| Callitriche autumnalis | IE, VCH39 Co. Antrim, Lough Neagh | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 13/8/1909 | BIRM |
| Callitriche hamulata | GB, VC9 Dorset, Wyke Regis | Edward Charles Wallace | Watson Botanical Exchange Club Edward Charles Wallace | 14/6/1928 | SLBI |
| Callitriche hamulata | GB, VC17 Surrey, Mitcham Common | Job Edward Lousley | Watson Botanical Exchange Club Harold Stuart Thompson | 10/5/1931 | BIRM |
| Callitriche hamulata | GB, VC40 Shropshire, Church Stretton | Augustin Ley | Watson Botanical Exchange Club Harold Stuart Thompson | 18/7/1909 | BIRM |
| Callitriche hamulata | GB, VC49 Caernarvonshire, Llyn Idwal | George Goode | Watson Botanical Exchange Club Augustin Ley George Goode | 9/8/1910 | BIRM |
| Callitriche hamulata | GB, VC108 West Sutherland, Inch-na-damff | Edward Shearburn Marshall | Watson Botanical Exchange Club William Robert Sherrin | 18/7/1908 | SLBI |
| Callitriche hamulata | GB, VC108 West Sutherland, Inchnadamph | Edward Shearburn Marshall | Watson Botanical Exchange Club Augustin Ley | 18/7/1908 | BIRM |
| Callitriche hamulata | GB, VC108 West Sutherland, Inchnadamph | Edward Shearburn Marshall | Watson Botanical Exchange Club Douglas Montague Heath | 18/7/1908 | BIRM |
| Callitriche hamulata | IE, VCH38 Co. Down, Castlewellan Forest Park | Samuel Alexander Stewart | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | 7/6/1897 | BIRM |
| Callitriche hamulata | IE, VCH38 Co. Down, Sheepbridge | Henry William Lett | Watson Botanical Exchange Club Harold Stuart Thompson Henry William Lett | 6/6/1901 | BIRM |
| Callitriche hermaphroditica | VCH39, Harbour Island | Coslett Herbert Waddell | Watson Botanical Exchange Club William Robert Sherrin | 18/8/1909 | SLBI |
| Callitriche hermaphroditica | GB, VC16 West Kent, Darenth | St John Marriott | Watson Botanical Exchange Club Isaac A Helsby | 7/1924 | SLBI |
| Callitriche hermaphroditica | GB, VC82 East Lothian, Dunbar | McTaggert Cowan | London Natural History Society Watson Botanical Exchange Club Edmund Browne Bishop McTaggert Cowan | 7/1911 | SLBI |
| Callitriche intermedia | GB, VC108 West Sutherland, Inchnadamph | Edward Shearburn Marshall | Watson Botanical Exchange Club | 18/7/1908 | K |
| Callitriche intermedia | GB, VC108 West Sutherland, Inchnadamph | Edward Shearburn Marshall | Watson Botanical Exchange Club Albert Bruce Jackson | 18/7/1908 | K |
| Callitriche intermedia subsp. hamulata | GB, VC17 Surrey, Mitcham | | Watson Botanical Exchange Club Albert Bruce Jackson Henry Tuke Mennell | | K |
| Callitriche obtusangula | GB, VC6 North Somerset, Sharpham Moor | Harold Stuart Thompson | Watson Botanical Exchange Club Harold Stuart Thompson Job Edward Lousley | 26/6/1931 | SLBI |
| Callitriche obtusangula | GB, VC6 North Somerset, Sharpham Moor | Harold Stuart Thompson | Watson Botanical Exchange Club | 26/6/1931 | SLBI |
| Callitriche obtusangula | GB, VC6 North Somerset, Sharpham Moor | Harold Stuart Thompson | Watson Botanical Exchange Club Harold Stuart Thompson Job Edward Lousley | 14/6/1930 | SLBI |
| Callitriche obtusangula | GB, VC6 North Somerset, Sharpham Moor | Harold Stuart Thompson | Watson Botanical Exchange Club | 14/6/1930 | SLBI |
