| 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, 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, 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, VC64 Mid-west Yorkshire, Aberford, Becca | H L Craven | | 8/4/1905 | MANCH |
| 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, 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, VC70 Cumberland, Kentmere | Thomas Barker | | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC2 East Cornwall, Launceston | William Wise | William Wise | 3/1888 | LAUS |
| Helleborus viridis subsp. occidentalis | GB, Devon, Plymouth | William Booth Waterfall | Harold Stuart Thompson | 3/1874 | 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, VC6 North Somerset, Leigh Woods | Harold Stuart Thompson Newman Neild | Harold Stuart Thompson | 17/3/1918 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC6 North Somerset, Sidcot | Harold Stuart Thompson | Harold Stuart Thompson | 24/3/1921 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC6 North Somerset, Winterhead | Harold Stuart Thompson | Harold Stuart Thompson | 4/4/1915 to 12/6/1915 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC6 North Somerset, Winterhead Farm | Harold Stuart Thompson | Harold Stuart Thompson | 4/4/1915 12/6/1915 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC16 West Kent, Eynsford | Frederic Henry Ward | Harold Stuart Thompson | 4/5/1891 | 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 |
| 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, VC24 Buckinghamshire, Ellesborough | Frances Louisa Foord-Kelcey | Watson Botanical Exchange Club Augustin Ley Frances Louisa Foord-Kelcey | 3/1910 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC30 Bedfordshire | Mary Ann Brooks | | | BIRM |
| 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, VC36 Herefordshire, Clehonger | Holloway Augustin Ley | Augustin Ley | 15/6/1880 | BIRM |
| 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 | 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, 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, 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, VC40 Shropshire, Bowhills Dingle | Langley Kitching | Langley Kitching | 4/2/1898 | BIRM |
| 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 |