| Anthyllis vulneraria | GB, VC3 South Devon, Bigbury Bay | Thomas Richard Archer Briggs | Frederick Townsend | 5/7/1875 | SLBI |
| Carduus pycnocephalus | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Frederick Townsend | 1/7/1878 | SLBI |
| Hypericum undulatum | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Allan Octavian Hume Frederick Townsend | 10/9/1870 | SLBI |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC3 South Devon, Harraton | Thomas Richard Archer Briggs | Allan Octavian Hume Frederick Townsend | 30/7/1878 | SLBI |
| Persicaria lapathifolia | GB, VC3 South Devon, Ivybridge | Thomas Richard Archer Briggs | Frederick Townsend | 15/9/1877 | SLBI |
| Polygonum aviculare | GB, VC3 South Devon, Wembury | Thomas Richard Archer Briggs | Frederick Townsend | 2/9/1867 | SLBI |
| Rosa agrestis | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | Frederick Townsend | | SLBI |
| Rosa canina x obtusifolia = R. x dumetorum | GB, VC2 East Cornwall, Saint Mellion | Thomas Richard Archer Briggs | Frederick Townsend | 21/6/1870 | SLBI |
| Rosa obtusifolia subsp. tomentella | GB, VC3 South Devon, Lee Mill Bridge | Thomas Richard Archer Briggs | Frederick Townsend | 13/7/1870 | SLBI |
| Rosa stylosa var. leucochroa | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | Frederick Townsend | 25/6/1878 | SLBI |
| Rumex rupestris | GB, VC3 South Devon, Kingston | Thomas Richard Archer Briggs | Allan Octavian Hume Frederick Townsend | 10/7/1876 | SLBI |
| Sorbus devoniensis | GB, VC3 South Devon, Roborough | Thomas Richard Archer Briggs | Allan Octavian Hume Frederick Townsend | 25/5/1871 | SLBI |
| Carduus crispus x nutans = C. x stangii | GB, VC3 South Devon, Leighham | Thomas Richard Archer Briggs | Harold Stuart Thompson | 27/6/1890 | BIRM |
| Reseda alba | GB, VC1 West Cornwall, Saint Marys | Thomas Richard Archer Briggs William Booth Waterfall | Harold Stuart Thompson | 5/1877 | BIRM |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, Essex GB, VC6 North Somerset, Clifton Cultivated | James Walter White | Albert Bruce Jackson Charles Edgar Salmon David Fry Thomas Richard Archer Briggs | 14/8/1908 | K |
| Crassula tillaea | GB, VC3 South Devon, Plym Valley | Thomas Richard Archer Briggs | John Ralfs | 23/4/1872 | SLBI |
| Orobanche minor var. maritima | GB, VC2 East Cornwall, Whitsand Bay | Thomas Richard Archer Briggs | John Ralfs | 7/1875 | SLBI |
| Schoenoplectus triqueter | GB, VC2,VC3, River Tamar | Thomas Richard Archer Briggs | John Ralfs | 1876 | SLBI |
| Bromus hordeaceus subsp. thominei | GB, VC3 South Devon, Bigbury Bay | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles William Hunt Painter | 25/5/1885 | ABS |
| Lobelia urens | GB, VC2 East Cornwall, Lostwithiel and St.Veep, between | Thomas Richard Archer Briggs | William Hunt Painter | 10/10/1883 | ABS |
| Pyrus cordata | GB, VC3 South Devon, Egg Buckland | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles William Hunt Painter | 18/5/1881 | ABS |
| Rosa stylosa | GB, VC9 Dorset, Bere Wood | Thomas Richard Archer Briggs William Moyle Rogers | Botanical Exchange Club of The British Isles William Hunt Painter William Moyle Rogers | 19/7/1887 | ABS |
| Rubus | | Thomas Richard Archer Briggs | William Hunt Painter | 8/7/1868 | ABS |
| Rubus hastiformis | GB, VC3 South Devon, Rumple Quarries | Thomas Richard Archer Briggs | William Hunt Painter William Moyle Rogers | 6/8/1867 | ABS |
| Rubus macrophyllus var. schlechtendalii | GB, VC3 South Devon, Harford GB, VC3 South Devon, Ivybridge | Thomas Richard Archer Briggs | William Hunt Painter William Moyle Rogers | 8/1890 | ABS |
| Rubus pruinosus | GB, VC11 South Hampshire, Sway | Thomas Richard Archer Briggs William Moyle Rogers | William Hunt Painter | 7/8/1889 | ABS |
| Viola hirta | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | George Nicholson William Hadden Beeby William Williamson Newbould | 14/4/1882 | SLBI |
| Crepis nicaeensis | GB, VC2 East Cornwall, Penters Cross | Thomas Richard Archer Briggs | William Hadden Beeby | 11/6/1878 | SLBI |
| Atriplex laciniata | GB, VC1 West Cornwall, Marazion Green | Thomas Richard Archer Briggs | Augustin Ley Elizabeth Anne Lomax | 8/1875 | BIRM |
+ | Clinopodium ascendens | GB, VC3 South Devon, Ivybridge | Thomas Richard Archer Briggs | Elizabeth Anne Lomax | 15/9/1877 | MANCH |
| Rumex crispus x obtusifolius = R. x pratensis | GB, VC3 South Devon, Hemerdon | Thomas Richard Archer Briggs | Elizabeth Anne Lomax | 15/7/1876 | MANCH |
+ | Zostera noltei | GB, VC3 South Devon, Erme Mouth | Thomas Richard Archer Briggs | Elizabeth Anne Lomax | 10/7/1874 | MANCH |
| Carex paniculata x remota = C. x boenninghauseniana | GB, VC3 South Devon, Caton | Thomas Richard Archer Briggs | Botanical Exchange Club of The British Isles Edward Francis Linton Thomas Richard Archer Briggs | 10/7/1879 | BM |
| Ambrosia artemisiifolia | GB, VC2 East Cornwall, Calstock | Thomas Richard Archer Briggs | Augustin Ley | 12/9/1876 | BIRM |
| Asplenium obovatum | GB, VC3 South Devon, Petertavy | Thomas Richard Archer Briggs | Augustin Ley | 4/8/1866 | BIRM |
| Atriplex patula | GB, VC3 South Devon, Honicknowle | Thomas Richard Archer Briggs | Augustin Ley | 17/7/1875 | BIRM |
| Avena strigosa | GB, VC3 South Devon, Tamerton Foliott | Thomas Richard Archer Briggs | Augustin Ley | 6/7/1871 | BIRM |
| Barbarea intermedia | GB, VC3 South Devon, Knackers Knowle | Thomas Richard Archer Briggs | Augustin Ley | 15/5/1878 | BIRM |
| Brassica rapa var. briggsii | GB, VC2 East Cornwall, Torpoint | Thomas Richard Archer Briggs | Augustin Ley | 15/6/1872 | BIRM |
| Bromus hordeaceus subsp. thominei | GB, VC2 East Cornwall, Rame Head | Thomas Richard Archer Briggs | Augustin Ley | 14/6/1877 | BIRM |