| Rosa micrantha var. pedunculo-nudo | GB, VC3 South Devon, Bickleigh | Thomas Richard Archer Briggs | | 6/7/1870 | SLBI |
| Carex montana | GB, VC3 South Devon, Bickleigh | Thomas Richard Archer Briggs | | 4/1873 | LAUS |
| Rubus bloxamii | GB, VC3 South Devon, Bickleigh | Thomas Richard Archer Briggs | William Moyle Rogers | 18/8/1884 | ABS |
| Rubus hastiformis | GB, VC3 South Devon, Bickleigh Vale | Thomas Richard Archer Briggs | | 18/8/1886 | BSBI |
| Verbascum | GB, VC3 South Devon, Bovey Tracey | Thomas Richard Archer Briggs | | 22/6/1881 | K |
| 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, Caton | Thomas Richard Archer Briggs | | 18/7/1879 | BM |
| Rubus dentatifolius | GB, VC3 South Devon, Cholwichtown | Thomas Richard Archer Briggs | | 6/8/1881 | SLBI |
| Rubus opacus | GB, VC3 South Devon, Combe Point | Thomas Richard Archer Briggs | | 6/8/1867 | SLBI |
| Rubus adscitus | GB, VC3 South Devon, Crabtree | Thomas Richard Archer Briggs | | 25/7/1867 | SLBI |
| Rubus ulmifolius | GB, VC3 South Devon, Crabtree | Thomas Richard Archer Briggs | | 4/8/1868 | SLBI |
| Puccinellia fasciculata | GB, VC3 South Devon, Crabtree | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles Robert Large Baker | 26/6/1875 | BIRM |
| Rubus ramosus | GB, VC3 South Devon, Crabtree | Thomas Richard Archer Briggs | | 1/8/1887 | BSBI |
| Rubus silvaticus | GB, VC3 South Devon, Derriford | Thomas Richard Archer Briggs | William Moyle Rogers | 7/1890 | SHYB |
| Eryngium campestre | GB, VC3 South Devon, Devil's Point | Thomas Richard Archer Briggs | George Stephen West | 5/10/1876 | BIRM |
| Carex divulsa subsp. divulsa | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | Thomas Richard Archer Briggs | 2/6/1868 | BM |
| Pyrus cordata | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | | 13/8/1875 | SLBI |
| Pyrus cordata | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | William Hadden Beeby | 13/8/1875 | SLBI |
| Viola lactea | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | William Hadden Beeby | 26/5/1876 | SLBI |
+ | Pyrus cordata | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | Charles Bailey | 13/8/1876 | MANCH |
| Rubus sagittarius | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | | 8/8/1878 | SLBI |
+ | Pyrus cordata | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | Charles Bailey | 18/5/1881 | MANCH |
| Pyrus cordata | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles William Hadden Beeby | 13/9/1881 | SLBI |
| Sorbus devoniensis | GB, VC3 South Devon, Egg Buckland Cultivated | Thomas Richard Archer Briggs | William Hadden Beeby | 10/1884 | SLBI |
| Rubus ramosus | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | | 8/8/1887 | BSBI |
| Rubus mutabilis | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | | 23/8/1887 | BSBI |
| Scrophularia nodosa | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | | 27/6/1890 | K |
+ | Epilobium hirsutum x montanum = E. x erroneum | GB, VC3 South Devon, Eggbuckland | Thomas Richard Archer Briggs | | 2/8/1881 | BIRM |
| Carex hirta | GB, VC3 South Devon, Elburton | Thomas Richard Archer Briggs | | 4/7/1874 | BM |
| Zostera nana | GB, VC3 South Devon, Erme Mouth | Thomas Richard Archer Briggs | | 10/7/1876 | BIRM |
| Potamogeton polygonifolius | GB, VC3 South Devon, Erme Valley | Thomas Richard Archer Briggs | | 6/1876 | E |
| Mentha spicata | GB, VC3 South Devon, Ermington | Thomas Richard Archer Briggs | | 29/8/1876 | K |
| Carex paniculata x remota = C. x boenninghauseniana | GB, VC3 South Devon, Ermington | Thomas Richard Archer Briggs | Thomas Richard Archer Briggs | 25/5/1883 | BM |
| Pyrus cordata | GB, VC3 South Devon, Estover | Thomas Richard Archer Briggs | | 9/5/1870 | BIRM |
| Pyrus cordata | GB, VC3 South Devon, Estover | Thomas Richard Archer Briggs | | 4/5/1871 | BIRM |
| Pyrus cordata | GB, VC3 South Devon, Estover | Thomas Richard Archer Briggs | | 21/8/1876 | BIRM |
| Pyrus cordata | GB, VC3 South Devon, Estover | Thomas Richard Archer Briggs | | 11/5/1877 | BIRM |
+ | Pyrus cordata | GB, VC3 South Devon, Estover | Thomas Richard Archer Briggs | | 13/9/1881 | BIRM |
| Rubus saxatilis | GB, VC3 South Devon, Fancy | Thomas Richard Archer Briggs | | 9/7/1888 | LAUS |
| Polycarpon tetraphyllum | GB, VC3 South Devon, King's Tamerton, Plymouth | Thomas Richard Archer Briggs | George Stephen West | 5/1869 | BIRM |