| 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 |
| Schoenoplectus triqueter | GB, VC2,VC3, River Tamar | Thomas Richard Archer Briggs | John Ralfs | 1876 | SLBI |
+ | Schoenoplectus triqueter | GB, VC6 North Somerset, Congresbury | Thomas Richard Archer Briggs | Charles Bailey | 13/9/1875 | MANCH |
| Schoenoplectus lacustris x triqueter = S. x carinatus | GB, VC2 East Cornwall, Calstock | Thomas Richard Archer Briggs | Augustin Ley | 7/9/1875 | BIRM |
| Salix cinerea x aurita = S. x multinervis | GB, VC3 South Devon, Crabtree | Thomas Richard Archer Briggs | Charles Bailey | 1869 | MANCH |
| Salix cinerea subsp. oleifolia | GB, VC2 East Cornwall, Kingsand | Thomas Richard Archer Briggs | Allan Octavian Hume | 5/5/1876 | SLBI |
| Salix cinerea subsp. oleifolia | GB, VC2 East Cornwall, Kingsand | Thomas Richard Archer Briggs | Augustin Ley | 5/5/1876 19/9/1876 | BIRM |
+ | Rumex rupestris x pulcher = R. x trimenii | GB, VC2 East Cornwall, Whitsand Bay | Thomas Richard Archer Briggs | | 27/7/1877 | MANCH |
| Rumex rupestris x pulcher = R. x trimenii | GB, VC2 East Cornwall, Whitsand Bay | Thomas Richard Archer Briggs | Augustin Ley | 31/7/1876 | BIRM |
| 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 |
| Rumex rupestris | GB, VC2 East Cornwall, Whitsand | Thomas Richard Archer Briggs | London Natural History Society | 27/7/1877 | SLBI |
+ | 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, 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 | | 9/8/1875 | SLBI |
+ | Rumex rupestris | GB, VC2 East Cornwall, Whitsand Bay | Thomas Richard Archer Briggs | | 31/7/1876 | MANCH |
| Rumex rupestris | GB, VC2 East Cornwall, Whitsand Bay | Thomas Richard Archer Briggs | Robert Large Baker | 27/7/1877 | BIRM |
+ | Rumex rupestris | GB, VC3 South Devon, Bigbury Bay | Thomas Richard Archer Briggs | Charles Bailey | 10/7/1876 | MANCH |
| Rumex rupestris | GB, VC3 South Devon, Bigbury Bay | Thomas Richard Archer Briggs | Augustin Ley | 10/7/1876 | BIRM |
| Rumex rupestris | GB, VC3 South Devon, Kingston | Thomas Richard Archer Briggs | Allan Octavian Hume Frederick Townsend | 10/7/1876 | SLBI |
| Rumex rupestris | GB, VC3 South Devon, Wembury | Thomas Richard Archer Briggs | Robert Large Baker | 10/8/1874 | BIRM |
| Rumex rupestris | GB, VC3 South Devon, Wembury | Thomas Richard Archer Briggs | | 26/7/1875 | SLBI |
| Rumex rupestris | GB, VC3 South Devon, Wembury | Thomas Richard Archer Briggs | Augustin Ley | 26/7/1875 | BIRM |
| Rumex crispus x obtusifolius = R. x pratensis | GB, VC3 South Devon, Hemerdon | Thomas Richard Archer Briggs | Elizabeth Anne Lomax | 15/7/1876 | 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 Charles Bailey | 9/1879 | 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 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 |
| Rumex conglomeratus x pulcher = R. x muretii | GB, VC85 Fifeshire, Balmuto Cultivated | John Thomas Irvine Syme Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles Augustin Ley | 9/1879 | BIRM |
| Rumex | GB, Cornwall | Thomas Richard Archer Briggs | London Botanical Exchange Club Robert Large Baker | | BIRM |
| Rubus ulmifolius | GB, VC3 South Devon, Crabtree | Thomas Richard Archer Briggs | | 4/8/1868 | SLBI |
| Rubus ulmifolius | GB, VC3 South Devon, Plympton Maurice | Thomas Richard Archer Briggs | Andrew Bloxam | 7/9/1865 | SLBI |
| Rubus ulmifolius | GB, VC4 North Devon, Roborough | Thomas Richard Archer Briggs | | 17/8/1865 | SLBI |
| Rubus silvaticus | GB, VC3 South Devon, Derriford | Thomas Richard Archer Briggs | William Moyle Rogers | 7/1890 | SHYB |
| Rubus saxatilis | GB, VC3 South Devon, Fancy | Thomas Richard Archer Briggs | | 9/7/1888 | LAUS |
| Rubus sagittarius | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | | 8/8/1878 | SLBI |
| Rubus sagittarius | GB, VC3 South Devon, Plym Valley | Thomas Richard Archer Briggs | | 3/9/1870 | SLBI |
| Rubus sagittarius | GB, VC3 South Devon, Tamerton Foliot | Thomas Richard Archer Briggs | | 27/8/1870 | SLBI |
| Rubus sagittarius | GB, Devon | Thomas Richard Archer Briggs | | | SLBI |