+ | Pyrus cordata | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | Charles Bailey | 18/5/1881 to 13/9/1881 | MANCH |
+ | Pyrus cordata | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | Charles Bailey | 30/5/1879 | MANCH |
| Ranunculus sardous | GB, VC2 East Cornwall, Saint John's | Thomas Richard Archer Briggs | Charles Bailey John Harbord Lewis | 6/1862 | MANCH |
| Rumex conglomeratus x pulcher = R. x muretii | GB, VC2 East Cornwall, Torpoint Cultivated | John Thomas Irvine Boswell-Syme Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles Charles Bailey | 9/1879 | MANCH |
+ | Rumex conglomeratus x pulcher = R. x muretii | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Charles Bailey | 4/8/1879 | MANCH |
+ | Rumex rupestris | GB, VC2 East Cornwall, Whitsand Bay | Thomas Richard Archer Briggs | Charles Bailey | 13/8/1877 | MANCH |
+ | Rumex rupestris | GB, VC2 East Cornwall, Whitsand Bay | Thomas Richard Archer Briggs | Charles Bailey | 31/7/1876 | MANCH |
+ | Rumex rupestris | GB, VC2 East Cornwall, Whitsand Bay | Thomas Richard Archer Briggs | Charles Bailey | 27/7/1877 | MANCH |
+ | Rumex rupestris | GB, VC3 South Devon, Bigbury Bay | Thomas Richard Archer Briggs | Charles Bailey | 10/7/1876 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC3 South Devon, Crabtree | Thomas Richard Archer Briggs | Charles Bailey | 1869 | MANCH |
+ | Viola lactea | GB, VC3 South Devon | Thomas Richard Archer Briggs | Charles Bailey | 12/5/1864 | MANCH |
+ | Viola lactea | GB, VC3 South Devon | Thomas Richard Archer Briggs | Charles Bailey | 25/5/1867 | MANCH |
+ | Viola lactea | GB, VC3 South Devon | Thomas Richard Archer Briggs | Charles Bailey | 15/5/1876 | MANCH |
| Viola odorata x hirta = V. x scabra | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Charles Bailey | 16/6/1876 | MANCH |
| Viola odorata x hirta = V. x scabra | GB, VC3 South Devon, Elburton | Thomas Richard Archer Briggs | Charles Bailey | 14/3/1876 | MANCH |
| Erophila verna | GB, VC2 East Cornwall, Torpoint | Thomas Richard Archer Briggs | William Hadden Beeby | 1/4/1874 | SLBI |
+ | Illecebrum verticillatum | GB, Cornwall, Cornwall | Thomas Richard Archer Briggs | Charles Bailey Isaiah Waterloo Nicholson Keys John Barrow | 7/1866 | MANCH |
| Carex paniculata x remota = C. x boenninghauseniana | GB, VC3 South Devon, Caton | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles John Thomas Irvine Boswell-Syme Thomas Richard Archer Briggs | 7/1879 | BM |
| Carex rostrata | GB, VC3 South Devon, Dartmoor | Thomas Richard Archer Briggs | Frederick Janson Hanbury John Thomas Irvine Boswell-Syme | 30/6/1868 | BM |
| Rumex rupestris x pulcher = R. x trimenii | GB, Devon, Plymouth GB, VC85 Fifeshire, Balmuto Cultivated | John Thomas Irvine Boswell-Syme Thomas Richard Archer Briggs | | 8/1881 | MANCH |
| Alopecurus bulbosus | GB, VC2 East Cornwall, Calstock | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles Robert Large Baker | 31/5/1875 | BIRM |
| Avena strigosa | GB, VC2 East Cornwall, Looe | Thomas Richard Archer Briggs | | 10/7/1871 | BON |
| Ballota ruderalis | GB, VC33 East Gloucestershire, Gloucester Docks | Gustavus A Ornano St Brody | Thomas Richard Archer Briggs | 1869 | K |
| Brassica rapa var. briggsii | GB, VC2 East Cornwall, Empacombe | Thomas Richard Archer Briggs | | 29/7/1875 | SLBI |
| 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 |
| Carduus pycnocephalus | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles | 2/6/1882 | SLBI |
| Carex arenaria | GB, VC3 South Devon, Mothecombe | Thomas Richard Archer Briggs | | 26/5/1868 | BM |
| Carex divulsa subsp. divulsa | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | Thomas Richard Archer Briggs | 2/6/1868 | BM |
| Carex hirta | GB, VC3 South Devon, Elburton | Thomas Richard Archer Briggs | | 4/7/1874 | BM |
| Carex montana | GB, VC3 South Devon, Bickleigh | Thomas Richard Archer Briggs | | 4/1873 | LAUS |
| Carex ovalis | GB, VC3 South Devon, Tamerton Foliot | Thomas Richard Archer Briggs | | 14/6/1871 | BM |
| 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 |
| Carex paniculata x remota = C. x boenninghauseniana | GB, VC3 South Devon, Caton | Thomas Richard Archer Briggs | | 18/7/1879 | BM |
| Carex paniculata x remota = C. x boenninghauseniana | GB, VC3 South Devon, Caton | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles Arthur Bennett | 7/1879 | BM |
| Carex paniculata x remota = C. x boenninghauseniana | GB, VC3 South Devon, Ermington | Thomas Richard Archer Briggs | Thomas Richard Archer Briggs | 25/5/1883 | BM |
| Carex pseudocyperus | GB, VC3 South Devon, Plymbridge | Thomas Richard Archer Briggs | | 13/8/1875 | BM |
| 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 vulpina | GB, VC2 East Cornwall, Torpoint | Thomas Richard Archer Briggs | | 2/7/1869 | BM |
| Drosera rotundifolia | GB, VC71 Isle of Man, Snaefell | Thomas Richard Archer Briggs | Robert Large Baker | 8/1877 | BIRM |