| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, Clehonger | Holloway Augustin Ley | Augustin Ley | 15/6/1880 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, Garway Hill, White Rocks | Augustin Ley | | 24/3/1881 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, Great Doward | Charles Bailey | | 21/5/1875 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, Great Doward | William Henry Purchas | Augustin Ley | 31/7/1889 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, Howle Hill | Agnes Gee Edith Gee | Augustin Ley | 1880 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, Little Doward | Augustin Ley | Augustin Ley | 1/6/1910 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, Orcop | Augustin Ley | Augustin Ley | 4/5/1886 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, River Wye | Charles Bailey | | 21/5/1875 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC35 Monmouthshire, Llanthony Abbey GB, VC36 Herefordshire, Sellack Cultivated | Augustin Ley | Augustin Ley | 21/4/1881 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC37 Worcestershire, Broadway | | Birmingham Natural History and Philosophical Society | 21/4/1889 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC38 Warwickshire, Allesley | | John Wilson Rimington | 1843 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC38 Warwickshire, Hampton on the Hill | William Henry Purchas | | 4/1874 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC38 Warwickshire, Studley | Thomas Kirk | George Stephen West Thomas Kirk | 5/1850 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC39 Staffordshire, Ilam | John Edward Sunderland | William Hunt Painter | 5/1877 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC40 Shropshire, Bowhills Dingle | Langley Kitching | Langley Kitching | 4/2/1898 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, Lincolnshire, Lincoln | | Fletcher | 5/1847 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Ashwood Dale | Augustin Ley | Augustin Ley | 18/3/1868 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Ashwood Dale | Augustin Ley | Augustin Ley | 14/5/1868 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Ashwood Dale | Augustin Ley | Augustin Ley | 14/5/1868 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Buxton | Spencer Henry Bickham | Charles Bailey | 1/5/1868 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Buxton | Spencer Henry Bickham | Charles Bailey John Barrow | 6/1868 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Lathkill | | | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Mapleton | Charles Bailey | | 31/5/1863 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Mapleton | Charles Bailey | Charles Bailey | 31/5/1863 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Miller's Dale | Charles Bailey | Charles Bailey | 5/4/1876 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Miller's Dale | Charles Bailey | Charles Bailey | 5/8/1876 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Wormhill | William Isaac Hannan | William Hunt Painter | 7/1879 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Wormhill | William West | George Stephen West | | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Wormhill | William West | William West | 5/1879 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Wormhill | William West | William West | 5/1880 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Wormhill | William West | George Stephen West William West | 11/4/1884 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Youlgreave | William Wilson | | 4/1831 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC62 North-east Yorkshire, Beckdale | Douglas Montague Heath | Douglas Montague Heath | 3/1909 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC62 North-east Yorkshire, Brompton | James Ward | William Wilson | 22/3/1836 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC62 North-east Yorkshire, Castle Howard | Henry Ibbotson | Charles Bailey John Ray Hardy | 1842 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC62 North-east Yorkshire, Helmsley | John Gilbert Baker | John Gilbert Baker John Ray Hardy | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC62 North-east Yorkshire, Helmsley | George Nicholson | William Hillhouse | 19/4/1878 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC62 North-east Yorkshire, West Ayton, Scarborough | Langley Kitching | | 4/4/1890 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC63 South-west Yorkshire, Conisborough | H L Craven | Manchester Museum | 13/5/1906 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC63 South-west Yorkshire, Conisborough | H L Craven | | 13/5/1906 | MANCH |