+ | Lobelia urens | GB, VC3 South Devon, Axminster,Kilmington | | Botanical Society & Exchange Club of The British Isles | | MANCH |
+ | Lobelia urens | GB, VC11 South Hampshire, Christchurch,Hinton | George Claridge Druce | Botanical Society & Exchange Club of The British Isles George Claridge Druce | 8/1927 | MANCH |
+ | Lotus angustissimus | GB, VC113 Channel Islands, Saint Lawrence's Valley, Jersey | Louis Arsene | Botanical Society & Exchange Club of The British Isles | 1/7/1930 | MANCH |
+ | Lotus angustissimus | GB, VC113 Channel Islands, Saint Lawrence's Valley, Jersey | Louis Arsene | Botanical Society & Exchange Club of The British Isles | 1/7/1930 | MANCH |
| Luzula arcuata | GB, VC97 West Inverness-shire, Aonach Beag | Edward Charles Wallace Robert MacKechnie | Botanical Society & Exchange Club of The British Isles | 15/7/1936 | SLBI |
+ | Luzula forsteri x pilosa = L. x borreri | GB, VC14 East Sussex, Mayfield,Knowle | Anthony Hurt Wolley Dod | Botanical Society & Exchange Club of The British Isles | 16/5/1926 | MANCH |
+ | Lythrum hyssopifolia | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | Louis Arsene | Botanical Society & Exchange Club of The British Isles | 1/8/1926 | MANCH |
| Lythrum portula | GB, VC4 North Devon, Badgworthy Valley | William Charles Barton | Botanical Society & Exchange Club of The British Isles William Charles Barton | 22/8/1917 | SLBI |
| Malva pusilla var. lasiocarpa | GB, VC10 Isle of Wight, Ryde | James Walter Long | Botanical Society & Exchange Club of The British Isles Charles Edward Britton | 1/8/1929 | SLBI |
| Malva pusilla | GB, VC60 West Lancashire, Morecambe | James Alfred Wheldon | Botanical Society & Exchange Club of The British Isles William Hunt Painter | 9/1899 | ABS |
+ | Matthiola sinuata | GB, VC113 Channel Islands, Jersey, Saint Ouen's Bay | Louis Arsene | Botanical Society & Exchange Club of The British Isles | 7/7/1926 | MANCH |
| Medicago polymorpha | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles Joseph Edward Little | 8/1928 to 9/1928 | SLBI |
| Melampyrum pratense | GB, VC17 Surrey, Tandridge | Charles Edward Britton | Botanical Society & Exchange Club of The British Isles Charles Edward Britton Harold Stuart Thompson | 2/8/1935 | BIRM |
| Mentha aquatica | GB, VC19 North Essex, Pebmarsh | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 6/9/1934 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC6 North Somerset, Priddy | James Walter White | Botanical Society & Exchange Club of The British Isles Joseph Edward Little | 24/9/1925 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Chiddingfold | Rowland John Burdon | Botanical Society & Exchange Club of The British Isles Job Edward Lousley | 19/9/1930 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC28 West Norfolk, Roydon Common | Eric Lister Swann | Botanical Society & Exchange Club of The British Isles | 29/8/1950 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC36 Herefordshire, Ledbury | Spencer Henry Bickham | Botanical Society & Exchange Club of The British Isles Job Edward Lousley Spencer Henry Bickham | 9/1931 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC70 Cumberland, Drigg | Robert Hardy Williamson | Botanical Society & Exchange Club of The British Isles George Claridge Druce Joseph Edward Little | 9/1924 | CGE |
+ | Mentha aquatica x spicata = M. x piperita | GB, VC92 South Aberdeenshire, Aberdeen | J Fraser | Botanical Society & Exchange Club of The British Isles | 19/8/1929 | MANCH |
+ | Mentha aquatica x spicata = M. x piperita | GB, VC93 North Aberdeenshire | J Fraser | Botanical Society & Exchange Club of The British Isles | 20/9/1927 | MANCH |
| Mentha arvensis | GB, VC6 North Somerset, Bristol | Ida Mary Roper | Botanical Society & Exchange Club of The British Isles Ida Mary Roper | 2/8/1928 | K |
| Mentha arvensis | GB, VC23 Oxfordshire, Ambrosden | George Claridge Druce | Botanical Society & Exchange Club of The British Isles Albert Bruce Jackson George Claridge Druce | 8/1927 | K |
| Mentha arvensis | GB, VC23 Oxfordshire, Ascot under Wychwood | George Claridge Druce | Botanical Society & Exchange Club of The British Isles George Claridge Druce | 7/1930 | K |
+ | Mentha arvensis x aquatica = M. x verticillata | GB, VC6 North Somerset, Walton in Gordano | Ida Mary Roper | Botanical Society & Exchange Club of The British Isles Ida Mary Roper | 27/8/1926 | MANCH |
+ | Mentha arvensis x aquatica = M. x verticillata | GB, VC13 West Sussex, Lurgashall | Rowland John Burdon | Botanical Society & Exchange Club of The British Isles | 14/8/1929 | MANCH |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC17 Surrey, Earlswood Common | Job Edward Lousley | Botanical Society & Exchange Club of The British Isles Charles Edward Britton | 8/9/1929 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC17 Surrey, Earlswood Common | Job Edward Lousley | Botanical Society & Exchange Club of The British Isles | 8/9/1929 | CGE |
+ | Mentha arvensis x aquatica = M. x verticillata | GB, VC17 Surrey, Hedge Court Pond | Job Edward Lousley | Botanical Society & Exchange Club of The British Isles | 28/8/1927 | MANCH |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC16 West Kent, Medway Valley Cultivated GB, VC17 Surrey, Kew Cultivated | J Fraser | Botanical Society & Exchange Club of The British Isles | 30/8/1924 | CGE |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC19 North Essex, Tiptree Heath | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 1/9/1912 | CGE |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC40 Shropshire, Meole Brace | James Cosmo Melvill | Botanical Society & Exchange Club of The British Isles James Cosmo Melvill | 17/8/1916 | CGE |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC40 Shropshire, Shrewsbury | | Botanical Society & Exchange Club of The British Isles Joseph Edward Little | 24/8/1917 | CGE |
+ | Mentha arvensis x aquatica = M. x verticillata | GB, VC40 Shropshire, Shrewsbury | | Botanical Society & Exchange Club of The British Isles Charles Bailey James Cosmo Melvill | 17/8/1916 | MANCH |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC40 Shropshire, Shrewsbury | James Cosmo Melvill | Botanical Society & Exchange Club of The British Isles James Cosmo Melvill | 17/8/1916 | LIV |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC83 Midlothian, Banlaw | Robert Stephen Adamson | Botanical Society & Exchange Club of The British Isles Joseph Edward Little | 26/8/1913 | CGE |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC19 North Essex, Alphamstone | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 26/8/1928 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC33 East Gloucestershire, Compton Abdale | Harry Joseph Riddelsdell | Botanical Society & Exchange Club of The British Isles Charles Edgar Salmon George Claridge Druce Joseph Edward Little | 11/9/1919 | CGE |
+ | Mentha arvensis x spicata = M. x gracilis | | George Claridge Druce | Botanical Society & Exchange Club of The British Isles Charles Bailey George Claridge Druce | | MANCH |
| Mentha arvensis x spicata = M. x gracilis | GB, VC17 Surrey, Leith Hill | Edward Charles Wallace | Botanical Society & Exchange Club of The British Isles Druce Herbarium, Oxford Edward Charles Wallace | 6/8/1934 | OXF |