| Rubus amplificatus | GB, VC3 South Devon, Plymbridge | Thomas Richard Archer Briggs | | 21/7/1868 | SLBI |
| Rubus pruinosus | GB, VC3 South Devon, Plymbridge | Thomas Richard Archer Briggs | | 18/7/1868 | SLBI |
| Carduus pycnocephalus | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles | 2/6/1882 | SLBI |
| Carduus pycnocephalus | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles Augustin Ley | 22/6/1882 | BIRM |
| Carduus pycnocephalus | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Frederick Townsend | 1/7/1878 | SLBI |
| Epilobium lanceolatum | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | | 14/4/1877 | BIRM |
| Hypericum undulatum | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | William Hadden Beeby | 8/1870 | SLBI |
| Hypericum undulatum | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Allan Octavian Hume Frederick Townsend | 10/9/1870 | SLBI |
+ | Mentha aquatica x spicata = M. x piperita | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | | 15/9/1876 | BIRM |
| Odontites vernus | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Augustin Ley | 19/6/1872 | BIRM |
| Polycarpon tetraphyllum | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | William Hadden Beeby | 5/1869 | SLBI |
| Polygonum rurivagum | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Augustin Ley | 25/8/1868 | BIRM |
| Polygonum rurivagum | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Augustin Ley | 25/8/1868 | BIRM |
| 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 lindleianus | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Thomas Richard Archer Briggs | 4/9/1866 | SLBI |
+ | Rumex conglomeratus x pulcher = R. x muretii | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Charles Bailey | 4/8/1879 | MANCH |
| Rumex conglomeratus x pulcher = R. x muretii | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles Augustin Ley | 4/8/1879 | BIRM |
| Valerianella rimosa | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | William Hadden Beeby | 19/7/1872 | SLBI |
| Viola hirta | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | George Nicholson William Hadden Beeby William Williamson Newbould | 14/4/1882 | SLBI |
+ | Viola lactea | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Botanical Exchange Club Charles Bailey | 16/6/1879 | MANCH |
| Viola odorata x hirta = V. x scabra | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Charles Bailey | 16/6/1876 | MANCH |
| Callitriche obtusangula | GB, VC3 South Devon, Plympton | Thomas Richard Archer Briggs | | 9/1877 | ABS |
| Lolium temulentum | GB, VC3 South Devon, Plympton | Thomas Richard Archer Briggs | Augustin Ley | 3/8/1878 | BIRM |
| Rubus adscitus | GB, VC3 South Devon, Plympton | Thomas Richard Archer Briggs | William Hadden Beeby Andrew Bloxam | 25/8/1866 | SLBI |
| Taraxacum sect. Palustria | GB, VC3 South Devon, Plympton | Thomas Richard Archer Briggs | Augustin Ley | 24/5/1873 | BIRM |
| Viola odorata x hirta = V. x scabra | GB, VC3 South Devon, Plympton | Thomas Richard Archer Briggs | William Hadden Beeby | 26/4/1875 | SLBI |
| Viola odorata x hirta = V. x scabra | GB, VC3 South Devon, Plympton | Thomas Richard Archer Briggs | Augustin Ley | 26/4/1875 | BIRM |
| Rubus ulmifolius | GB, VC3 South Devon, Plympton Maurice | Thomas Richard Archer Briggs | Andrew Bloxam | 7/9/1865 | SLBI |
| Callitriche obtusangula | GB, VC3 South Devon, Plympton Saint Mary | Thomas Richard Archer Briggs | | 19/9/1888 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC3 South Devon, Plymstock | Thomas Richard Archer Briggs | | 27/9/1876 | LIV |
| Callitriche hamulata | GB, VC3 South Devon, River Plym | Thomas Richard Archer Briggs | Augustin Ley | 15/6/1880 | BIRM |
| Schoenoplectus triqueter | GB, VC3 South Devon, River Tamar at Gawton | Thomas Richard Archer Briggs | | 13/9/1875 | BIRM |
| Schoenoplectus triqueter | GB, VC3 South Devon, River Tamar at Gawton | Thomas Richard Archer Briggs | | 13/9/1875 | SLBI |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC3 South Devon, River Tavy | Thomas Richard Archer Briggs | Augustin Ley | 30/8/1875 | BIRM |
| Rubus incurvatus | GB, VC3 South Devon, Roborough | Thomas Richard Archer Briggs | | 7/1868 | SLBI |
| Sorbus devoniensis | GB, VC3 South Devon, Roborough | Thomas Richard Archer Briggs | | 25/5/1871 | SLBI |
| Sorbus devoniensis | GB, VC3 South Devon, Roborough | Thomas Richard Archer Briggs | Augustin Ley | 20/8/1870 | BIRM |