| Helleborus viridis subsp. occidentalis | GB, VC3 South Devon, Plymouth | William Booth Waterfall | Charles Bailey | 2/1877 | 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, 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 |
| 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, VC39 Staffordshire, Ilam | John Edward Sunderland | William Hunt Painter | 5/1877 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC62 North-east Yorkshire, Helmsley | George Nicholson | William Hillhouse | 19/4/1878 | 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, VC57 Derbyshire, Wormhill | William West | William West | 5/1879 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Wormhill | William Isaac Hannan | William Hunt Painter | 7/1879 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, Howle Hill | Agnes Gee Edith Gee | Augustin Ley | 1880 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Wormhill | William West | William West | 5/1880 | 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, 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, VC35 Monmouthshire, Llanthony Abbey GB, VC36 Herefordshire, Sellack Cultivated | Augustin Ley | Augustin Ley | 21/4/1881 | BIRM |
| 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, VC36 Herefordshire, Orcop | Augustin Ley | Augustin Ley | 4/5/1886 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC22 Berkshire, Basildon | George Claridge Druce | Charles Bailey George Claridge Druce | 5/1887 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC2 East Cornwall, Launceston | William Wise | William Wise | 3/1888 | LAUS |
| Helleborus viridis subsp. occidentalis | GB, VC37 Worcestershire, Broadway | | Birmingham Natural History and Philosophical Society | 21/4/1889 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC36 Herefordshire, Great Doward | William Henry Purchas | Augustin Ley | 31/7/1889 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC62 North-east Yorkshire, West Ayton, Scarborough | Langley Kitching | | 4/4/1890 | 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, VC6 North Somerset, Abbots Leigh | James Walter White | James Walter White | 18/2/1892 | 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, VC33 East Gloucestershire, Painswick | | | 1894 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC33 East Gloucestershire, Painswick | | | 1894 | 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, VC40 Shropshire, Bowhills Dingle | Langley Kitching | Langley Kitching | 4/2/1898 | BIRM |
| 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, 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, 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, VC63 South-west Yorkshire, Conisborough | H L Craven | Manchester Museum | 13/5/1906 | MANCH |