| Illecebrum verticillatum | GB, VC1 West Cornwall, Land's End | Thomas Richard Archer Briggs | Augustin Ley | 26/7/1866 | BIRM |
| Atriplex laciniata | GB, VC1 West Cornwall, Marazion Green | Thomas Richard Archer Briggs | Augustin Ley Elizabeth Anne Lomax | 8/1875 | BIRM |
+ | Cicendia filiformis | GB, VC1 West Cornwall, Porthcurnow | Thomas Richard Archer Briggs | Charles Bailey | 26/7/1866 | MANCH |
| Reseda alba | GB, VC1 West Cornwall, Saint Marys | Thomas Richard Archer Briggs William Booth Waterfall | Harold Stuart Thompson | 5/1877 | BIRM |
| Callitriche obtusangula | GB, VC1 West Cornwall, Scilly Isles,Saint Marys | Frederick Janson Hanbury Thomas Richard Archer Briggs | William Booth Waterfall | 1/7/1877 | K |
| Mentha arvensis | GB, VC2 East Cornwall, Anthony | Thomas Richard Archer Briggs | | 25/8/1876 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC2 East Cornwall, Antony | Thomas Richard Archer Briggs | Augustin Ley | 17/8/1872 | BIRM |
| Rosa stylosa var. systyla | GB, VC2 East Cornwall, Antony | Thomas Richard Archer Briggs | William Hadden Beeby | 24/6/1875 | SLBI |
| Rubus leyanus | GB, VC2 East Cornwall, Antony | Thomas Richard Archer Briggs | | 2/9/1878 | SHYB |
+ | Lobelia urens | GB, VC2 East Cornwall, Bodmin (Se of),Lostwithiel | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles Charles Bailey | 10/10/1883 | 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 |
| Ambrosia artemisiifolia | GB, VC2 East Cornwall, Calstock | Thomas Richard Archer Briggs | Augustin Ley | 12/9/1876 | BIRM |
| Schoenoplectus lacustris x triqueter = S. x carinatus | GB, VC2 East Cornwall, Calstock | Thomas Richard Archer Briggs | Augustin Ley | 7/9/1875 | BIRM |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC2 East Cornwall, Carkeel | Thomas Richard Archer Briggs | Charles Cardale Babington | 19/9/1873 | CGE |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC2 East Cornwall, Carkees | Thomas Richard Archer Briggs | Augustin Ley | 19/8/1873 | BIRM |
| Elymus pungens | GB, VC2 East Cornwall, Cremyll | Thomas Richard Archer Briggs | | 13/8/1877 | ABS |
| Brassica rapa var. briggsii | GB, VC2 East Cornwall, Empacombe | Thomas Richard Archer Briggs | | 29/7/1875 | SLBI |
| Mentha arvensis x spicata = M. x gracilis | GB, VC2 East Cornwall, Hatt | Thomas Richard Archer Briggs | | 4/9/1877 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC2 East Cornwall, Hatt, Botus Fleming | Thomas Richard Archer Briggs | | 12/9/1876 | CGE |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC2 East Cornwall, Hatt, Botusfleming | Thomas Richard Archer Briggs | Augustin Ley | 12/9/1876 | BIRM |
| Mentha arvensis x spicata = M. x gracilis | GB, VC2 East Cornwall, Hatt, Botusfleming | Thomas Richard Archer Briggs | | 12/9/1876 | CGE |
| 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 |
| Rubus longithyrsiger | GB, VC2 East Cornwall, Landrake | Thomas Richard Archer Briggs | | 13/7/1872 | SHYB |
| Rosa arvensis | GB, VC2 East Cornwall, Latchbrook | Thomas Richard Archer Briggs | | 16/9/1875 | SLBI |
| Avena strigosa | GB, VC2 East Cornwall, Looe | Thomas Richard Archer Briggs | | 10/7/1871 | BON |
| Lotus angustissimus | GB, VC2 East Cornwall, Looe | Thomas Richard Archer Briggs | Augustin Ley | 10/7/1871 | BIRM |
| Lobelia urens | GB, VC2 East Cornwall, Lostwithiel and St.Veep, between | Thomas Richard Archer Briggs | William Hunt Painter | 10/10/1883 | ABS |
| Crepis nicaeensis | GB, VC2 East Cornwall, Penters Cross | Thomas Richard Archer Briggs | William Hadden Beeby | 11/6/1878 | SLBI |
| Bromus hordeaceus subsp. thominei | GB, VC2 East Cornwall, Rame Head | Thomas Richard Archer Briggs | Augustin Ley | 14/6/1877 | BIRM |
| Spergularia rubra | GB, VC2 East Cornwall, Saint German's | Thomas Richard Archer Briggs | Augustin Ley | 2/8/1875 | BIRM |
+ | Pyrus cordata | GB, VC2 East Cornwall, Saint John | Thomas Richard Archer Briggs | | 1877 | BIRM |
| Ranunculus sardous | GB, VC2 East Cornwall, Saint John's | Thomas Richard Archer Briggs | Charles Bailey John Harbord Lewis | 6/1862 | MANCH |
| Taraxacum sect. Palustria | GB, VC2 East Cornwall, Saint John's | Thomas Richard Archer Briggs | Augustin Ley | 5/5/1873 | BIRM |
| Zostera nana | GB, VC2 East Cornwall, Saint John's | Thomas Richard Archer Briggs | Augustin Ley | 1877 | BIRM |
| Lobelia urens | GB, VC2 East Cornwall, Saint Lostwithiel | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles William Hadden Beeby | 10/10/1883 | SLBI |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC2 East Cornwall, Saint Mellion | Thomas Richard Archer Briggs | | 4/9/1877 | CGE |
| Rosa canina x obtusifolia = R. x dumetorum | GB, VC2 East Cornwall, Saint Mellion | Thomas Richard Archer Briggs | Frederick Townsend | 21/6/1870 | SLBI |
| Mespilus germanica | GB, VC2 East Cornwall, Saltash | Thomas Richard Archer Briggs | William Hadden Beeby | 5/1871 | SLBI |
| Mespilus germanica | GB, VC2 East Cornwall, Saltash | Thomas Richard Archer Briggs | Augustin Ley | 27/5/1871 | BIRM |