| Melica uniflora | GB, VC16 West Kent, Eltham | | Charles Bailey John Wilson Rimington Spencer Henry Bickham | 1844 | MANCH |
| Melica uniflora | GB, VC20 Hertfordshire, Sandridge | | Manchester Museum Charles Bailey John Wilson Rimington Spencer Henry Bickham | 1856 | MANCH |
+ | Melittis melissophyllum | GB, VC2 East Cornwall, Bodmin | | Charles Bailey John Wilson Rimington | 1869 | MANCH |
+ | Melittis melissophyllum | GB, Cornwall, Cornwall,Truro | W S Stone | Charles Bailey John Wilson Rimington Spencer Henry Bickham | 1846 | MANCH |
+ | Melittis melissophyllum | GB, VC3 South Devon, Dartmouth | John Wilson Rimington | Charles Bailey John Wilson Rimington | | MANCH |
+ | Melittis melissophyllum | GB, Sussex | | Charles Bailey John Wilson Rimington Spencer Henry Bickham | 1844 | MANCH |
+ | Mentha aquatica x spicata = M. x piperita | GB, Kent, Orpington,River Cray | | Charles Bailey John Wilson Rimington | 1848 | MANCH |
+ | Mentha aquatica x spicata = M. x piperita | GB, VC62 North-east Yorkshire, Scarborough | | Charles Bailey John Wilson Rimington | 1848 | MANCH |
+ | Mentha arvensis x aquatica = M. x verticillata | GB, VC6 North Somerset, Clevedon | John Wilson Rimington | Charles Bailey John Wilson Rimington | 1842 | MANCH |
+ | Mentha arvensis x spicata = M. x gracilis | GB, VC17 Surrey, Croydon | | Charles Bailey John Wilson Rimington Spencer Henry Bickham | 1846 | MANCH |
+ | Mentha arvensis x spicata = M. x gracilis | GB, VC40 Shropshire, Buildwas | | Charles Bailey John Wilson Rimington Spencer Henry Bickham | 1843 | MANCH |
+ | Mentha citrata | GB, VC30 Bedfordshire | | Charles Bailey John Wilson Rimington | 1840 | MANCH |
+ | Mentha cordifolia | GB | | Charles Bailey John Wilson Rimington | 1837 | MANCH |
+ | Mentha pulegium | GB, VC21 Middlesex, Hampstead | | Charles Bailey John Wilson Rimington | 1840 | MANCH |
+ | Mentha spicata x suaveolens = M. x villosa | GB, VC64 Mid-west Yorkshire, Settle | Silvanus Thompson | Charles Bailey John Wilson Rimington Spencer Henry Bickham | 1844 | MANCH |
+ | Mentha suaveolens x longifolia = M. x rotundifolia | GB, VC10 Isle of Wight, Saint Lawrence | George Stacey Gibson | Charles Bailey John Wilson Rimington Spencer Henry Bickham | 9/1843 | MANCH |
+ | Mentha suaveolens x longifolia = M. x rotundifolia | GB, VC34 West Gloucestershire, Tidenham | George Henry Kendrick Thwaites | Charles Bailey John Wilson Rimington Spencer Henry Bickham | 1841 | MANCH |
+ | Mertensia maritima | | | Charles Bailey John Wilson Rimington | 26/6/1892 | MANCH |
+ | Mertensia maritima | GB, VC3 South Devon, Babbacombe | | John Wilson Rimington Spencer Henry Bickham | | MANCH |
+ | Mertensia maritima | GB, VC91 Kincardineshire, Stonehaven | | Charles Bailey John Wilson Rimington | 1827 | MANCH |
+ | Mertensia maritima | GB, VC100 Clyde Islands, Isle of Arran,Holy Island | | Charles Bailey John Wilson Rimington | 2/5/1891 | MANCH |
+ | Mertensia maritima | GB, VC100 Clyde Islands, Isle of Bute | | Charles Bailey John Wilson Rimington | | MANCH |
+ | Meum athamanticum | GB, VC90 Angus | N J. von Jacquin | Charles Bailey John Wilson Rimington | 1845 | MANCH |
+ | Mibora minima | GB, Essex, Essex | | Charles Bailey John Wilson Rimington | 1840 | MANCH |
+ | Mibora minima | GB, VC52 Anglesey | John Bland Wood | Charles Bailey John Wilson Rimington | 4/1843 | MANCH |
| Milium effusum | GB, VC21 Middlesex, Hornsey | | Charles Bailey John Wilson Rimington | 1841 | MANCH |
+ | Minuartia sedoides | GB, VC88 Mid Perthshire, Ben Lawers | N B | Charles Bailey John Wilson Rimington | | MANCH |
+ | Minuartia sedoides | GB, VC88 Mid Perthshire, Breadalbane Mountains | | Charles Bailey John Wilson Rimington | 1838 | MANCH |
+ | Minuartia verna | GB, VC1 West Cornwall, The Lizard | | Charles Bailey John Wilson Rimington | | MANCH |
+ | Misopates orontium | GB, VC16 West Kent, Dartford | | Charles Bailey John Wilson Rimington | 1840 | MANCH |
+ | Misopates orontium | GB, VC17 Surrey, Battersea | | Charles Bailey John Wilson Rimington | 1846 | MANCH |
+ | Misopates orontium | GB, VC62 North-east Yorkshire, Scarborough | John Wilson Rimington | Charles Bailey John Wilson Rimington | 1840 | MANCH |
+ | Muscari neglectum | GB, VC20 Hertfordshire, Baldock | | Charles Bailey John Wilson Rimington | 1840 | MANCH |
+ | Muscari neglectum | GB, VC29 Cambridgeshire, Gog Magog Hills | H L Jones | Charles Bailey John Wilson Rimington | 1/5/1876 | MANCH |
+ | Myosurus minimus | GB, VC17 Surrey | | Charles Bailey John Wilson Rimington | | MANCH |
+ | Myosurus minimus | GB, VC55 Leicestershire | | Charles Bailey John Wilson Rimington | 1843 | MANCH |
+ | Myriophyllum verticillatum | GB, VC64 Mid-west Yorkshire, Skipton | | Charles Bailey John Wilson Rimington | 1840 | MANCH |
| Narcissus tazetta x poeticus = N. x medioluteus | GB, VC63 South-west Yorkshire, Halifax | Samuel King | Charles Bailey John Wilson Rimington Spencer Henry Bickham | 27/4/1844 | MANCH |
| Nasturtium sylvestre | GB, VC34 West Gloucestershire, Bristol | | Charles Bailey John Wilson Rimington Spencer Henry Bickham | 1842 | MANCH |
| Nasturtium sylvestre | GB, VC67 South Northumberland, Newcastle upon Tyne | | Charles Bailey John Wilson Rimington Spencer Henry Bickham | 1846 | MANCH |