| Zostera noltei | GB, VC2 East Cornwall, Fowey | Herbert William Pugsley | Watson Botanical Exchange Club | 22/9/1933 | SLBI |
| Zostera noltei | GB, VC2 East Cornwall, Golant | Herbert William Pugsley | Watson Botanical Exchange Club Harold Stuart Thompson Herbert William Pugsley | 22/9/1933 | BIRM |
| Zostera noltei | IE, VCH38 Co. Down, Greyabbey | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell | 7/9/1918 | SLBI |
| Zostera nana | GB, VC101 Kintyre, Loch Sween | Charles Edgar Salmon | Watson Botanical Exchange Club Charles Edgar Salmon Harold Stuart Thompson | 8/8/1899 | BIRM |
+ | Zostera marina | GB, VC82 East Lothian, Aberlady Bay | McTaggert Cowan | Watson Botanical Exchange Club McTaggert Cowan | 13/8/1910 | MANCH |
| Zannichellia polycarpa | IE, VCH38 Co. Down, Belfast | Coslett Herbert Waddell | Croydon Natural History and Scientific Society Watson Botanical Exchange Club Coslett Herbert Waddell Henry Franklin Parsons | 8/1900 | SLBI |
| Zannichellia pedunculata | GB, VC13 West Sussex, Pagham GB, VC13 West Sussex, Sidlesham | Joseph Edward Little | Watson Botanical Exchange Club Joseph Edward Little William Robert Sherrin | 15/6/1914 | SLBI |
| Zannichellia palustris | GB, VC9 Dorset, Wyke Regis | Edward Charles Wallace | Watson Botanical Exchange Club Edward Charles Wallace Job Edward Lousley | 14/6/1928 | SLBI |
| Zannichellia palustris var. repens | GB, VC9 Dorset, Wyke Regis | Edward Charles Wallace | Watson Botanical Exchange Club Edward Charles Wallace | 14/6/1928 | SLBI |
| Zannichellia palustris | GB, VC11 South Hampshire, Keyhaven | J Comber | Watson Botanical Exchange Club William Robert Sherrin | 6/1913 | SLBI |
| Zannichellia palustris | GB, VC29 Cambridgeshire, Cambridge | Alfred James Wilmott | Watson Botanical Exchange Club Alfred James Wilmott Augustin Ley | 31/10/1910 | BIRM |
| Zannichellia palustris | IE, VCH38 Co. Down, Belfast | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | 8/1898 | BIRM |
| Woodsia alpina | GB, VC88 Mid Perthshire, Beinn Heasgarnich | Peter Ewing | Watson Botanical Exchange Club Augustin Ley Peter Ewing | 4/1908 | BIRM |
+ | Woodsia alpina | GB, VC88 Mid Perthshire, Killin,Lochan na Lairige | McTaggert Cowan | Watson Botanical Exchange Club Charles Bailey McTaggert Cowan | 3/8/1906 | MANCH |
| Woodsia alpina | GB, VC88 Mid Perthshire, Loch na Lairige | McTaggert Cowan | Watson Botanical Exchange Club McTaggert Cowan | 4/8/1907 | BIRM |
| Wolffia arrhiza | GB, VC6 North Somerset, Burnham | Ida Mary Roper | Watson Botanical Exchange Club Harold Stuart Thompson Ida Mary Roper | 23/9/1915 | BIRM |
| Wolffia arrhiza | GB, VC13 West Sussex, North Stoke | Charles Edgar Salmon | Watson Botanical Exchange Club Charles Edgar Salmon Harold Stuart Thompson | 3/9/1901 | BIRM |
| Wolffia arrhiza | GB, VC13 West Sussex, North Stoke | Charles Edgar Salmon | Croydon Natural History and Scientific Society Watson Botanical Exchange Club Charles Edgar Salmon Henry Franklin Parsons | 3/9/1901 | SLBI |
| Wahlenbergia hederacea | GB, VC35 Monmouthshire, Earlswood | Whitley | Watson Botanical Exchange Club Job Edward Lousley National Museum of Wales | 2/9/1918 | SLBI |
| Wahlenbergia hederacea | GB, VC35 Monmouthshire, Earlswood | Whitley | National Museum of Wales Watson Botanical Exchange Club | 2/9/1918 | SLBI |
| Vulpia myuros | GB, VC34 West Gloucestershire, Clifton | James Walter White | Watson Botanical Exchange Club Harold Stuart Thompson James Walter White | 10/7/1911 | BIRM |
| Vulpia membranacea | GB, VC3 South Devon, Exmouth | William Robert Sherrin | Watson Botanical Exchange Club Harold Stuart Thompson William Robert Sherrin | 6/1918 | BIRM |
| Vulpia ciliata subsp. ambigua | GB, VC26 West Suffolk, Mildenhall | William Charles Barton | Watson Botanical Exchange Club Harold Stuart Thompson | 12/6/1916 | BIRM |
| Vulpia bromoides | GB, VC17 Surrey, Mitcham Common | David Guthrie Catcheside | Watson Botanical Exchange Club David Guthrie Catcheside Harold Stuart Thompson | 6/7/1926 | BIRM |
| Viscum album | GB, VC6 North Somerset, Congresbury | Ida Mary Roper | Watson Botanical Exchange Club Ida Mary Roper William Robert Sherrin | 4/4/1910 | SLBI |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Watson Botanical Exchange Club | 10/1930 11/1930 | SLBI |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 10/1930 to 11/1930 | BIRM |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club | 1/9/1930 | SLBI |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Job Edward Lousley | 9/1930 10/1930 | SLBI |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 8/9/1930 to 24/9/1930 | BIRM |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 9/1930 10/1930 | BIRM |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Job Edward Lousley | 9/1930 10/1930 | SLBI |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Job Edward Lousley | 8/9/1930 24/9/1930 | SLBI |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club | 9/1930 10/1930 | SLBI |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 8/9/1930 to 24/9/1930 | BIRM |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 9/1930 to 10/1930 | BIRM |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Saint Ippolyts | Joseph Edward Little | Watson Botanical Exchange Club Job Edward Lousley | 18/5/1931 | SLBI |
| Viola tricolor subsp. tricolor | GB, VC13 West Sussex, Borden Wood | Joseph Edward Little | Watson Botanical Exchange Club | 2/5/1924 | SLBI |
| Viola tricolor subsp. tricolor | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 15/5/1931 | BIRM |
| Viola tricolor subsp. tricolor | GB, VC20 Hertfordshire, Saint Ippolyts | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 18/5/1931 | BIRM |