| Legousia hybrida | GB, VC82 East Lothian, Aberlady GB, VC82 East Lothian, Gullane | John Hutton Balfour | Richmond Museum Charles Bailey James Ward | 6/1836 | MANCH |
| Ligustrum vulgare | GB, VC65 North-west Yorkshire, Richmond | James Ward | William Jackson Hooker | | K |
+ | Limosella aquatica | GB, VC65 North-west Yorkshire, Bolton-on-Swale | James Ward | John Hutton Balfour | 27/8/1837 | PTH |
| Limosella aquatica | GB, VC65 North-west Yorkshire, Richmond | | Botanical Society of Edinburgh James Ward | 27/8/1837 | K |
+ | Linnaea borealis | GB, VC74 Wigtownshire, Dumfries & Galloway,Mull of Galloway | James Ward | Charles Bailey | 7/1838 | MANCH |
+ | Lithospermum arvense | GB, VC65 North-west Yorkshire, Richmond | James Ward | Charles Bailey | 13/7/1856 | MANCH |
| Lobelia dortmanna | IE, VCH38 Co. Down, Mourne Mountains | Samuel Alexander Stewart | Richmond Museum Charles Bailey James Ward | 7/9/1865 | MANCH |
+ | Lolium temulentum | GB, VC65 North-west Yorkshire, Richmond | James Ward | Charles Bailey James Ward | 9/1849 | MANCH |
+ | Lonicera xylosteum | GB, VC65 North-west Yorkshire, Aske Wood | James Ward | Richmond Museum Charles Bailey | 2/6/1866 | MANCH |
+ | Lychnis alpina | GB, VC90 Angus, Clova | William Wilson | Charles Bailey James Ward James Ward | 7/1836 | MANCH |
+ | Lychnis viscaria | GB, VC83 Midlothian, Edinburgh | Gilbert McNab | Charles Bailey James Ward James Ward | 5/1836 | MANCH |
+ | Maianthemum bifolium | GB, VC62 North-east Yorkshire, Scarborough | James Ward | Charles Bailey | 22/5/1865 | MANCH |
+ | Maianthemum bifolium | GB, VC62 North-east Yorkshire, Scarborough | James Ward | Charles Bailey | 15/5/1867 | MANCH |
+ | Melampyrum sylvaticum | GB, VC65,VC66, County Durham,Teesdale,Wynch [Winch] Bridge | James Ward | | 7/1868 | MANCH |
| Melica uniflora | GB, VC65 North-west Yorkshire, Richmond | James Ward | Richmond Museum Charles Bailey | 24/5/1865 | MANCH |
| Mentha aquatica x spicata = M. x piperita | GB, VC65 North-west Yorkshire, Aske Wood | James Ward | | 9/9/1835 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC65 North-west Yorkshire, Richmond | James Ward | John Stevens Henslow | 9/9/1831 | CGE |
+ | Mentha aquatica x spicata = M. x piperita | GB, England | James Ward | Charles Bailey James Ward | 9/8/1867 | MANCH |
+ | Mentha aquatica x spicata = M. x piperita | GB, England | James Ward | | 12/9/1865 | MANCH |
+ | Mentha arvensis x spicata = M. x gracilis | GB, VC65 North-west Yorkshire, Bolton on Swale | James Ward | Charles Bailey | 5/9/1865 | MANCH |
+ | Mertensia maritima | GB, VC74 Wigtownshire, West Tarbet | John Hutton Balfour | Charles Bailey James Ward | 5/1836 | MANCH |
+ | Meum athamanticum | Cumbria, Kendal | | Charles Bailey James Ward | 6/1/1868 | MANCH |
| Milium effusum | GB, VC65 North-west Yorkshire, Richmond | James Ward | Richmond Museum Charles Bailey | 7/1838 | MANCH |
+ | Minuartia rubella | GB, VC88 Mid Perthshire, Ben Lawers | Balfour | James Ward | 7/1837 | MANCH |
+ | Minuartia sedoides | GB, VC90 Angus | John Hutton Balfour | Charles Bailey James Ward | 8/1837 | MANCH |
+ | Minuartia verna | GB, VC65 North-west Yorkshire, Richmond | James Ward | Richmond Museum Charles Bailey | 6/1836 | MANCH |
+ | Moneses uniflora | GB, VC107 East Sutherland, Coul | James Ward | Richmond Museum Charles Bailey Hewett Cottrell Watson | | MANCH |
+ | Monotropa hypopitys | GB, VC59 South Lancashire, Southport | James Ward | Richmond Museum Charles Bailey | 7/1864 | MANCH |
+ | Muscari neglectum | | James Ward | Charles Bailey James Ward | 5/1865 | MANCH |
+ | Myosotis alpestris | GB, Scotland | James Ward | Charles Bailey James Ward | 7/1867 | MANCH |
+ | Myosotis secunda | GB, Yorkshire, Whashton Springs | James Ward | John Hutton Balfour | 5/8/1838 | PTH |
+ | Myosurus minimus | GB, VC67 South Northumberland, Newcastle,Cow Hill | Robert Benson Bowman | Charles Bailey James Ward | 1830 | MANCH |
+ | Myriophyllum verticillatum | GB, VC64 Mid-west Yorkshire, Ripon | James Ward | Richmond Museum Charles Bailey | 6/1836 | MANCH |
+ | Myriophyllum verticillatum | GB, VC66 County Durham, nr Darlington | James Ward | Richmond Museum Charles Bailey | 28/7/1865 | MANCH |
| Narcissus tazetta x poeticus = N. x medioluteus | GB, VC50 Denbighshire, Rossett | James Ward | Richmond Museum Charles Bailey | 5/1868 | MANCH |
| Narcissus tazetta x poeticus = N. x medioluteus | GB, VC65 North-west Yorkshire, Richmond | James Ward | Richmond Museum Charles Bailey | 28/4/1866 | MANCH |
+ | Neottia nidus-avis | GB, VC65 North-west Yorkshire, Richmond | James Ward | Charles Bailey James Ward | 5/1831 | MANCH |
+ | Nepeta cataria | GB, VC62 North-east Yorkshire, Brompton | James Ward | Charles Bailey | 5/9/1865 | MANCH |
+ | Nepeta cataria | GB, VC65 North-west Yorkshire, Richmond | James Ward | Charles Bailey | 7/1841 | MANCH |
+ | Oenanthe fistulosa | GB, VC66 County Durham, nr Darlington | James Ward | Charles Bailey James Ward | 25/7/1865 | MANCH |