| Potamogeton lucens x perfoliatus = P. x salicifolius | GB, VC29 Cambridgeshire, Welches Dam | Alfred Fryer | Botanical Society & Exchange Club of The British Isles Alfred Fryer William Hadden Beeby | 27/6/1884 to 8/1884 | SLBI |
| Potamogeton natans | GB, VC111 Orkney, Birsay | Henry Halcro Johnston | Botanical Society & Exchange Club of The British Isles Henry Halcro Johnston | 9/1885 | SLBI |
| Potamogeton natans | IE, VCH1 South Kerry, Killarney | Reginald Wiliam Scully | Botanical Society & Exchange Club of The British Isles Reginald Wiliam Scully William Hadden Beeby | 6/8/1887 | SLBI |
| Potamogeton natans x lucens = P. x fluitans | GB, VC31 Huntingdonshire, Ramsey Cultivated | Alfred Fryer | Botanical Society & Exchange Club of The British Isles Alfred Fryer William Hadden Beeby | 17/7/1888 | SLBI |
| Potamogeton natans x lucens = P. x fluitans | GB, VC46 Cardiganshire, Aberarth | Edward Shearburn Marshall | Botanical Society & Exchange Club of The British Isles | 23/8/1899 | ABS |
| Potamogeton nodosus | GB, VC9 Dorset, Child Okeford | Patrick Martin Hall | Botanical Society & Exchange Club of The British Isles Patrick Martin Hall | 3/8/1936 | SLBI |
| Potamogeton obtusifolius | GB, VC58 Cheshire, Mouldsworth | Charles Waterfall | Botanical Society & Exchange Club of The British Isles | 14/9/1915 | MANCH |
| Potamogeton pectinatus | GB, VC83 Midlothian, Duddingston Loch | Charles Bailey | Botanical Society & Exchange Club of The British Isles Charles Bailey | 12/8/1882 | ABS |
| Potamogeton pectinatus | GB, VC111 Orkney, Loch of Kirbister | John Thomas Irvine Boswell-Syme | Botanical Society & Exchange Club of The British Isles Allan Octavian Hume Frederick Townsend | 8/1880 | SLBI |
| Potamogeton polygonifolius | GB, VC19 North Essex, Tiptree Heath | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 6/5/1920 | MANCH |
| Potamogeton polygonifolius | GB, VC50 Denbighshire, Wrexham | Charles Waterfall | Botanical Society & Exchange Club of The British Isles Charles Waterfall | 24/9/1917 | MANCH |
| Potamogeton praelongus | GB, VC69 Westmorland, Grasmere | Henry Elliott Fox | Botanical Society & Exchange Club of The British Isles Augustin Ley | 8/1890 | BIRM |
| Potamogeton pusillus | GB, VC14 East Sussex, Lewes | George Claridge Druce | Botanical Society & Exchange Club of The British Isles George Claridge Druce | 21/6/1925 | MANCH |
| Potamogeton pusillus | GB, VC111 Orkney, Mainland, Loch of Ayre | Henry Halcro Johnston | Botanical Society & Exchange Club of The British Isles | 28/8/1937 | MANCH |
| Potentilla erecta x anglica = P. x suberecta | GB, VC17 Surrey, Banstead | Charles Edward Britton | Botanical Society & Exchange Club of The British Isles Charles Edward Britton | 29/6/1930 | MANCH |
| Potentilla erecta x anglica = P. x suberecta | GB, VC19 North Essex, Henny | George Charles Brown | Botanical Society & Exchange Club of The British Isles Charles Bailey | 4/7/1915 | MANCH |
+ | Puccinellia fasciculata | GB, VC17 Surrey | Rowland John Burdon | Botanical Society & Exchange Club of The British Isles Charles Bailey | 10/6/1916 | MANCH |
+ | Pyrola rotundifolia subsp. rotundifolia | GB, VC68 North Northumberland, Newham | Patrick Martin Hall William Arthur Sledge | Botanical Society & Exchange Club of The British Isles Patrick Martin Hall William Harold Pearsall | 27/6/1934 | MANCH |
| Ranunculus acris | GB, VC34 West Gloucestershire, Hallen | James Walter White | Botanical Society & Exchange Club of The British Isles | 27/5/1926 | MANCH |
