| Gagea lutea | GB, VC6 North Somerset, Bath | Noel Yvri Sandwith | Harold Stuart Thompson | 3/1919 | BIRM |
| Polygala calcarea | GB, VC6 North Somerset, Fortnight | Noel Yvri Sandwith | Harold Stuart Thompson | 3/6/1920 | BIRM |
| Juncus subnodulosus | GB, VC6 North Somerset, Nailsea | Harold Stuart Thompson Noel Yvri Sandwith | Harold Stuart Thompson | 10/9/1921 | BIRM |
| Arnoseris minima | GB, VC17 Surrey, Tilford | Cecil Ivry Sandwith Noel Yvri Sandwith | Harold Stuart Thompson | 16/8/1916 | BIRM |
| Arnoseris minima | GB, VC17 Surrey, Tilford | Cecil Ivry Sandwith Noel Yvri Sandwith | Harold Stuart Thompson | 19/8/1916 | BIRM |
| Pulsatilla vulgaris | GB, VC33 East Gloucestershire, Snowshill | Cecil Ivry Sandwith Noel Yvri Sandwith | Harold Stuart Thompson | 23/4/1919 | BIRM |
| Thlaspi perfoliatum | GB, VC33 East Gloucestershire, Snowshill | Cecil Ivry Sandwith Noel Yvri Sandwith | Harold Stuart Thompson | 23/4/1919 | BIRM |
| Lepidium perfoliatum | GB, VC34 West Gloucestershire, Ashton Gate | Cecil Ivry Sandwith Noel Yvri Sandwith | Harold Stuart Thompson | 5/6/1918 | BIRM |
| Lolium multiflorum | GB, VC34 West Gloucestershire, Eastville, Bristol | N Sandwith Noel Yvri Sandwith | Harold Stuart Thompson | 26/7/1917 | BIRM |
| Sagina boydii subsp. apetala | GB, VC34 West Gloucestershire, Siston | Noel Yvri Sandwith | C I & N Y Sandwith Harold Stuart Thompson | 12/8/1920 | BIRM |
| Potamogeton gramineus | GB, VC56 Nottinghamshire, Everton Carr | Cecil Ivry Sandwith Noel Yvri Sandwith | Harold Stuart Thompson Arthur Bennett | 30/8/1918 | BIRM |
| Carex hirta | GB, VC6 North Somerset, Berrow | Cecil Ivry Sandwith Noel Yvri Sandwith | Royal Botanic Gardens, Kew | 8/7/1951 | BM |
| Carex ovalis | GB, VC17 Surrey, Peasmarsh | Noel Yvri Sandwith Norman Douglas Simpson | Norman Douglas Simpson | 22/7/1941 | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC19 North Essex, Heybridge | Noel Yvri Sandwith | | 26/6/1955 | BM |
| Carex appropinquata | GB, VC21 Middlesex, Springwell Moor | Albert Bruce Jackson Noel Yvri Sandwith | Noel Yvri Sandwith | 9/5/1936 | BM |
| Carex divulsa subsp. divulsa | GB, VC35 Monmouthshire, Kingcoed | Noel Yvri Sandwith | Royal Botanic Gardens, Kew | 27/6/1946 | BM |
| Festuca arundinacea | GB, VC1 West Cornwall, Kynance Cove | Noel Yvri Sandwith | | 8/6/1949 | K |
| Plantago coronopus | GB, VC1 West Cornwall, Lizard | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/6/1937 | K |
| Galeopsis tetrahit | GB, VC2 East Cornwall, Ruan High Lanes | Cecil Ivry Sandwith Noel Yvri Sandwith | | 14/8/1934 | K |
| Mentha spicata | GB, VC2 East Cornwall, Veryan | Cecil Ivry Sandwith Noel Yvri Sandwith | | 14/8/1934 | K |
| Stachys palustris | GB, VC6 North Somerset, Catcott | Cecil Ivry Sandwith Noel Yvri Sandwith | | 21/7/1958 | K |
| Oenanthe fistulosa | GB, VC6 North Somerset, Catcott | Noel Yvri Sandwith | | 2/7/1963 | K |
| Oenanthe fistulosa | GB, VC6 North Somerset, Catcott | Noel Yvri Sandwith | | 29/7/1963 | K |
| Mentha piperita var. piperita | GB, VC6 North Somerset, Charterhouse on Mendip | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/8/1959 | K |
| Mentha piperita var. piperita | GB, VC6 North Somerset, Charterhouse on Mendip | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/8/1959 | K |
| Ligustrum vulgare | GB, VC6 North Somerset, Cleeve Toot | Cecil Ivry Sandwith Noel Yvri Sandwith | | 29/12/1945 | K |
| Festuca arundinacea | GB, VC6 North Somerset, Clifton Bridge | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/5/1955 | K |
| Callitriche stagnalis | GB, VC6 North Somerset, Clutton | Noel Yvri Sandwith | | 7/6/1959 | K |
| Mentha spicata x suaveolens = M. x villosa | GB, VC6 North Somerset, Compton Dando | Noel Yvri Sandwith | J Fraser | 11/9/1933 | K |
| Mentha spicata | GB, VC6 North Somerset, Compton Dando | Noel Yvri Sandwith | | 11/9/1933 | K |
| Mentha arvensis | GB, VC6 North Somerset, Cranmore | Cecil Ivry Sandwith Noel Yvri Sandwith | | 30/7/1941 | K |
| Mentha arvensis var. densifoliata | GB, VC6 North Somerset, Glastonbury | Noel Yvri Sandwith | | 13/9/1933 | K |
| Veronica catenata | GB, VC6 North Somerset, Gurney Slade | Cecil Ivry Sandwith Noel Yvri Sandwith | | 6/8/1959 | K |
| Callitriche truncata | GB, VC6 North Somerset, Kingston Seymour | Cecil Ivry Sandwith Noel Yvri Sandwith | | 24/9/1951 27/9/1951 | K |
| Ajuga reptans | GB, VC6 North Somerset, Leigh Woods | Cecil Ivry Sandwith Noel Yvri Sandwith | | 15/5/1927 | K |
| Veronica scutellata | GB, VC6 North Somerset, Nailsea | Cecil Ivry Sandwith Noel Yvri Sandwith | | 1/7/1947 | K |
| Veronica catenata | GB, VC6 North Somerset, Portbury | Cecil Ivry Sandwith Noel Yvri Sandwith | | 19/6/1929 | K |
| Mentha x piperita var. vulgaris | GB, VC6 North Somerset, Priddy | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/9/1923 | K |
| Mentha gentilis var. gracilis | GB, VC6 North Somerset, Sharpham Moor | Cecil Ivry Sandwith Noel Yvri Sandwith | | 13/9/1933 | K |
| Clinopodium ascendens | GB, VC6 North Somerset, Tickenham | Noel Yvri Sandwith | | 17/9/1932 | K |