| Callitriche obtusangula | GB, VC9 Dorset, Wyke Regis | Edward Charles Wallace | Watson Botanical Exchange Club | 14/6/1928 | SLBI |
| Callitriche obtusangula | GB, VC17 Surrey, Epsom Downs | Job Edward Lousley | Watson Botanical Exchange Club | 29/5/1926 | SLBI |
| Callitriche platycarpa | GB, VC20 Hertfordshire, Bull's Green | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 9/6/1925 | BIRM |
| Callitriche stagnalis | GB, VC20 Hertfordshire, Bull's Green | Joseph Edward Little | Watson Botanical Exchange Club | 9/6/1925 | SLBI |
| Callitriche stagnalis | GB, VC34 West Gloucestershire, Wickwar | Ida Mary Roper | Watson Botanical Exchange Club Harold Stuart Thompson Ida Mary Roper | 30/6/1925 | BIRM |
| Callitriche stagnalis | GB, VC113 Channel Islands, Guernsey,Grande Mare | William Charles Barton | Watson Botanical Exchange Club Harold Stuart Thompson William Charles Barton | 16/8/1912 | BIRM |
| Callitriche truncata | GB, VC5 South Somerset, Cannington | Edward Shearburn Marshall | Watson Botanical Exchange Club | 19/10/1915 | K |
| Callitriche truncata | GB, VC5 South Somerset, Charlton | Edward Shearburn Marshall | Watson Botanical Exchange Club Harold Stuart Thompson | 17/7/1917 | BIRM |
| Callitriche truncata | GB, VC16 West Kent, Chipstead | Edward Charles Wallace | Watson Botanical Exchange Club | 26/8/1933 | SLBI |
| Callitriche truncata | GB, VC16 West Kent, Chipstead | Edward Charles Wallace | Watson Botanical Exchange Club Edward Charles Wallace | 26/8/1933 | K |
| Callitriche truncata | GB, VC16 West Kent, Chipstead | Edward Charles Wallace | Watson Botanical Exchange Club Edward Charles Wallace Harold Stuart Thompson | 26/5/1933 | BIRM |
| Callitriche truncata | GB, VC16,VC18, River Darent | J Fraser | Watson Botanical Exchange Club Edward Charles Wallace J Fraser | | K |
| Callitriche truncata | GB, VC113 Channel Islands, Guernsey | David Thomson Playfair | Watson Botanical Exchange Club Albert Bruce Jackson David Thomson Playfair | 25/5/1897 | K |
| Callitriche truncata | GB, VC113 Channel Islands, Guernsey | Margaret Dawber | Watson Botanical Exchange Club Harold Stuart Thompson | 10/7/1888 | BIRM |
| Caltha palustris var. guerangerii | GB, VC6 North Somerset, Compton Dando | Ida Mary Roper | Watson Botanical Exchange Club Ida Mary Roper | 21/5/1921 | SLBI |
| Caltha palustris var. guerangerii | GB, VC6 North Somerset, Compton Dando | Ida Mary Roper | Watson Botanical Exchange Club Harold Stuart Thompson Ida Mary Roper | 21/3/1921 | BIRM |
| Caltha palustris var. guerangerii | GB, VC11 South Hampshire, Beaulieu | Ida Mary Roper | Watson Botanical Exchange Club Ida Mary Roper | 29/5/1933 | SLBI |
| Caltha palustris var. guerangerii | GB, VC37 Worcestershire, Harborne, Pills wood | Harold Stuart Thompson | Watson Botanical Exchange Club Charles Edgar Salmon Harold Stuart Thompson | 19/5/1901 | ABS |
| Caltha palustris var. guerangerii | GB, VC88 Mid Perthshire, Ben Lawers | Peter Ewing | Watson Botanical Exchange Club Peter Ewing | 7/1911 | MANCH |
| Caltha palustris var. radicans | GB, VC88 Mid Perthshire, Ben Lawers | Peter Ewing | Watson Botanical Exchange Club Augustin Ley Peter Ewing | 7/1907 | BIRM |