| Senecio aquaticus | GB, VC47 Montgomeryshire, Llyfnant Valley | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 13/8/1923 | SLBI |
| Montia fontana subsp. amporitana | GB, VC48 Merionethshire, Dolgellau | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 15/8/1923 | SLBI |
| Spergula arvensis var. sativa | GB, VC48 Merionethshire, Dolgellau | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 18/8/1923 | SLBI |
| Thymus polytrichus subsp. britannicus | GB, VC48 Merionethshire, Dolgellau, Pont Newydd | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 8/8/1923 | SLBI |
| Thymus polytrichus | GB, VC48 Merionethshire, Harlech Golf Club | William Charles Barton | Dulwich College Watson Botanical Exchange Club William Charles Barton | 11/8/1915 | SLBI |
| Thymus serpyllum | GB, VC48 Merionethshire, Harlech Golf Club | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 11/8/1915 | SLBI |
| Spiraea salicifolia | GB, VC48 Merionethshire, Llangower GB, VC48 Merionethshire, Llanuwchllyn | William Charles Barton | Watson Botanical Exchange Club | 9/8/1923 | SLBI |
| Impatiens glandulifera | GB, VC48 Merionethshire, Maentwrog | William Charles Barton | Watson Botanical Exchange Club | 7/9/1922 | SLBI |
| Potentilla erecta | GB, VC48 Merionethshire, Tyn y Groes | William Charles Barton | Watson Botanical Exchange Club | 12/8/1915 | SLBI |
| Rubus subintegribasis | GB, VC49 Caernarvonshire, Portmadoc | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 24/8/1922 15/9/1922 | SLBI |
| Carex leporina | GB, VC69 Westmorland, Harlock Reservoir | W H Pearsall | Watson Botanical Exchange Club William Charles Barton | 24/6/1922 | BM |
| Atriplex patula | GB, VC113 Channel Islands, Guernsey, Mont Cuet | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 10/8/1912 | BIRM |
| Trifolium strictum | GB, VC113 Channel Islands, Jersey | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 17/6/1923 | SLBI |
| Spergularia rubra | GB, VC113 Channel Islands, Jersey, Bel Royal | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 13/6/1923 | SLBI |
| Viola kitaibeliana var. nana | GB, VC113 Channel Islands, Jersey, Quennevais | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 14/6/1923 | SLBI |
| Bupleurum baldense | GB, VC113 Channel Islands, Jersey, Quennevais | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 14/6/1923 | SLBI |
| Myosotis discolor | GB, VC113 Channel Islands, Jersey, Saint Brelade's Bay | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 12/6/1923 | SLBI |
| Trifolium subterraneum | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | | Watson Botanical Exchange Club William Charles Barton | 15/6/1923 | SLBI |
| Trifolium subterraneum | GB, VC113 Channel Islands, Jersey,La Moye | | Watson Botanical Exchange Club William Charles Barton | 14/6/1923 | SLBI |
| Juncus capitatus | GB, VC113 Channel Islands, Jersey,La Moye | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 14/6/1923 | SLBI |
| Medicago minima | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 14/6/1923 | SLBI |
| Orobanche ritro | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 14/6/1923 | SLBI |
| Orobanche minor var. maritima | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 14/6/1923 | SLBI |
| Matthiola sinuata | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 16/6/1923 18/6/1923 | SLBI |
| Orchis laxiflora | GB, VC113 Channel Islands, Saint Ouen's Pond | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 17/6/1923 | SLBI |
| Juncus bulbosus | IE, VCH16 West Galway, Errisbeg | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 13/8/1913 | SLBI |
| Arabis hirsuta | GB, VC17 Surrey, Epsom Cultivated IE, VCH16 West Galway, Roundstone,Dog's Bay | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 8/1918 | SLBI |
| Circaea lutetiana | IE, VCH28 Co. Sligo, Glencar | William Charles Barton | Watson Botanical Exchange Club William Charles Barton | 20/8/1913 | SLBI |
| Campanula rotundifolia | IE, VCH28 Co. Sligo, Lough Gill | William Charles Barton | Watson Botanical Exchange Club Job Edward Lousley William Charles Barton | 17/8/1913 | SLBI |
| Carex vulpina | GB, VC29 Cambridgeshire, Tadlow | Robert Stephen Adamson | Botanical Exchange Club of The British Isles Robert Stephen Adamson William Charles Barton | 17/5/1912 | BM |
| Carex divisa | GB, VC113 Channel Islands, Saint Ouen's Pond | Louis Arsene | William Charles Barton | 16/6/1925 | BM |
| Carex lachenalii | GB, VC92 South Aberdeenshire, Loch nan Eun | James Backhouse | William Charles Barton | 1849 | BM |
+ | Cuscuta epithymum | GB, VC12 North Hampshire, Ashmansworth | William Charles Barton | Botanical Society & Exchange Club of The British Isles Charles Bailey William Charles Barton | 18/9/1915 | MANCH |
| Symphytum officinale x asperum = S. x uplandicum | GB, VC26 West Suffolk, Mildenhall | William Charles Barton | Watson Botanical Exchange Club Charles Bailey William Charles Barton | 11/6/1914 | MANCH |
| Potamogeton polygonifolius | GB, VC48 Merionethshire, Arthog | William Charles Barton | Watson Botanical Exchange Club Charles Bailey William Charles Barton | 14/6/1915 | MANCH |
| Carex diandra | GB, VC58 Cheshire, Seaman's Moss | John Hardy | Watson Botanical Exchange Club Charles Bailey William Charles Barton | 6/1853 | BM |
| Carex diandra | GB, VC58 Cheshire, Seaman's Moss | John Hardy | Watson Botanical Exchange Club Charles Bailey William Charles Barton Charles Bailey | 6/1853 | BM |
| Erica ciliaris | GB, VC1 West Cornwall, Chynhale | William Charles Barton | William Charles Barton | 25/8/1911 | SLBI |
| Cuscuta epithymum | GB, VC1 West Cornwall, Newlyn, Penzance | William Charles Barton | | 7/8/1911 | K |
| Carex arenaria | GB, VC1 West Cornwall, Perranporth | William Charles Barton | | 5/6/1919 | BM |