| 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 |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Ashwood Dale | Augustin Ley | Augustin Ley | 14/5/1868 | 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, 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, VC62 North-east Yorkshire, Beckdale | Douglas Montague Heath | Douglas Montague Heath | 3/1909 | BIRM |
| 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, VC64 Mid-west Yorkshire, Thorner | William West | George Stephen West William West | 6/1878 | BIRM |
| 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 |