| Callitriche intermedia subsp. hamulata | GB, VC3 South Devon, Moretonhampstead | Clement Reid | | 10/8/1909 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Moretonhampstead | | Clement Reid | 10/8/1909 | K |
| Callitriche intermedia subsp. hamulata | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 13/8/1957 | K |
| Callitriche intermedia subsp. hamulata | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 13/8/1957 | K |
| Callitriche intermedia subsp. hamulata | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 22/8/1957 | K |
| Callitriche obtusangula | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 2/8/1957 | K |
| Callitriche obtusangula | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 2/8/1957 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 13/8/1957 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 13/8/1957 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 13/8/1957 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 22/8/1957 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 22/8/1957 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 22/8/1957 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Newton Poppleford | E Robinson | | 22/8/1957 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Penn Moor | M E Edmonds | | 8/1932 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Plymouth | | William Booth Waterfall | 1877 | K |
| Callitriche stagnalis | GB, VC3 South Devon, Plymouth | William Booth Waterfall | William Booth Waterfall | 1877 | K |
| Callitriche obtusangula | GB, VC3 South Devon, Plympton | Thomas Richard Archer Briggs | | 9/1877 | ABS |
| Callitriche obtusangula | GB, VC3 South Devon, Plympton Saint Mary | Thomas Richard Archer Briggs | | 19/9/1888 | K |
| Callitriche truncata | GB, VC3 South Devon, River Axe | John Keyloch | | 31/8/1875 | K |
| Callitriche hamulata | GB, VC3 South Devon, River Plym | Thomas Richard Archer Briggs | Augustin Ley | 15/6/1880 | BIRM |
| Callitriche hamulata | GB, VC3 South Devon, Walkhampton | Allan Octavian Hume | | 28/8/1902 | SLBI |
| Callitriche hamulata | GB, VC3 South Devon, Walkhampton | Allan Octavian Hume | | 28/8/1902 | SLBI |
| Callitriche obtusangula | GB, VC4 North Devon, Appledore | John Patrick Micklethwait Brenan | | 21/5/1936 | K |
| Callitriche stagnalis | GB, VC4 North Devon, Belstone | William Robert Sherrin | | 7/1924 | SLBI |
| Callitriche intermedia subsp. hamulata | GB, VC4 North Devon, Pennymoor | M E Edmonds | | 1/8/1932 | K |
| Callitriche stagnalis | GB, VC5 South Somerset, Ashington Wood | Frederick Kirkwood Makins | | 14/6/1937 | K |
| Callitriche palustris | GB, VC5 South Somerset, Bridgwater | Harold Stuart Thompson | Harold Stuart Thompson | 1885 | 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, VC5 South Somerset, Creech Saint Michael | Edward Shearburn Marshall | Botanical Exchange Club of The British Isles Charles Edward Britton | 17/7/1917 | K |
| Callitriche obtusangula | GB, VC5 South Somerset, Curry Moor | John Keyloch | | 15/7/1974 | K |
| Callitriche stagnalis | GB, VC5 South Somerset, Quantock Farm | Harold Stuart Thompson | Harold Stuart Thompson | 7/1888 | BIRM |
| Callitriche stagnalis | GB, VC5 South Somerset, Quantock Hills | Harold Stuart Thompson | Harold Stuart Thompson | 1890 | BIRM |
| Callitriche hamulata | GB, VC5 South Somerset, Simonsbath | Harold Stuart Thompson | Harold Stuart Thompson | 7/1927 | BIRM |
| Callitriche truncata | GB, VC5 South Somerset, Taunton | John Patrick Micklethwait Brenan | | 8/9/1936 | K |
| Callitriche platycarpa | GB, VC6 North Somerset, Berrow | James Walter White | James Walter White William Hunt Painter | 6/1895 | ABS |
| Callitriche hamulata | GB, VC6 North Somerset, Black Down | Harold Stuart Thompson | Harold Stuart Thompson | 17/6/1930 | BIRM |
| Callitriche obtusangula | GB, VC6 North Somerset, Bruton | Frederick Kirkwood Makins | | 28/8/1937 | K |
| Callitriche truncata | GB, VC6 North Somerset, Charlton | Edward Shearburn Marshall | Harold Stuart Thompson | 17/7/1917 | BIRM |