| Bupleurum tenuissimum | GB, VC25 East Suffolk, Walberswick | Arthur Reginald Horwood | | 19/9/1934 | K |
| Bupleurum tenuissimum | GB, VC28 West Norfolk, Brancaster | | Allan Octavian Hume | 8/1847 | SLBI |
| Bupleurum tenuissimum | GB, VC28 West Norfolk, Heacham | Eric Frederic Drabble | Eric Frederic Drabble Hilda Lake Drabble | 27/8/1897 | K |
| Bupleurum tenuissimum | GB, VC28 West Norfolk, Heacham | Richard Henry Yapp | | 8/1908 | ABS |
| Bupleurum tenuissimum | GB, VC28 West Norfolk, Heacham | Richard Henry Yapp | | 8/1903 | ABS |
| Bupleurum tenuissimum | GB, VC28 West Norfolk, Heacham | Richard Henry Yapp | | 8/8/1901 | ABS |
| Bupleurum tenuissimum | GB, VC28 West Norfolk, Hunstanton | Henry Collett | James Sykes Gamble | 9/1900 | K |
| Bupleurum tenuissimum | GB, VC28 West Norfolk, Hunstanton | Henry Collett | James Sykes Gamble | 9/1900 | K |
| Bupleurum tenuissimum | GB, VC28 West Norfolk, Titchwell | William Edward Thompson | | 23/8/1901 | K |
| Bupleurum tenuissimum | GB, VC28 West Norfolk, Titchwell | William Edward Thompson | | 8/1901 | K |
| Bupleurum tenuissimum | GB, VC28 West Norfolk, Wolferton | Charles Edward Hubbard | | 7/8/1946 | K |
| Bupleurum tenuissimum | GB, Norfolk | R W Piper | William Hunt Painter | 9/1876 | ABS |
| Bupleurum tenuissimum | GB, VC29 Cambridgeshire, Sutton | Alfred Fryer | | 9/1884 | SLBI |
| Bupleurum tenuissimum | GB, VC29 Cambridgeshire, Sutton | William West | George Stephen West William West | 9/8/1895 | BIRM |
| Bupleurum tenuissimum | GB, VC34 West Gloucestershire, Bristol,Shirehampton | | Robert Large Baker | 1825 | BIRM |
| Bupleurum tenuissimum | GB, VC34 West Gloucestershire, Durdham Down | Harold Stuart Thompson | Watson Botanical Exchange Club Albert John Crosfield Harold Stuart Thompson | 20/8/1922 | BIRM |
| Bupleurum tenuissimum | GB, VC34 West Gloucestershire, Durdham Down | Harold Stuart Thompson | Harold Stuart Thompson | 20/8/1922 | BIRM |
| Bupleurum tenuissimum | GB, VC34 West Gloucestershire, Durdham Down | Harold Stuart Thompson | Isaac A Helsby | 20/8/1922 | SLBI |
| Bupleurum tenuissimum | GB, VC34 West Gloucestershire, New Passage | Clifford Charles Townsend | Clifford Charles Townsend | 8/9/1952 | K |
| Bupleurum tenuissimum | GB, VC34 West Gloucestershire, Oldbury-on-Severn | Herbert Kenneth Airy Shaw | | 12/8/1944 | K |
| Bupleurum tenuissimum | GB, VC34 West Gloucestershire, Shirehampton | W E Green | | 9/1877 | K |
| Bupleurum tenuissimum | GB, VC34 West Gloucestershire, Shirehampton | J W | George Lloyd | 1825 | K |
| Bupleurum tenuissimum | GB, VC35 Monmouthshire, Magor | William Andrew Shoolbred | Augustin Ley William Andrew Shoolbred | 10/9/1894 | BIRM |
| Bupleurum tenuissimum | GB, VC35 Monmouthshire, Rumney | Arthur Edward Wade | National Museum of Wales | 3/8/1955 | K |
| Bupleurum tenuissimum | GB, VC37 Worcestershire, Malvern | Albert John Hambrough | Allan Octavian Hume Frederick Townsend | 8/1845 | SLBI |
| Bupleurum tenuissimum | GB, VC37 Worcestershire, Malvern | T J Wall | Botanical Exchange Club of The British Isles Charles Edward Britton | 3/8/1922 | K |
