| 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, VC2 East Cornwall, Launceston | William Wise | William Wise | 3/1888 | LAUS |
| 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, VC6 North Somerset, Abbots Leigh | James Walter White | James Walter White | 18/2/1892 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC6 North Somerset, Abbots Leigh | James Walter White | | 3/1884 | 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, 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 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, VC6 North Somerset, Leigh | Martha Maria Atwood | George Stephen West | 15/4/1852 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC38 Warwickshire, Studley | Thomas Kirk | George Stephen West Thomas Kirk | 5/1850 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC65 North-west Yorkshire, Richmond | James Ward | Hewett Cottrell Watson William Wilson | | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC34 West Gloucestershire, Kilcott | Charles L Walton | | 3/1905 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC34 West Gloucestershire, Kilcott | Charles L Walton | Manchester Museum (Owens College) | 4/1905 | 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, Devon, Plymouth | William Booth Waterfall | Harold Stuart Thompson | 3/1874 | 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, VC7 North Wiltshire, Monkton Farleigh | Spencer Henry Bickham | John Wilson Rimington Spencer Henry Bickham | 30/3/1859 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC38 Warwickshire, Allesley | | John Wilson Rimington | 1843 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC38 Warwickshire, Hampton on the Hill | William Henry Purchas | | 4/1874 | 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, VC39 Staffordshire, Ilam | John Edward Sunderland | William Hunt Painter | 5/1877 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Wormhill | William Isaac Hannan | William Hunt Painter | 7/1879 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC64 Mid-west Yorkshire, Wetherby | H R Moiser | | 4/1877 | 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, 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 |