| Callitriche hamulata | GB, VC2 East Cornwall, Trematon | Thomas Richard Archer Briggs | Augustin Ley | | BIRM |
| Carex paniculata x remota = C. x boenninghauseniana | GB, VC13 West Sussex, Henfield GB, VC3 South Devon, Caton GB, VC32 Northamptonshire | George Chester Thomas Hilton Thomas Richard Archer Briggs | | | MANCH |
| Rosa agrestis | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Frederick Townsend | | SLBI |
| Rosa canina x obtusifolia = R. x dumetorum | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | William Hadden Beeby Andrew Bloxam | | SLBI |
| Rosa micrantha var. briggsii | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | William Hadden Beeby | | SLBI |
| Rubus briggsii | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Andrew Bloxam | | SLBI |
| Rubus longithyrsiger | GB, Devon | Thomas Richard Archer Briggs | | | SLBI |
| Rubus sagittarius | GB, Devon | Thomas Richard Archer Briggs | | | SLBI |
| Rumex | GB, Cornwall | Thomas Richard Archer Briggs | London Botanical Exchange Club Robert Large Baker | | BIRM |
+ | Teucrium scordium | GB, VC4 North Devon, Braunton Burrows | Thomas Richard Archer Briggs | Charles Bailey Alexander Irvine | 1862 | MANCH |
| Ranunculus sardous | GB, VC2 East Cornwall, Saint John's | Thomas Richard Archer Briggs | Charles Bailey John Harbord Lewis | 6/1862 | MANCH |
+ | Viola lactea | GB, VC3 South Devon | Thomas Richard Archer Briggs | Charles Bailey | 12/5/1864 | MANCH |
| Drosera intermedia | GB, VC2 East Cornwall, Viverdon Down | Thomas Richard Archer Briggs | London Botanical Exchange Club Robert Large Baker | 8/8/1865 | BIRM |
| Rubus ulmifolius | GB, VC4 North Devon, Roborough | Thomas Richard Archer Briggs | | 17/8/1865 | SLBI |
| Rubus ulmifolius | GB, VC3 South Devon, Plympton Maurice | Thomas Richard Archer Briggs | Andrew Bloxam | 7/9/1865 | SLBI |
+ | Eryngium campestre | GB, VC6 North Somerset, Congresbury | Thomas Richard Archer Briggs | | 1866 | MANCH |
| Rosa micrantha var. briggsii | GB, VC3 South Devon, Plym Valley | Thomas Richard Archer Briggs | | 1866 | SLBI |
+ | Illecebrum verticillatum | GB, Cornwall, Cornwall | Thomas Richard Archer Briggs | Charles Bailey Isaiah Waterloo Nicholson Keys John Barrow | 7/1866 | MANCH |
+ | Cicendia filiformis | GB, VC1 West Cornwall, Porthcurnow | Thomas Richard Archer Briggs | Charles Bailey | 26/7/1866 | MANCH |
| Illecebrum verticillatum | GB, VC1 West Cornwall, Land's End | Thomas Richard Archer Briggs | Augustin Ley | 26/7/1866 | BIRM |
| Asplenium obovatum | GB, VC3 South Devon, Petertavy | Thomas Richard Archer Briggs | Augustin Ley | 4/8/1866 | BIRM |
| Rubus adscitus | GB, VC3 South Devon, Plympton | Thomas Richard Archer Briggs | William Hadden Beeby Andrew Bloxam | 25/8/1866 | SLBI |
| Rubus lindleianus | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Thomas Richard Archer Briggs | 4/9/1866 | SLBI |
| Rubus opacus | | Thomas Richard Archer Briggs | William Hadden Beeby | 1867 | SLBI |
+ | Viola lactea | GB, VC3 South Devon | Thomas Richard Archer Briggs | Charles Bailey | 25/5/1867 | MANCH |
| Rubus opacus | GB, VC3 South Devon, Tory Brook | Thomas Richard Archer Briggs | Andrew Bloxam | 9/7/1867 | SLBI |
| Rubus adscitus | GB, VC3 South Devon, Crabtree | Thomas Richard Archer Briggs | | 25/7/1867 | SLBI |
| Hypericum undulatum | GB, VC3 South Devon, Plymbridge | Thomas Richard Archer Briggs | Augustin Ley | 6/8/1867 | BIRM |
| Rubus hastiformis | GB, VC3 South Devon, Rumple Quarries | Thomas Richard Archer Briggs | William Hunt Painter William Moyle Rogers | 6/8/1867 | ABS |
| Rubus opacus | GB, VC3 South Devon, Combe Point | Thomas Richard Archer Briggs | | 6/8/1867 | SLBI |
+ | Mentha arvensis x aquatica = M. x verticillata | | Thomas Richard Archer Briggs | Charles Bailey | 17/8/1867 | MANCH |
+ | Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Plym Valley | Thomas Richard Archer Briggs | Charles Bailey | 23/8/1867 | MANCH |
| Polygonum aviculare | GB, VC3 South Devon, Wembury | Thomas Richard Archer Briggs | Frederick Townsend | 2/9/1867 | SLBI |
+ | Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Common Wood | Thomas Richard Archer Briggs | Charles Bailey | 4/9/1867 | MANCH |
| Carex arenaria | GB, VC3 South Devon, Mothecombe | Thomas Richard Archer Briggs | | 26/5/1868 | BM |
| Mespilus germanica | GB, VC3 South Devon, Battisborough | Thomas Richard Archer Briggs | Augustin Ley Thomas Richard Archer Briggs | 26/5/1868 20/8/1868 | BIRM |
| Carex strigosa | GB, VC58 Cheshire, Cotterill Clough | George Edward Hunt | Botanical Exchange Club of The British Isles Thomas Richard Archer Briggs | 6/1868 | E |
| Carex divulsa subsp. divulsa | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | Thomas Richard Archer Briggs | 2/6/1868 | BM |
| Crepis biennis | GB, VC3 South Devon, Shaugh Bridge | Thomas Richard Archer Briggs | Augustin Ley Thomas Richard Archer Briggs | 9/6/1868 | BIRM |
| Carex rostrata | GB, VC3 South Devon, Dartmoor | Thomas Richard Archer Briggs | Frederick Janson Hanbury John Thomas Irvine Boswell-Syme | 30/6/1868 | BM |