| Carex flacca | GB, VC59 South Lancashire, Prestwich | James Cosmo Melvill | Botanical Exchange Club of The British Isles Augustin Ley | 1903 | BIRM |
| Carex lachenalii | GB, VC92 South Aberdeenshire, Lochnagar | Thomas Rogers | James Cosmo Melvill Thomas Rogers Thomas Jackson Foggitt | 22/7/1876 | BM |
| Carex laevigata | GB, VC88 Mid Perthshire, Falls of Lochay | James Cosmo Melvill | Augustin Ley James Cosmo Melvill | 29/7/1891 | BIRM |
| Carex magellanica subsp. irrigua | GB, Mid-West Perthshire, Crianlarich | James Cosmo Melvill | James Cosmo Melvill | 30/7/1891 | ABS |
+ | Carex maritima | GB, VC108 West Sutherland, Below Betty Hill | James Cosmo Melvill | Charles Bailey James Cosmo Melvill | 26/7/1888 | MANCH |
| Carex maritima | GB, VC108 West Sutherland, River Naver at Invernaver | James Cosmo Melvill | Augustin Ley James Cosmo Melvill | 25/7/1888 | BIRM |
| Carex nigra | GB, VC88 Mid Perthshire, Crianlarich | James Cosmo Melvill | Augustin Ley James Cosmo Melvill | 5/8/1891 | BIRM |
| Carex nigra | GB, VC88 Mid Perthshire, Crianlarich | James Cosmo Melvill | Augustin Ley James Cosmo Melvill | 30/7/1891 | BIRM |
| Carex nigra var. juncella | GB, Mid-West Perthshire, Crianlarich | James Cosmo Melvill | Augustin Ley James Cosmo Melvill | 30/7/1891 | BIRM |
| Carex pulla | GB, Mid-West Perthshire, Beinn Laoigh | James Cosmo Melvill | James Cosmo Melvill | 31/7/1891 | ABS |
| Carex pulla | GB, VC88 Mid Perthshire, Ben Laoigh [Ben Lui] | James Cosmo Melvill | James Cosmo Melvill | 31/7/1891 | ABS |
| Carex pulla | GB, VC88 Mid Perthshire, Ben Laoigh [Ben Lui] | James Cosmo Melvill | Augustin Ley James Cosmo Melvill | 31/7/1891 | BIRM |
| Carex rariflora | GB, VC90 Angus, Caenlochan Glen | | William Hunt Painter James Cosmo Melvill | 7/1878 | ABS |
| Carex x helvola | GB, VC92 South Aberdeenshire, Lochnagar | William Andrew Shoolbred | James Cosmo Melvill Thomas Jackson Foggitt | | BM |
| Cerastium fontanum | GB, VC40 Shropshire, Carding Mill Valley | James Cosmo Melvill | Augustin Ley | 10/9/1903 | BIRM |
| Chenopodium capitatum | GB, VC49 Caernarvonshire, Llandudno | James Cosmo Melvill | Botanical Exchange Club of The British Isles Augustin Ley | 9/1898 | BIRM |
| Circaea lutetiana x alpina = C. x intermedia | GB, VC88 Mid Perthshire, Comrie | James Cosmo Melvill | James Cosmo Melvill William Hunt Painter | 7/8/1891 | ABS |
| Circaea lutetiana x alpina = C. x intermedia | GB, VC88 Mid Perthshire, Dalrannoch | James Cosmo Melvill | Botanical Exchange Club of The British Isles Augustin Ley James Cosmo Melvill | 8/1888 | BIRM |
| Circaea lutetiana x alpina = C. x intermedia | GB, VC88 Mid Perthshire, Comrie | James Cosmo Melvill | Augustin Ley James Cosmo Melvill | 8/1891 | BIRM |
| Circaea lutetiana x alpina = C. x intermedia | GB, VC88 Mid Perthshire, Dalrannoch | James Cosmo Melvill | Botanical Exchange Club of The British Isles | 8/1888 | SLBI |
