| Helleborus viridis subsp. occidentalis | GB, VC2 East Cornwall, Launceston | William Wise | William Wise | 3/1888 | LAUS |
| Helleborus viridis subsp. occidentalis | GB, VC3 South Devon, Plymouth | William Booth Waterfall | Charles Bailey | 2/1877 | 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, 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, VC6 North Somerset, Bristol | George Henry Kendrick Thwaites | George Henry Kendrick Thwaites | 4/1842 | MANCH |
| 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 | William E Green | Charles Bailey | 2/1877 4/1877 | 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 | Harold Stuart Thompson Newman Neild | Harold Stuart Thompson | 17/3/1918 | BIRM |
| 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, 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, 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, VC7 North Wiltshire, Monkton Farleigh | Frederick Thompson Mott | Charles Bailey Frederick Thompson Mott Thomas Thorp | 3/1893 | 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, VC7 North Wiltshire, Ogbourne | | Botanical Society & Exchange Club of The British Isles Joseph Donald Grose | 22/4/1934 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC16 West Kent, Eynsford | Frederic Henry Ward | Harold Stuart Thompson | 4/5/1891 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC17 Surrey, Mickleham | James Alexander Brewer | John Harbord Lewis | 5/1857 | MANCH |
| 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, VC20 Hertfordshire, Watford | Irvine | Charles Bailey | 4/1869 | 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, 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 | Charles Bailey George Claridge Druce | 5/1887 | 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, VC22 Berkshire, Harwell | Robert Southey Hill | Robert Southey Hill William Wilson | | MANCH |
| 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, VC29 Cambridgeshire, Cambridge | Marmaduke Alexander Lawson | Charles Bailey John Harbord Lewis | 1862 | 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, VC29 Cambridgeshire, Coton | John Stevens Henslow | William Wilson | 13/3/1826 to 31/3/1826 | MANCH |
| 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, VC33 East Gloucestershire, Painswick | | | 1894 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC33 East Gloucestershire, Painswick | | | 1894 | 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, VC36 Herefordshire, Clehonger | Holloway Augustin Ley | Augustin Ley | 15/6/1880 | BIRM |