| Bupleurum tenuissimum | GB, VC37 Worcestershire, Malvern Link | Eleonora Armitage | | 8/1892 | ABS |
| Bupleurum tenuissimum | GB, VC37 Worcestershire, Malvern Link | Richard Charles L'Estrange Burges | | 13/9/1934 | BIRM |
| Bupleurum tenuissimum | GB, VC37 Worcestershire, Malvern Link Common | Eleonora Armitage | | 8/1892 | K |
| Bupleurum tenuissimum | GB, VC37 Worcestershire, Malvern Link Common | Albert Bruce Jackson Spencer Henry Bickham | Albert Bruce Jackson | 16/8/1910 | K |
| Bupleurum tenuissimum | GB, VC37 Worcestershire, Malvern Link Common | Harry Joseph Riddelsdell | | 5/10/1909 | K |
| Bupleurum tenuissimum | GB, VC37 Worcestershire, Malvern Link Common | Alfred Rayney Waller Richard Francis Towndrow | Harold Stuart Thompson | 7/1884 | BIRM |
| Bupleurum tenuissimum | GB, VC41 Glamorganshire, Cardiff | Wilson Crosfield Worsdell | George Valentine Chapman Last | 7/1926 | K |
| Bupleurum tenuissimum | GB, VC41 Glamorganshire, Cardiff | Harry Joseph Riddelsdell | Botanical Exchange Club of The British Isles Augustin Ley | 16/9/1908 | BIRM |
| Bupleurum tenuissimum | GB, VC41 Glamorganshire, East Aberthaw | Isaac A Helsby | Isaac A Helsby | 12/7/1934 | SLBI |
| Bupleurum tenuissimum | GB, VC41 Glamorganshire, Penarth | Harold Stuart Thompson | Harold Stuart Thompson | 25/8/1920 | BIRM |
| Bupleurum tenuissimum | GB, VC53 South Lincolnshire, Boston | F Kime Samuel John Hurst | | 7/9/1936 | K |
| Bupleurum tenuissimum | GB, VC54 North Lincolnshire, Cleethorpes | Albert Bullock | | 8/1930 | K |
| Bupleurum tenuissimum | GB, VC54 North Lincolnshire, Cleethorpes | Albert Bullock | | 8/1930 | K |
| Bupleurum tenuissimum | GB, VC54 North Lincolnshire, Humberston | Albert Bullock | | 8/1930 | K |
| Bupleurum tenuissimum | GB, VC54 North Lincolnshire, Humberston | Arthur Allman Bullock B E Bullock | | 7/9/1931 | K |
| Bupleurum tenuissimum | GB, VC54 North Lincolnshire, Humberston | Arthur Allman Bullock | | 7/9/1931 | K |
| Bupleurum tenuissimum | GB, VC60 West Lancashire, Fleetwood | John Thomas Irvine Boswell-Syme | | 9/1841 | K |
| Bupleurum tenuissimum | GB, Lancashire, Preston | John Joseph Bennett | Croydon Natural History and Scientific Society John Joseph Bennett Robert Russell Hutchinson | 1830 | SLBI |
| Bupleurum tenuissimum | GB, VC61 South-east Yorkshire, Paull | William Booth Waterfall | Botanical Exchange Club of The British Isles George Claridge Druce | 9/1898 | K |
| Bupleurum tenuissimum | GB, VC61 South-east Yorkshire, Paull Holme | Charles Waterfall | Croydon Natural History and Scientific Society Watson Botanical Exchange Club Henry Franklin Parsons Tom Petch | 9/1900 | SLBI |
| Bupleurum tenuissimum | GB, VC61 South-east Yorkshire, Paull Holme | Charles Waterfall Tom Petch | Watson Botanical Exchange Club Albert Bruce Jackson Charles Waterfall | 9/1900 | K |
| Bupleurum tenuissimum | GB, VC62,VC64, River Swale | A E Webb | | 8/1932 | K |
| Bupleurum tenuissimum | GB, VC113 Channel Islands, Guernsey | | Allan Octavian Hume | 9/1880 | SLBI |