| Mentha aquatica x spicata = M. x piperita | GB, VC38 Warwickshire, Emscote | Henry Bromwich | George Claridge Druce | 9/1868 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC38 Warwickshire, Warwick | Henry Bromwich | Druce Herbarium, Oxford F Stratton | 9/1877 | 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, VC39 Staffordshire, Langley | Kirby Trimmer | | 8/1854 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC40 Shropshire, Clun Church | Richard Charles Palmer | Druce Herbarium, Oxford | 4/9/1951 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC41 Glamorganshire, Dinas Powis GB, VC41 Glamorganshire, Wenvoe | S Dewar | Botanical Exchange Club of The British Isles Druce Herbarium, Oxford National Museum of Wales Arthur Edward Wade | 14/9/1932 | 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, VC43 Radnorshire, Bough Wood | | Druce Herbarium, Oxford | 1927 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC43 Radnorshire, Glasbury | George Claridge Druce | | 9/1929 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC47 Montgomeryshire, Craig Breidden | George Claridge Druce | George Claridge Druce | 1896 | 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, VC50 Denbighshire, Gresford | John Bland Wood | John Bland Wood | 24/10/1841 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC54 North Lincolnshire, Tobyon | Marsden | Druce Herbarium, Oxford George Claridge Druce | | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC57 Derbyshire, Belper | Edward Francis Linton | Druce Herbarium, Oxford Edward Francis Linton | 22/9/1892 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC57 Derbyshire, Belper | | Botanical Exchange Club of The British Isles Druce's Original Herbarium Edward Francis Linton | 9/1892 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC57 Derbyshire, Bradford Dale | H J Killick | Druce Herbarium, Oxford | 28/8/1999 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC57 Derbyshire, Snelston | J Fraser | Botanical Exchange Club of The British Isles Druce's Original Herbarium Edward Francis Linton | 9/1892 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC58 Cheshire, Knutsford,Plumbley | Charles Bailey | Druce Herbarium, Oxford | 15/9/1900 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC58 Cheshire, Knutsford,Tabley Park | Charles Bailey | George Claridge Druce | 15/9/1900 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC63 South-west Yorkshire, Doncaster | John Hardy | John Hardy Charles Bailey | | 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, VC64 Mid-west Yorkshire, Howgill | R C Palmer | Druce Herbarium, Oxford | 9/1952 | OXF |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC68 North Northumberland, Hedgehope Hill | W Fampton | Druce Herbarium, Oxford William Wilson Saunders Dawes Cholmeley Russell | | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC69 Westmorland, Kirkby Stephen | | | 8/1913 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC70 Cumberland, Drigg | Robert Hardy Williamson | George Claridge Druce | 1924 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC70 Cumberland, Drigg | Robert Hardy Williamson | | 1924 | 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, VC70 Cumberland, Skinwith Beck | Clara Winsome Muirhead | Carlisle Museum Herbarium | 27/8/1949 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC78 Peeblesshire, Kittlegairy Hill | Charles Bailey | Botanical Exchange Club of The British Isles Druce Herbarium, Oxford | 27/9/1898 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC78 Peeblesshire, Kittlegairy Hill | Charles Bailey | | 27/9/1898 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC78 Peeblesshire, Peebles | Charles Bailey | Botanical Exchange Club of The British Isles Charlotte Ellen Palmer George Claridge Druce | 27/9/1898 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC78 Peeblesshire, Peebles | George Claridge Druce | | 9/1917 | 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, VC79 Selkirkshire, Galashiels | Ida Margaret Hayward | Druce Herbarium, Oxford | 1913 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC84 West Lothian, Linlithgow | | Isaac Bayley Balfour | 12/9/1871 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC87 West Perthshire, Callander | Young | | | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC88 Mid Perthshire, Fortingall | Edmund Frederic Warburg | Druce Herbarium, Oxford | 2/9/1947 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC90 Angus, Guthrie | George Claridge Druce Margaret Corstorphine Robert Henry Corstorphine | | 9/1912 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC92 South Aberdeenshire, Alford | George Claridge Druce | | 8/1918 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC93 North Aberdeenshire, Fyvie | F Turreff | George Claridge Druce | 8/1929 | OXF |