| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC4 North Devon, Saint Giles | William Philip Hiern | Augustin Ley | 12/8/1905 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC17 Surrey, Frimley | Arthur Bennett | Botanical Exchange Club of The British Isles Augustin Ley | 8/1888 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC17 Surrey, Pirbright | William Hadden Beeby | Augustin Ley | 16/6/1889 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC12,VC17, Frimley | Edward Charles Wallace | Watson Botanical Exchange Club Edward Charles Wallace Harold Stuart Thompson W H Pearsall | 13/9/1931 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Blackbush Drain, Pondersbridge, Wittlesey | Alfred Fryer | Botanical Exchange Club of The British Isles Augustin Ley | 15/9/1894 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea | Alfred Fryer | Harold Stuart Thompson | 15/9/1894 | 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 | Alfred Fryer Charles Bailey | 22/6/1895 | BIRM |
| 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, 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, VC69 Westmorland, Haverthwaite | William Harold Pearsall | Douglas Montague Heath Frederick Robinson | 17/7/1919 | BIRM |
| 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, 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, VC89 East Perthshire, Loch Clunie [Cluny] | Douglas Montague Heath | Douglas Montague Heath | 10/6/1934 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC89 East Perthshire, Lunan Burn | Abram Sturrock | Botanical Exchange Club of The British Isles Arthur Bennett Augustin Ley | 18/8/1882 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC90 Angus, Rescobie Loch, Forfar | Edward Shearburn Marshall | Harold Stuart Thompson | 18/7/1892 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC98 Argyllshire, Connel | Charles Bailey | Botanical Exchange Club of The British Isles Charles Bailey Charles Bailey | 21/7/1885 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC98 Argyllshire, Connel Ferry | Charles Bailey | Botanical Exchange Club of The British Isles Augustin Ley Charles Bailey | 21/7/1885 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC98 Argyllshire, Connel Ferry | Charles Bailey | Botanical Exchange Club of The British Isles Augustin Ley Charles Bailey | 21/7/1885 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC102 South Ebudes, Bridgend | Augustin Ley | Augustin Ley | 5/9/1883 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC102 South Ebudes, Islay | Augustin Ley | Augustin Ley | 5/9/1883 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC109 Caithness, Loch of Winless | Frederick Janson Hanbury | Botanical Exchange Club of The British Isles Augustin Ley Frederick Janson Hanbury | 7/7/1886 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | IE, VCH2 North Kerry, Killarney | Reginald Wiliam Scully | Botanical Exchange Club of The British Isles Augustin Ley Reginald Wiliam Scully | 16/8/1888 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | IE, VCH2 North Kerry, River Laune | Reginald Wiliam Scully | Botanical Exchange Club of The British Isles Augustin Ley Reginald Wiliam Scully | 27/7/1889 | BIRM |
| Potamogeton gramineus x perfoliatus = P. x nitens | IE, Kerry, Killarney | Reginald Wiliam Scully | Botanical Exchange Club of The British Isles Augustin Ley Reginald Wiliam Scully | 13/8/1890 | 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, VC88 Mid Perthshire, Perth Bridge | John Thomas Irvine Boswell-Syme | | 9/1869 | BON |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC17 Surrey, Frimley | Arthur Bennett | Botanical Exchange Club of The British Isles Charles Bailey Eyre Champion de Crespigny | 8/1888 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC17 Surrey, Frimley | Arthur Bennett | Botanical Exchange Club of The British Isles Charles Bailey | 8/1888 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC17 Surrey, Frimley | William Hadden Beeby | Alfred Fryer Charles Bailey | 12/8/1888 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC17 Surrey, Pirbright | William Hadden Beeby | Alfred Fryer Charles Bailey | 12/8/1888 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea | Alfred Fryer | Alfred Fryer Charles Bailey | 15/9/1894 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea | Alfred Fryer | Alfred Fryer Charles Bailey | 25/6/1895 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea | Alfred Fryer | Botanical Exchange Club of The British Isles Charles Bailey | 15/9/1894 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea | Alfred Fryer | Charles Bailey | 18/9/1894 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea | Alfred Fryer | Alfred Fryer | 16/8/1895 | MANCH |
| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC29 Cambridgeshire, Whittlesea | Alfred Fryer | Alfred Fryer Charles Bailey | 11/9/1894 | MANCH |