| Helleborus viridis subsp. occidentalis | GB, VC22 Berkshire, Harwell | Robert Southey Hill | Robert Southey Hill William Wilson | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC30 Bedfordshire | Mary Ann Brooks | | | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Lathkill | | | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Wormhill | William West | George Stephen West | | 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, VC65 North-west Yorkshire, Richmond | James Ward | Hewett Cottrell Watson William Wilson | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC70 Cumberland, Kentmere | Thomas Barker | | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC29 Cambridgeshire, Coton | John Stevens Henslow | William Wilson | 13/3/1826 to 31/3/1826 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Youlgreave | William Wilson | | 4/1831 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC62 North-east Yorkshire, Brompton | James Ward | William Wilson | 22/3/1836 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC65 North-west Yorkshire, Richmond | James Ward | William Wilson | 19/4/1837 | 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, VC6 North Somerset, Bristol | George Henry Kendrick Thwaites | George Henry Kendrick Thwaites | 4/1842 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC6 North Somerset, Leigh Woods | Leopold Hartley Grindon | Charles Bailey William Lowndes Notcutt | 4/1842 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC6 North Somerset, Leigh Woods | George Henry Kendrick Thwaites | John Bland Wood William Wilson | 4/1842 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC38 Warwickshire, Allesley | | John Wilson Rimington | 1843 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, Lincolnshire, Lincoln | | Fletcher | 5/1847 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC38 Warwickshire, Studley | Thomas Kirk | George Stephen West Thomas Kirk | 5/1850 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC6 North Somerset, Leigh | Martha Maria Atwood | George Stephen West | 15/4/1852 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC17 Surrey, Mickleham | James Alexander Brewer | John Harbord Lewis | 5/1857 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC7 North Wiltshire, Monkton Farleigh | Spencer Henry Bickham | John Wilson Rimington Spencer Henry Bickham | 30/3/1859 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC33 East Gloucestershire, Cotswold Hills | J Pumphrey | | 2/7/1860 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC33 East Gloucestershire, Cotswold Hills | J Pumphrey | J Pumphrey | 2/7/1860 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC29 Cambridgeshire, Cambridge | Marmaduke Alexander Lawson | Charles Bailey John Harbord Lewis | 1862 | 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, Ashwood Dale | Augustin Ley | Augustin Ley | 18/3/1868 | 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, 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 John Barrow | 6/1868 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC20 Hertfordshire, Watford | Irvine | Charles Bailey | 4/1869 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC69 Westmorland, Arnside | John Barrow | Charles Bailey John Barrow | 7/1873 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, Devon, Plymouth | William Booth Waterfall | Harold Stuart Thompson | 3/1874 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC38 Warwickshire, Hampton on the Hill | William Henry Purchas | | 4/1874 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, Great Doward | Charles Bailey | | 21/5/1875 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, River Wye | Charles Bailey | | 21/5/1875 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC6 North Somerset, Roman Camp, Leigh Woods | William E Green | Charles Bailey John Harbord Lewis | 2/1876 3/1876 | 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, Miller's Dale | Charles Bailey | Charles Bailey | 5/8/1876 | MANCH |