| Helleborus viridis subsp. occidentalis | GB, VC70 Cumberland, Kentmere | Thomas Barker | | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC69 Westmorland, Arnside | John Barrow | Charles Bailey John Barrow | 7/1873 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC65 North-west Yorkshire, Richmond | James Ward | Hewett Cottrell Watson William Wilson | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC65 North-west Yorkshire, Richmond | James Ward | William Wilson | 19/4/1837 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC64 Mid-west Yorkshire, Wetherby | H R Moiser | | 4/1877 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC64 Mid-west Yorkshire, Wetherby | H R Moiser William West | George Stephen West William West | 4/1877 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC64 Mid-west Yorkshire, Wetherby | H R Moiser | George Stephen West William West | 4/1877 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC64 Mid-west Yorkshire, Thorner | William West | George Stephen West William West | 6/1878 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC64 Mid-west Yorkshire, Becca Banks, Aberford | | | 28/4/1906 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC64 Mid-west Yorkshire, Becca Banks, Aberford | H R Craven | | 28/4/1906 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC64 Mid-west Yorkshire, Aberford, Becca | H L Craven | | 8/4/1905 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC64 Mid-west Yorkshire, Aberford | H E Craven | | 17/6/1906 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC64 Mid-west Yorkshire, Aberford | H L Craven | | 28/4/1906 to 17/6/1906 | MANCH |
| 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 |
| Helleborus viridis subsp. occidentalis | GB, VC62 North-east Yorkshire, West Ayton, Scarborough | Langley Kitching | | 4/4/1890 | BIRM |
| 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, Castle Howard | Henry Ibbotson | Charles Bailey John Ray Hardy | 1842 | MANCH |
| 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, Beckdale | Douglas Montague Heath | Douglas Montague Heath | 3/1909 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Youlgreave | William Wilson | | 4/1831 | 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 William West | 11/4/1884 | 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 | | BIRM |
| 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, Miller's Dale | Charles Bailey | Charles Bailey | 5/4/1876 | 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, Lathkill | | | | MANCH |
| 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, 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, Lincolnshire, Lincoln | | Fletcher | 5/1847 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC40 Shropshire, Bowhills Dingle | Langley Kitching | Langley Kitching | 4/2/1898 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC39 Staffordshire, Ilam | John Edward Sunderland | William Hunt Painter | 5/1877 | MANCH |