| Orobanche minor var. maritima | GB, VC2 East Cornwall, Seaton | Thomas Richard Archer Briggs | Augustin Ley | 12/6/1876 | BIRM |
| Verbascum thapsus x nigrum = V. x semialbum | GB, VC2 East Cornwall, Seaton | Thomas Richard Archer Briggs | Augustin Ley | 12/6/1876 24/7/1876 | BIRM |
| Ranunculus sardous | GB, VC2 East Cornwall, Sheviock | Thomas Richard Archer Briggs | Augustin Ley | 5/6/1871 | BIRM |
| Rosa obtusifolia subsp. tomentella | GB, VC2 East Cornwall, Sheviock | Thomas Richard Archer Briggs | | 12/7/1875 | SLBI |
| Brassica rapa var. briggsii | GB, VC2 East Cornwall, Torpoint | Thomas Richard Archer Briggs | Augustin Ley | 15/6/1872 | BIRM |
| Carex muricata | GB, VC2 East Cornwall, Torpoint | Thomas Richard Archer Briggs | | 15/6/1872 | BM |
| Carex vulpina | GB, VC2 East Cornwall, Torpoint | Thomas Richard Archer Briggs | | 2/7/1869 | BM |
| Erophila verna | GB, VC2 East Cornwall, Torpoint | Thomas Richard Archer Briggs | William Hadden Beeby | 1/4/1874 | SLBI |
| Prunus spinosa x domestica = P. x fruticans | GB, VC2 East Cornwall, Torpoint | Thomas Richard Archer Briggs | Augustin Ley | 17/4/1876 | BIRM |
| Prunus spinosa x domestica = P. x fruticans | GB, VC2 East Cornwall, Torpoint | Thomas Richard Archer Briggs | Augustin Ley | 19/9/1876 | BIRM |
| 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 |
| Mentha arvensis | GB, VC2 East Cornwall, Tregantle | Thomas Richard Archer Briggs | | 25/8/1876 | K |
| Senecio vulgaris | GB, VC2 East Cornwall, Tregantle | Thomas Richard Archer Briggs | Augustin Ley | 17/4/1875 | BIRM |
| Callitriche hamulata | GB, VC2 East Cornwall, Trematon | Thomas Richard Archer Briggs | Augustin Ley | | BIRM |
| Drosera intermedia | GB, VC2 East Cornwall, Viverdon Down | Thomas Richard Archer Briggs | London Botanical Exchange Club Robert Large Baker | 8/8/1865 | BIRM |
| Rumex rupestris | GB, VC2 East Cornwall, Whitsand | Thomas Richard Archer Briggs | London Natural History Society | 27/7/1877 | SLBI |
| Galium verum x mollugo = G. x pomeranicum | GB, VC2 East Cornwall, Whitsand Bay | Thomas Richard Archer Briggs | Charles Bailey John Harbord Lewis | 14/7/1869 | MANCH |
| Orobanche minor var. maritima | GB, VC2 East Cornwall, Whitsand Bay | Thomas Richard Archer Briggs | Augustin Ley | 24/6/1875 | BIRM |
| Orobanche minor var. maritima | GB, VC2 East Cornwall, Whitsand Bay | Thomas Richard Archer Briggs | John Ralfs | 7/1875 | 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 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 | GB, Cornwall | Thomas Richard Archer Briggs | London Botanical Exchange Club Robert Large Baker | | BIRM |
+ | Illecebrum verticillatum | GB, Cornwall, Cornwall | Thomas Richard Archer Briggs | Charles Bailey Isaiah Waterloo Nicholson Keys John Barrow | 7/1866 | MANCH |
+ | Schoenoplectus triqueter | GB, Cornwall, Cornwall | Thomas Richard Archer Briggs | Charles Bailey | 7/9/1875 | MANCH |
| Stellaria holostea | GB, VC3 South Devon | Thomas Richard Archer Briggs | Augustin Ley | 30/5/1877 | BIRM |
+ | Viola lactea | GB, VC3 South Devon | Thomas Richard Archer Briggs | Botanical Exchange Club Charles Bailey | 30/5/1877 | 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 |
| Eleocharis parvula | GB, VC3 South Devon, Aveton Gifford | Thomas Richard Archer Briggs | William Hillhouse | 8/1880 | BIRM |
| Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Aveton Gifford | Thomas Richard Archer Briggs | Charles Cardale Babington | 5/8/1880 | CGE |
| Mespilus germanica | GB, VC3 South Devon, Battisborough | Thomas Richard Archer Briggs | Augustin Ley Thomas Richard Archer Briggs | 26/5/1868 20/8/1868 | BIRM |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC3 South Devon, Bere Alston | Thomas Richard Archer Briggs | | 26/8/1890 | K |