| Callitriche stagnalis | FI, Helsinki | Alfred Oswald Kihlman | | 18/8/1884 | ABS |
| Callitriche platycarpa | GB, VC1 West Cornwall, Castle an Dinas | D A J Little | | 19/11/1942 | ABS |
| Callitriche palustris | GB, VC1 West Cornwall, Gwennap | Frederick Hamilton Davey | Allan Octavian Hume | 29/3/1900 | SLBI |
| Callitriche palustris | GB, VC1 West Cornwall, Gwennap | Frederick Hamilton Davey | Allan Octavian Hume | 29/3/1900 | SLBI |
| Callitriche hamulata | GB, VC1 West Cornwall, Kynance Cove | Job Edward Lousley | Job Edward Lousley | 30/5/1929 | SLBI |
| Callitriche stagnalis | GB, VC1 West Cornwall, Little Petherick | Laurence Athelstan Molesworth Riley | Laurence Athelstan Molesworth Riley | 9/9/1906 | K |
| Callitriche obtusangula | GB, VC1 West Cornwall, Padstow | Laurence Athelstan Molesworth Riley | Laurence Athelstan Molesworth Riley | 17/9/1906 | K |
| Callitriche stagnalis | GB, VC1 West Cornwall, Penhallow | Francis Rilstone | Botanical Exchange Club of The British Isles | 20/5/1936 | K |
| Callitriche stagnalis | GB, VC1 West Cornwall, Penryn | Allan Octavian Hume | Allan Octavian Hume | 6/9/1899 | SLBI |
| Callitriche stagnalis | GB, VC1 West Cornwall, Penryn | Allan Octavian Hume | Allan Octavian Hume | 6/9/1899 | SLBI |
| Callitriche hamulata | GB, VC1 West Cornwall, Penzance | Henry Franklin Parsons | Croydon Natural History and Scientific Society | 1/6/1869 | SLBI |
| Callitriche stagnalis | GB, VC1 West Cornwall, Perranporth | Edgar Thurston | Edgar Thurston | 25/8/1916 | K |
| Callitriche obtusangula | GB, VC1 West Cornwall, Porthcothan | Laurence Athelstan Molesworth Riley | Laurence Athelstan Molesworth Riley | 11/9/1906 | K |
| Callitriche brutia | GB, VC1 West Cornwall, Porthmeor | Laurence Athelstan Molesworth Riley | Laurence Athelstan Molesworth Riley | 15/9/1906 | K |
| Callitriche stagnalis | GB, VC1 West Cornwall, Porthmeor | Laurence Athelstan Molesworth Riley | Laurence Athelstan Molesworth Riley | 15/9/1906 | K |
| Callitriche stagnalis | GB, VC1 West Cornwall, Quintrell Downs | | Clement Reid | 24/6/1903 | K |
| Callitriche brutia | GB, VC1 West Cornwall, Saint Allen | Edgar Thurston | Edgar Thurston | 10/8/1916 | K |
| Callitriche brutia | GB, VC1 West Cornwall, Saint Enoder | Clement Reid | Allan Octavian Hume | 16/6/1903 | SLBI |
| Callitriche brutia | GB, VC1 West Cornwall, Saint Enoder | Clement Reid | Allan Octavian Hume | 16/6/1903 | SLBI |
| Callitriche intermedia subsp. hamulata | GB, VC1 West Cornwall, Saint Martin's | Job Edward Lousley | | 28/5/1940 | K |
| Callitriche intermedia | GB, VC1 West Cornwall, Saint Mary's, Scilly Isles | Richard Vercoe Tellam | George Stephen West | | BIRM |
| Callitriche intermedia subsp. hamulata | GB, VC1 West Cornwall, Saint Mary's, Scilly Isles | Job Edward Lousley | Job Edward Lousley | 3/7/1954 | K |
| Callitriche stagnalis | GB, VC1 West Cornwall, Samson | Job Edward Lousley | | 1/6/1940 | K |
| Callitriche stagnalis | GB, VC1 West Cornwall, Samson | Job Edward Lousley | Job Edward Lousley | 1/6/1940 | K |
| Callitriche intermedia subsp. hamulata | GB, VC1 West Cornwall, Scilly Isles,Saint Marys | Job Edward Lousley | Job Edward Lousley | 3/7/1954 | K |
| Callitriche obtusangula | GB, VC1 West Cornwall, Scilly Isles,Saint Marys | Frederick Janson Hanbury Thomas Richard Archer Briggs | William Booth Waterfall | 1/7/1877 | K |
| Callitriche stagnalis | GB, VC1 West Cornwall, Sennen | William Bertram Turrill | | 19/7/1932 | K |
| Callitriche brutia | GB, VC1 West Cornwall, Trengwainton | William Curnow | | | K |
| Callitriche intermedia subsp. hamulata | GB, VC2 East Cornwall, Dozmary Pool | Edgar Thurston | Edgar Thurston | 19/7/1915 | K |
| Callitriche stagnalis | GB, VC2 East Cornwall, Fowey | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 16/6/1949 | K |
| Callitriche intermedia subsp. hamulata | GB, VC2 East Cornwall, Fowey River, near Dozmary Pool | Edgar Thurston | Edgar Thurston | 19/7/1915 | K |
| Callitriche intermedia | GB, VC2 East Cornwall, Fraddon | | Clement Reid | 23/6/1903 | K |
| Callitriche intermedia subsp. hamulata | GB, VC2 East Cornwall, Par Harbour | Edgar Thurston | Edgar Thurston | 30/7/1925 | K |
| Callitriche stagnalis | GB, VC2 East Cornwall, Saint Goran | | Clement Reid | 18/6/1904 | K |
| Callitriche hamulata | GB, VC2 East Cornwall, Trematon | Thomas Richard Archer Briggs | Augustin Ley | | BIRM |
| Callitriche stagnalis | GB, VC2 East Cornwall, Week Saint Mary | William Wise | William Wise | 6/1918 | LAUS |
| Callitriche brutia | GB, Cornwall, Trefullack Moor | Clement Reid | Clement Reid | 5/1903 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Ashprington | M E Edmonds | | 19/5/1935 | K |
| Callitriche intermedia | GB, VC3 South Devon, Lympstone | Robert Coane Roberts Jordan | Robert Coane Roberts Jordan | 31/7/1846 | BIRM |
| Callitriche intermedia subsp. hamulata | GB, VC3 South Devon, Marsh Mills | | William Booth Waterfall M Bowen | 2/7/1877 | K |