| Mentha aquatica x spicata = M. x piperita | GB, VC20 Hertfordshire, Bengeo | William Higgins Coleman | Druce Herbarium, Oxford | 30/9/1843 | OXF |
| Mentha aquatica x spicata = M. x piperita | Cultivated | James Walter White | Druce Herbarium, Oxford Edward Walter Hunnybun J Fraser | | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC79 Selkirkshire, Galashiels | Ida Margaret Hayward | Druce Herbarium, Oxford | 1913 | OXF |
| Mentha aquatica x spicata = M. x piperita var. citrata | | | Druce Herbarium, Oxford | | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC41 Glamorganshire, Llanmadoc | George Claridge Druce | George Claridge Druce | 6/1916 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC78 Peeblesshire, Peebles | George Claridge Druce | George Claridge Druce | | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC70 Cumberland, Melmerby | | Druce Herbarium, Oxford | 9/1920 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC43 Radnorshire, Bough Wood | | Druce Herbarium, Oxford | 1927 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC4 North Devon, Lynmouth | George Claridge Druce | Druce Herbarium, Oxford George Claridge Druce J Fraser | 8/1896 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Friday Street | J Fraser | Botanical Exchange Club of The British Isles J Fraser | 28/8/1927 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC5 South Somerset, Minehead | Isabella Gifford | | 1866 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC23 Oxfordshire, Oxford Cultivated | | | 9/1866 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC27 East Norfolk, Sprowston | Kirby Trimmer | | 8/1858 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC27 East Norfolk, Southwood | Kirby Trimmer | | 6/1861 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC27 East Norfolk, Southwood | Kirby Trimmer | | 1861 | OXF |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC39 Staffordshire, Barton under Needwood | Kirby Trimmer | | 15/8/1854 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC21 Middlesex, Northwood Cultivated | Rex Alan Henry Graham | Rex Alan Henry Graham | 16/8/1952 | OXF |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC49 Caernarvonshire, Capel Curig | | Druce's Original Herbarium | | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC27 East Norfolk, Heigham Sound | Kirby Trimmer | | 9/1861 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC28 West Norfolk, Holme Hale | Kirby Trimmer | | 10/1867 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC27 East Norfolk, Norwich, Heigham | Kirby Trimmer | | 9/1862 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC27 East Norfolk, Catfield | Kirby Trimmer | | 8/1859 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Virginia Water | | | | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC64 Mid-west Yorkshire, Cookridge | William Arthur Sledge | Botanical Exchange Club of The British Isles William Arthur Sledge | 26/9/1928 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC6 North Somerset, Weston in Gordano | Ida Mary Roper | Ida Mary Roper | 27/8/1919 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC39 Staffordshire, Langley | Kirby Trimmer | | 8/1854 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC27 East Norfolk, Tibenham | Kirby Trimmer | | 9/1858 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC6 North Somerset, Weston in Gordano | Ida Mary Roper | Ida Mary Roper | 29/8/1919 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC37 Worcestershire, Alfrick Cultivated | Job Edward Lousley | Botanical Exchange Club of The British Isles | 19/8/1934 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC27 East Norfolk, Heigham | Kirby Trimmer | | 9/1862 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC27 East Norfolk, Southwood | Kirby Trimmer | | 9/1859 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC27 East Norfolk, Limpenhoe | Kirby Trimmer | | 9/1863 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC34 West Gloucestershire, Longhope | Gustavus A Ornano St Brody | | 1869 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC6 North Somerset, Lansdown | | | | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Wallington Cultivated GB, VC20 Hertfordshire, Roydon | Arthur Langford Still | Botanical Exchange Club of The British Isles | 6/9/1936 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC8 South Wiltshire, Bedwyn Brail | Cecil Prescott Hurst | Druce Herbarium, Oxford | 14/7/1922 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Gomshall Cultivated | J J | | 8/1870 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC70 Cumberland, Skinwith Beck | Clara Winsome Muirhead | Carlisle Museum Herbarium | 27/8/1949 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC64 Mid-west Yorkshire, Howgill | R C Palmer | Druce Herbarium, Oxford | 9/1952 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Wallington Cultivated GB, VC6 North Somerset, Weston in Gordano | Arthur Langford Still | | 8/1937 | OXF |