea,Blackbush Drain | Alfred Fryer | Botanical Exchange Club of The British Isles Allan Octavian Hume Frederick Townsend | 15/9/1894 | SLBI |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea,Blackbush Drain | Alfred Fryer | | 18/9/1894 | SLBI |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea,Blackbush Drain | Alfred Fryer | | 18/9/1894 | SLBI |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC31 Huntingdonshire, Ramsey | Alfred Fryer Edward Walter Hunnybun | Allan Octavian Hume | 7/8/1907 | SLBI |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC32 Northamptonshire, Borough Fen | | Botanical Exchange Club of The British Isles Augustin Ley George Claridge Druce | 7/1910 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC32 Northamptonshire, Peterborough, Borough Fen | George Claridge Druce | Druce Herbarium, Oxford Charles Bailey | 1/7/1910 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC54 North Lincolnshire, Belton | George Taylor | The British Museum | 2/8/1941 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC54 North Lincolnshire, Belton | George Taylor | Job Edward Lousley | 5/6/1944 | SLBI |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC56 Nottinghamshire, Misson | J Brown | The British Museum | 7/5/1949 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC58 Cheshire, Hale Moss | | Charles Bailey | 7/1859 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC64 Mid-west Yorkshire, Malham Tarn | George Taylor | The British Museum | 29/7/1949 | SLBI |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC64 Mid-west Yorkshire, Malham Tarn | James B Phipps | James B Phipps | 13/7/1954 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC64 Mid-west Yorkshire, Malham Tarn | James B Phipps | James B Phipps | 13/7/1954 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC64 Mid-west Yorkshire, Malham Tarn | Job Edward Lousley | Job Edward Lousley | 22/5/1935 | SLBI |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC67 South Northumberland, Riding | George Taylor | The British Museum | 29/7/1944 | SLBI |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC69 Westmorland, Eamont Bridge | Catherine Muriel Rob | | 18/9/1949 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC69 Westmorland, Haverthwaite | William Harold Pearsall | Douglas Montague Heath Frederick Robinson | 17/7/1919 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC69 Westmorland, Low Wood | William Harold Pearsall | Botanical Exchange Club of The British Isles William Harold Pearsall | 16/8/1913 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC69 Westmorland, Ullswater | William Harold Pearsall | | 12/8/1919 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC69,VC70, Eamont Bridge | Douglas Montague Heath Thomas Jackson Foggitt | Douglas Montague Heath | 20/7/1938 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC80 Roxburghshire, Roxburgh Castle, Kelso | Ernest Hutmacher | | 7/1876 | BON |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC80 Roxburghshire, Sprouston | Andrew Brotherston | | 8/1875 | BON |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC81 Berwickshire, Coldingham | John Thomas Irvine Boswell-Syme | | 8/1847 | BON |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC81 Berwickshire, Coldingham | John Thomas Irvine Boswell-Syme | Botanical Society of Edinburgh Fletcher | 8/1848 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC88 Mid Perthshire, Perth | John Thomas Irvine Boswell-Syme | Charles Bailey | 9/1869 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC88 Mid Perthshire, Perth Bridge | John Thomas Irvine Boswell-Syme | | 9/1869 | BON |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC88 Mid Perthshire, River Tay | John Sim | Charles Cardale Babington George Stephen West | 4/7/1865 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC88 Mid Perthshire, River Tay | John Sim | Charles Bailey | 7/1865 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC88 Mid Perthshire, River Tay | John Thomas Irvine Boswell-Syme | William Hadden Beeby William R Hayward | 7/1870 | SLBI |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC88 Mid Perthshire, River Tay | John Sim | William Wilson | 7/1865 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC89 East Perthshire, Blairgowrie | John Lowell | | 17/8/1997 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC89 East Perthshire, Blairgowrie | John Lowell | | 17/8/1997 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC89 East Perthshire, Loch Clunie [Cluny] | Francis Druce | Charles Bailey Eyre de Crespigny | | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC89 East Perthshire, Loch Clunie [Cluny] | Abram Sturrock George Claridge Druce | | 7/1883 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC89 East Perthshire, Loch Clunie [Cluny] | Douglas Montague Heath | Douglas Montague Heath | 10/6/1934 | BIRM |