| Limosella aquatica | GB, VC17 Surrey, Esher | Wilson Crosfield Worsdell | George Valentine Chapman Last | 30/7/1917 | K |
| Linaria purpurea | GB, VC69 Westmorland, Furness Abbey | Wilson Crosfield Worsdell | George Valentine Chapman Last | 7/1900 | K |
| Linaria vulgaris | GB, VC3 South Devon, Bovey Tracey | Wilson Crosfield Worsdell | George Valentine Chapman Last | 8/1924 | K |
| Marrubium vulgare | GB, VC9 Dorset, Studland | Wilson Crosfield Worsdell | George Valentine Chapman Last | 10/7/1935 | K |
| Melissa officinalis | GB, VC3 South Devon, Liverton | Wilson Crosfield Worsdell | George Valentine Chapman Last | 8/1924 | K |
| Melittis melissophyllum | GB, VC3 South Devon, Newton Abbot | Wilson Crosfield Worsdell | George Valentine Chapman Last | 5/1925 | K |
| Mentha arvensis var. obtusifolia | GB, VC3 South Devon, Bovey Tracey | Wilson Crosfield Worsdell | George Valentine Chapman Last | 7/1924 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC3 South Devon, Bovey Tracey | Wilson Crosfield Worsdell | George Valentine Chapman Last | 8/1924 | K |
| Mentha gentilis var. varigata | GB, VC69 Westmorland, Arnside | Wilson Crosfield Worsdell | George Valentine Chapman Last | 9/1906 | K |
| Mentha pulegium | GB, VC3 South Devon, Torcross | Wilson Crosfield Worsdell | George Valentine Chapman Last | 15/9/1923 | K |
| Mentha spicata x suaveolens = M. x villosa | GB, VC1 West Cornwall, Newquay | Wilson Crosfield Worsdell | George Valentine Chapman Last | 8/1922 | K |
| Mentha suaveolens | GB, VC3 South Devon, Scabbacombe | Wilson Crosfield Worsdell | George Valentine Chapman Last | 5/9/1942 | K |
| Meum athamanticum | GB, VC90 Angus, Clova | Wilson Crosfield Worsdell | George Valentine Chapman Last | 12/7/1894 | K |
| Meum athamanticum | GB, VC90 Angus, Clova | Wilson Crosfield Worsdell | George Valentine Chapman Last | 12/7/1894 | K |
| Misopates orontium | GB, VC9 Dorset, Studland | Wilson Crosfield Worsdell | George Valentine Chapman Last | 7/1937 | K |
| Monotropa hypopitys | GB, VC17 Surrey, Shere | Wilson Crosfield Worsdell | George Valentine Chapman Last | 2/8/1936 | K |
| Monotropa hypopitys | GB, VC6 North Somerset, Freshford | Wilson Crosfield Worsdell | | 14/8/1917 | K |
| Orchis morio | GB, VC69 Westmorland, Arnside | Wilson Crosfield Worsdell | | 5/1906 | K |
| Orchis ustulata | GB, VC69 Westmorland, Arnside | Wilson Crosfield Worsdell | George Valentine Chapman Last | 6/1894 | K |
| Origanum vulgare | GB, VC9 Dorset, Corfe Castle | Wilson Crosfield Worsdell | George Valentine Chapman Last | 7/1935 | K |
| Origanum vulgare | GB, VC69 Westmorland, Arnside | Wilson Crosfield Worsdell | George Valentine Chapman Last | 7/1895 | K |
| Plantago coronopus | GB, VC3 South Devon, Torquay | Wilson Crosfield Worsdell | | 2/6/1924 | K |
| Plantago major | GB, VC15 East Kent, Preston | Wilson Crosfield Worsdell | | 9/1930 | K |
| Plantago major subsp. major | GB, VC3 South Devon, Bovey Tracey | Wilson Crosfield Worsdell | George Valentine Chapman Last | 7/1924 | K |
| Plantago maritima | GB, VC90 Angus, Clova | Wilson Crosfield Worsdell | | 3/8/1894 | K |
| Plantago media | GB, VC69 Westmorland, Arnside | Wilson Crosfield Worsdell | George Valentine Chapman Last | 22/8/1895 | K |
| Polystichum lonchitis | GB, VC90 Angus, Glen Doll | Wilson Crosfield Worsdell | George Valentine Chapman Last | 16/7/1894 | K |
| Polystichum lonchitis | GB, VC88 Mid Perthshire, Creag an Lochain | Wilson Crosfield Worsdell | George Valentine Chapman Last | 13/9/1895 | K |
| Pyrola media | GB, VC90 Angus, Clova | Wilson Crosfield Worsdell | George Valentine Chapman Last | 23/7/1894 | K |
| Scrophularia nodosa | GB, VC3 South Devon, Bovey Tracey | Wilson Crosfield Worsdell | | 7/1924 | K |
| Scrophularia scorodonia | GB, VC1 West Cornwall, Newquay | Wilson Crosfield Worsdell | George Valentine Chapman Last | 7/1922 | K |
| Scrophularia umbrosa | GB, VC69 Westmorland, Appleby | Wilson Crosfield Worsdell | George Valentine Chapman Last | 7/1939 | K |
| Scrophularia umbrosa | GB, VC69 Westmorland, Appleby | Wilson Crosfield Worsdell | | 7/1939 | K |
| Scrophularia vernalis | GB, VC17 Surrey, Kew | Wilson Crosfield Worsdell | George Valentine Chapman Last | 14/5/1918 | K |
| Scutellaria minor | IE, VCH2 North Kerry, Glenfleak | Wilson Crosfield Worsdell | George Valentine Chapman Last | 16/7/1896 | K |
| Scutellaria minor | GB, VC24 Buckinghamshire, Farnham Royal | Wilson Crosfield Worsdell | | 8/1893 | K |
| Sibthorpia europaea | GB, VC1 West Cornwall, Newlyn, Penzance | Wilson Crosfield Worsdell | George Valentine Chapman Last | 7/1922 | K |
| Silene conica | GB, VC13 West Sussex, Littlehampton | Wilson Crosfield Worsdell | George Valentine Chapman Last | 6/1925 | K |
| Sium latifolium | GB, VC15 East Kent, Romney Marsh | Wilson Crosfield Worsdell | George Valentine Chapman Last | 4/9/1930 | K |
| Stachys arvensis | GB, VC69 Westmorland, Arnside | Wilson Crosfield Worsdell | George Valentine Chapman Last | 7/1920 | K |