| Ranunculus bulbosus | GB, VC34 West Gloucestershire, Redland | Ida Mary Roper | Botanical Society & Exchange Club of The British Isles Ida Mary Roper | 30/8/1924 | MANCH |
| Ranunculus bulbosus | GB, VC69 Westmorland, Askam | Dennis Lumb | Botanical Society & Exchange Club of The British Isles | 15/6/1914 | MANCH |
| Ranunculus peltatus | GB, VC6 North Somerset, Barrow Hill | James Walter White | Botanical Society & Exchange Club of The British Isles James Walter White Job Edward Lousley | 27/5/1927 | SLBI |
| Ranunculus peltatus | GB, VC27 East Norfolk, Burgh St Margaret | Rowland John Burdon | Botanical Society & Exchange Club of The British Isles Job Edward Lousley | 11/7/1929 20/7/1929 | SLBI |
| Ranunculus penicillatus subsp. pseudofluitans | GB, VC6 North Somerset, Cheddar | James Walter White | Botanical Society & Exchange Club of The British Isles Job Edward Lousley | 7/6/1929 | SLBI |
| Raphanus raphanistrum subsp. maritimus | GB, VC113 Channel Islands, Jersey, Saint Heliers | Louis Arsene | Botanical Society & Exchange Club of The British Isles Isaac A Helsby | 1/7/1928 | SLBI |
| Reseda lutea | GB, VC57 Derbyshire, Trent Pool | R Bulley | Botanical Society & Exchange Club of The British Isles R Bulley | 31/7/1931 | SLBI |
| Rhinanthus minor subsp. minor | GB, VC7 North Wiltshire, Bishopstone | | Botanical Society & Exchange Club of The British Isles Joseph Donald Grose | 20/6/1946 | SLBI |
+ | Romulea columnae | GB, VC113 Channel Islands, Jersey,Ouaisne | Louis Arsene | Botanical Society & Exchange Club of The British Isles | 3/3/1926 | MANCH |
+ | Rosa agrestis | GB, VC14 East Sussex, Lewes | James Herbert Augustus Jenner | Botanical Society & Exchange Club of The British Isles Charles Bailey James Herbert Augustus Jenner | | MANCH |
+ | Rosa agrestis | GB, VC17 Surrey, Guildford (Sw of),Puttenham | Henry Groves James Groves | Botanical Society & Exchange Club of The British Isles Charles Bailey Henry & James Groves | | MANCH |
| Rubus anisacanthos | GB, VC19 North Essex, East Donyland | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 8/7/1936 | SLBI |
| Rubus cotteswoldensis | GB, VC33 East Gloucestershire, Bourton | Harry Joseph Riddelsdell | Botanical Society & Exchange Club of The British Isles Charles Edward Britton | 18/8/1921 | SLBI |
| Rubus criniger | GB, VC19 North Essex, Layer de la Haye | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 10/7/1938 | SLBI |
| Rubus iceniensis | GB, VC19 North Essex, Berechurch | George Charles Brown | Botanical Society & Exchange Club of The British Isles Charles Edward Britton George Charles Brown | 10/7/1933 | SLBI |
| Rubus plicatus | GB, VC19 North Essex, Stanway | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 11/7/1933 | SLBI |
| Rubus subintegribasis | GB, VC11 South Hampshire, Alum Chine, Bournemouth | William Moyle Rogers | Botanical Society & Exchange Club of The British Isles | 29/7/1901 | SLBI |
| Rubus ulmifolius | GB, VC6 North Somerset, Axbridge | James Walter White | Botanical Society & Exchange Club of The British Isles | 24/9/1882 | SLBI |
| Rubus winteri | GB, VC19 North Essex, Stanway | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 11/7/1933 | SLBI |
| Rumex conglomeratus | GB, VC1 West Cornwall, Perranzabuloe,Lambourne Hill | Francis Rilstone | Botanical Society & Exchange Club of The British Isles | 31/7/1945 | SLBI |
| Rumex conglomeratus | GB, VC1 West Cornwall, Perranzabuloe,Lambourne Hill | Francis Rilstone | Botanical Society & Exchange Club of The British Isles | 31/7/1945 | SLBI |