| Helleborus viridis subsp. occidentalis | GB, VC33 East Gloucestershire, Painswick | | | 1894 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC33 East Gloucestershire, Painswick | | | 1894 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Lathkill | | | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC64 Mid-west Yorkshire, Becca Banks, Aberford | | | 28/4/1906 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC37 Worcestershire, Broadway | | Birmingham Natural History and Philosophical Society | 21/4/1889 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC22 Berkshire, Basildon | George Claridge Druce | Botanical Exchange Club Charles Bailey | 5/1877 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC22 Berkshire, Basildon | George Claridge Druce | Botanical Exchange Club Charles Bailey | 5/1877 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC29 Cambridgeshire, Caxton Gibbet,Swanley Wood | Reginald Henry Goode | Watson Botanical Exchange Club George Goode | 3/4/1914 | 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, 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, VC62 North-east Yorkshire, Castle Howard | Henry Ibbotson | Charles Bailey John Ray Hardy | 1842 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC3 South Devon, Plymouth | William Booth Waterfall | Charles Bailey | 2/1877 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, River Wye | Charles Bailey | | 21/5/1875 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC6 North Somerset, Leigh Woods | William E Green | Charles Bailey | 2/1877 4/1877 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC7 North Wiltshire, Monkton Farleigh | Frederick Thompson Mott | Charles Bailey Frederick Thompson Mott Thomas Thorp | 3/1893 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Mapleton | Charles Bailey | | 31/5/1863 | 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, VC29 Cambridgeshire, Cambridge | Marmaduke Alexander Lawson | Charles Bailey John Harbord Lewis | 1862 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Mapleton | Charles Bailey | Charles Bailey | 31/5/1863 | 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, VC22 Berkshire, Basildon | George Claridge Druce | Charles Bailey George Claridge Druce | 5/1887 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, Great Doward | Charles Bailey | | 21/5/1875 | 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, VC70 Cumberland, Kentmere | Thomas Barker | | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Buxton | Spencer Henry Bickham | Charles Bailey John Barrow | 6/1868 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC69 Westmorland, Arnside | John Barrow | Charles Bailey John Barrow | 7/1873 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC30 Bedfordshire | Mary Ann Brooks | | | BIRM |
| 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, Becca | H L Craven | | 8/4/1905 | 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, VC64 Mid-west Yorkshire, Becca Banks, Aberford | H R Craven | | 28/4/1906 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC22 Berkshire, Basildon Park | George Claridge Druce | Botanical Exchange Club of The British Isles Augustin Ley George Claridge Druce | 5/1897 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, Lincolnshire, Lincoln | | Fletcher | 5/1847 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC7 North Wiltshire, Ogbourne | | Botanical Society & Exchange Club of The British Isles Joseph Donald Grose | 22/4/1934 | 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, VC19 North Essex, Bush End | Douglas Montague Heath | Douglas Montague Heath | 31/3/1921 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC19 North Essex, Bush End | Douglas Montague Heath | Douglas Montague Heath | 31/3/1921 | BIRM |