+ | Clinopodium menthifolium | GB, VC10 Isle of Wight, Apesdown | James Cosmo Melvill William Lowndes Notcutt | Botanical Exchange Club of The British Isles Charles Bailey James Cosmo Melvill | 8/1882 | MANCH |
+ | Clinopodium menthifolium | GB, VC10 Isle of Wight, Apesdown | Charles Bailey | Charles Bailey James Cosmo Melvill Charles Bailey | 8/10/1888 | MANCH |
| Cochlearia officinalis | GB, VC108 West Sutherland, Ben Hope | James Cosmo Melvill | Botanical Exchange Club of The British Isles William Hadden Beeby | 20/7/1888 | SLBI |
+ | Cochlearia pyrenaica | GB, VC108 West Sutherland, Ben Hope | James Cosmo Melvill | | 20/7/1888 | BIRM |
| Cochlearia pyrenaica subsp. alpina | GB, VC108 West Sutherland, Ben Hope | James Cosmo Melvill | Botanical Exchange Club of The British Isles Augustin Ley James Cosmo Melvill | 20/7/1888 | BIRM |
| Corydalis solida | GB, VC40 Shropshire, Meole Brace | James Cosmo Melvill | Botanical Exchange Club of The British Isles Chambre Corker Vigurs | 4/1906 | ABS |
| Corydalis solida | GB, VC40 Shropshire, Meole Brace | James Cosmo Melvill | Botanical Exchange Club of The British Isles Augustin Ley | 4/1906 | BIRM |
+ | Corynephorus canescens | GB, VC113 Channel Islands, Jersey | James Cosmo Melvill | Charles Bailey | 6/1879 | MANCH |
+ | Corynephorus canescens | GB, VC113 Channel Islands, Jersey | James Cosmo Melvill | | 7/1876 | MANCH |
+ | Crepis mollis | GB, VC92 South Aberdeenshire, Braemar | James Cosmo Melvill | Charles Bailey James Cosmo Melvill | 21/7/1878 | MANCH |
| Crepis mollis | GB, VC92 South Aberdeenshire, Braemar | James Cosmo Melvill | James Cosmo Melvill | 21/7/1878 | K |
+ | Cynodon dactylon | GB, VC113 Channel Islands, Guernsey,Vazon Bay | James Cosmo Melvill | James Cosmo Melvill | 8/1876 | MANCH |
| Cynosurus echinatus | GB, VC113 Channel Islands, Saint Helier , Jersey | James Cosmo Melvill | Botanical Exchange Club of The British Isles Augustin Ley James Cosmo Melvill | 19/6/1879 | BIRM |
+ | Cyperus longus | GB, VC113 Channel Islands, Guernsey | James Cosmo Melvill | Lower Mosley St Schools Natural History Society Charles Bailey | 8/1876 | MANCH |
+ | Cytisus scoparius subsp. maritimus | GB, VC113 Channel Islands, Guernsey,Torteval Parish | James Cosmo Melvill | Charles Bailey | 25/6/1879 | MANCH |
+ | Deschampsia cespitosa subsp. alpina | GB, VC92 South Aberdeenshire, Lochnagar | James Cosmo Melvill | Charles Bailey James Cosmo Melvill | 7/1878 | MANCH |
| Deschampsia cespitosa subsp. alpina | GB, VC92 South Aberdeenshire, Braemar | James Cosmo Melvill | Robert Large Baker Elizabeth Anne Lomax | 7/1878 | BIRM |
| Deschampsia cespitosa subsp. alpina | GB, VC92 South Aberdeenshire, Lochnagar | James Cosmo Melvill | William Hunt Painter | 7/1878 | ABS |
+ | Deschampsia flexuosa | GB, VC88 Mid Perthshire, Ben Vorlich | James Cosmo Melvill | | 9/8/1878 | PTH |
+ | Dianthus armeria | GB, VC113 Channel Islands, Sark | James Cosmo Melvill | Lower Mosley St Schools Natural History Society | 7/1876 | MANCH |