| Lamium purpureum var. hybridum | GB, VC83 Midlothian, Edinburgh | Thomas Bell Salter | Botanical Society of London George Cheetham Churchill | 5/1836 | K |
| Leonurus cardiaca | GB, VC2 East Cornwall, Whitsand Bay | | Francis Henry Goulding George Cheetham Churchill | 7/1850 | K |
| Ligustrum vulgare | GB, VC20 Hertfordshire, Aldbury | | George Cheetham Churchill | | K |
| Ligustrum vulgare | GB, VC20 Hertfordshire, Redbourn | | George Cheetham Churchill | 10/10/1850 | K |
| Limosella aquatica | GB, VC17 Surrey, Cut Mill Pond | John Drew Salmon | George Cheetham Churchill | 8/1856 | K |
| Limosella aquatica | GB, VC49 Caernarvonshire, Llanberis | | George Cheetham Churchill | 8/1853 | K |
| Linaria pelisseriana | GB, VC113 Channel Islands, Jersey St Brelade | Jean Piquet | George Cheetham Churchill | 1/6/1856 | K |
| Linaria pelisseriana | GB, VC113 Channel Islands, Saint Brelade, Jersey | Jean Piquet | George Cheetham Churchill George Edward Hunt | 6/1856 | K |
| Linaria repens | GB, VC11 South Hampshire, Beaulieu | Robert Southey Hill | George Cheetham Churchill Robert Southey Hill | 1857 | K |
| Linaria repens | GB, VC11 South Hampshire, Gosport, Stokes Bay | | George Cheetham Churchill | 8/1860 | K |
| Linaria repens | GB, VC88 Mid Perthshire, River Tay | Alexander Osmond Black | George Cheetham Churchill | 8/1852 | K |
| Linaria spartea | GB, VC17 Surrey, Walton | | George Cheetham Churchill Hewett Cottrell Watson | 9/1843 | K |
| Linaria supina | GB, VC3 South Devon, Cattedown | G Lawson | George Cheetham Churchill John Thomas Irvine Boswell-Syme | 7/1850 | K |
| Linaria supina | GB, VC3 South Devon, Cattedown | Francis Henry Goulding | George Cheetham Churchill | 7/1845 | K |
| Lycopus europaeus | GB, VC60 West Lancashire, Lytham | | George Cheetham Churchill | 4/7/1861 | K |
| Lycopus europaeus | IE, VCH16 West Galway, Roundstone | | George Cheetham Churchill | 19/8/1865 | K |
| Lycopus europaeus | IE, VCH16 West Galway, Roundstone | George Cheetham Churchill | George Cheetham Churchill | 20/8/1865 | K |
| Marrubium vulgare | GB, VC6,VC34, Bristol | George Henry Kendrick Thwaites | George Cheetham Churchill George Henry Kendrick Thwaites | | K |
| Melissa officinalis | GB, VC36 Herefordshire, Whitchurch | George Maw | George Maw George Cheetham Churchill | 9/1848 | K |
| Melittis melissophyllum | GB, VC4 North Devon, Linton | Anna Russell | George Cheetham Churchill | | K |
| Mentha aquatica | GB, VC20 Hertfordshire, Redbournbury | George Cheetham Churchill | George Cheetham Churchill | 30/8/1850 | K |
| Mentha aquatica | IE, VCH16 West Galway, Connemara,Roundstone | | George Cheetham Churchill | 20/8/1865 | K |
| Mentha aquatica | IE, VCH16 West Galway, Roundstone | | George Cheetham Churchill | 20/8/1865 | K |
| Mentha aquatica x spicata = M. x piperita | GB, VC64 Mid-west Yorkshire, Acomb | R Spence | Botanical Society of Edinburgh George Cheetham Churchill | 8/1841 | K |
| Mentha aquatica x spicata = M. x piperita var. crispa | GB, VC64 Mid-west Yorkshire, Settle | John Tatham | George Cheetham Churchill | | K |
| Mentha arvensis | GB, VC20 Hertfordshire, Essendon | | George Cheetham Churchill | 21/8/1850 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC15 East Kent, Maidstone | Frederic Barham | George Cheetham Churchill | 8/1849 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC58 Cheshire, Mere | George Edward Hunt | George Cheetham Churchill George Edward Hunt | 8/1864 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC64 Mid-west Yorkshire, Settle | | George Cheetham Churchill John Tatham | 9/1838 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC64 Mid-west Yorkshire, Settle | | George Cheetham Churchill John Tatham | 9/1842 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC85 Fifeshire, Cleish | | Botanical Society of Edinburgh George Cheetham Churchill Dewar | 9/1845 | K |
| Mentha gentilis var. gracilis | GB, VC55 Leicestershire, Ashby-de-la-Zouch | William Henry Purchas | George Cheetham Churchill George Edward Hunt William Henry Purchas | 8/1863 | K |
| Mentha piperita var. piperita | GB, VC20 Hertfordshire, Harpenden, Lea Bridge | | George Cheetham Churchill | 20/9/1850 | K |
| Mentha pulegium | GB, VC11 South Hampshire, Romsey | Anna Rupell | George Cheetham Churchill | | K |
| Mentha pulegium | GB, VC12 North Hampshire, Sherfield Green | Robert Southey Hill | George Cheetham Churchill Robert Southey Hill | 1856 | K |
| Mentha requienii | | | George Cheetham Churchill | | K |
| Mentha spicata | GB, VC20 Hertfordshire, Woodside | | George Cheetham Churchill | 25/9/1850 | K |
| Mentha spicata | GB, VC82 East Lothian, Herdmanston | Carnegy | George Cheetham Churchill | 9/1841 | K |
| Mentha spicata x suaveolens = M. x villosa | GB, VC19 North Essex, Great Braxted | Ezekiel George Varenne | George Cheetham Churchill | 1847 | K |
| Mentha spicata x suaveolens = M. x villosa | GB, VC20 Hertfordshire, Ashwell | Henry Fordham | George Cheetham Churchill Henry Fordham | | K |