| Linaria vulgaris | GB, VC34 West Gloucestershire, Avonmouth Docks, Bristol | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/1935 | K |
| Linaria vulgaris | GB, VC34 West Gloucestershire, Avonmouth Docks, Bristol | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/1935 | K |
| Linaria repens | GB, VC34 West Gloucestershire, Avonmouth | Cecil Ivry Sandwith Noel Yvri Sandwith | | 21/8/1949 | K |
| Linaria repens | GB, VC34 West Gloucestershire, Chittening Warth | Cecil Ivry Sandwith Noel Yvri Sandwith | | 12/8/1956 | K |
| Limosella australis | GB, VC41 Glamorganshire, Kenfig | Cecil Ivry Sandwith Eleanor Vachell | Eleanor Vachell | 10/1933 | K |
| Ligustrum vulgare | GB, VC6 North Somerset, Cleeve Toot | Cecil Ivry Sandwith Noel Yvri Sandwith | | 29/12/1945 | K |
| Lepidium perfoliatum | GB, VC34 West Gloucestershire, Ashton Gate | Cecil Ivry Sandwith Noel Yvri Sandwith | Harold Stuart Thompson | 5/6/1918 | BIRM |
| Lepidium graminifolium | GB, VC34 West Gloucestershire, Avonmouth Docks, Bristol | Cecil Ivry Sandwith James Walter White | Watson Botanical Exchange Club Harold Stuart Thompson James Walter White | 27/10/1925 | BIRM |
| Leonurus cardiaca | GB, Hampshire, Selborne | Cecil Ivry Sandwith | Charles Baylis Green | 26/8/1915 | SLBI |
| Lamium confertum | GB, VC94 Banffshire, Cullen | Cecil Ivry Sandwith Noel Yvri Sandwith | | 22/7/1938 | K |
| Kickxia spuria | GB, VC11 South Hampshire, Hayling Island | Cecil Ivry Sandwith Noel Yvri Sandwith | | 11/9/1927 | K |
| Juncus tenuis | GB, VC6 North Somerset, River Avon | Cecil Ivry Sandwith Harold Stuart Thompson | Harold Stuart Thompson | 12/5/1915 1/9/1917 2/1/1918 | BIRM |
| Hypochaeris glabra | GB, VC56 Nottinghamshire, Everton | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/8/1939 | K |
| Herminium monorchis | GB, VC33 East Gloucestershire, Painswick | Cecil Ivry Sandwith | Harold Stuart Thompson | | BIRM |
| Groenlandia densa | GB, VC54 North Lincolnshire, Haxey | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/1939 | K |
| Gnaphalium uliginosum | GB, VC6 North Somerset, Blagdon | Cecil Ivry Sandwith Harold Stuart Thompson | Harold Stuart Thompson | 13/10/1933 | BIRM |
| Galeopsis versicolor | GB, VC56 Nottinghamshire, Everton Carr | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/8/1939 | K |
| Galeopsis tetrahit | GB, VC2 East Cornwall, Ruan High Lanes | Cecil Ivry Sandwith Noel Yvri Sandwith | | 14/8/1934 | K |
| Galeopsis segetum | GB, VC56 Nottinghamshire, Everton Carr | Cecil Ivry Sandwith Noel Yvri Sandwith | | 30/8/1918 | K |
| Galeopsis angustifolia | GB, VC12 North Hampshire, East Tisted | Cecil Ivry Sandwith Noel Yvri Sandwith | | 22/8/1915 | K |
| Festuca arundinacea | GB, VC6 North Somerset, Clifton Bridge | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/5/1955 | K |
| Festuca arundinacea | GB, VC11 South Hampshire, Redbridge | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/7/1928 | K |
| Euonymus europaeus | GB, VC6 North Somerset, Clay Bottom | Cecil Ivry Sandwith Harold Stuart Thompson | Job Edward Lousley | 7/11/1933 | SLBI |
| Erucastrum gallicum | GB, VC34 West Gloucestershire, Bristol | Cecil Ivry Sandwith Ivor W Evans | Harold Stuart Thompson | 13/9/1936 | BIRM |
| Eriophorum vaginatum | GB, VC6 North Somerset, Westhay Moor | Cecil Ivry Sandwith Harold Stuart Thompson | Harold Stuart Thompson | 10/7/1935 | BIRM |
| Epipactis purpurata | GB, VC11 South Hampshire, Petersfield | Cecil Ivry Sandwith | Harold Stuart Thompson | 25/8/1915 | BIRM |
| Cuscuta epithymum | GB, VC6 North Somerset, Tickenham | Cecil Ivry Sandwith Noel Yvri Sandwith | | 24/9/1944 | K |
| Clinopodium ascendens | GB, VC6 North Somerset, Tickenham | Cecil Ivry Sandwith Noel Yvri Sandwith | | 11/8/1956 | K |
| Carex hirta | GB, VC6 North Somerset, Berrow | Cecil Ivry Sandwith Noel Yvri Sandwith | Royal Botanic Gardens, Kew | 8/7/1951 | BM |
| Carex ericetorum | GB, VC26 West Suffolk, Eriswell | Cecil Ivry Sandwith Edgar Wolston Bertram Handsley Milne-Redhead Herbert Kenneth Airy Shaw Noel Yvri Sandwith | | 6/5/1933 | K |
| Carex diandra | GB, VC6 North Somerset, Ashcott | Cecil Ivry Sandwith | Charles Baylis Green | 1/6/1914 | SLBI |
| Carex acuta | GB, VC34 West Gloucestershire, Pucklechurch | Cecil Ivry Sandwith | Charles Baylis Green | 13/6/1913 | SLBI |
| Campanula patula | GB, VC37 Worcestershire, Elmley Lovett | Cecil Ivry Sandwith Noel Yvri Sandwith | | 3/8/1936 | K |
| Callitriche truncata | GB, VC6 North Somerset, Kingston Seymour | Cecil Ivry Sandwith Noel Yvri Sandwith | | 24/9/1951 27/9/1951 | K |
| Callitriche truncata | GB, VC56 Nottinghamshire, Clumber Park | Cecil Ivry Sandwith Noel Yvri Sandwith | | 10/9/1918 | K |
| Callitriche truncata | GB, VC56 Nottinghamshire, Clumber Park | Cecil Ivry Sandwith Noel Yvri Sandwith | | 10/9/1918 | K |
| Callitriche truncata | GB, VC56 Nottinghamshire, Misterton | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/1918 | K |
| Callitriche truncata | GB, VC56 Nottinghamshire, Misterton | Cecil Ivry Sandwith Noel Yvri Sandwith | | 2/9/1918 | K |
| Callitriche truncata | GB, VC56 Nottinghamshire, Misterton | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/8/1939 | K |
| Callitriche obtusangula | GB, VC6 North Somerset, Weston in Gordano | Cecil Ivry Sandwith Noel Yvri Sandwith | | 3/6/1956 | K |
| Callitriche autumnalis | GB, VC89 East Perthshire, Stormont Loch | Cecil Ivry Sandwith Noel Yvri Sandwith | | 31/7/1936 | K |
| Astragalus danicus | GB, VC33 East Gloucestershire, Hatherop | Cecil Ivry Sandwith Noel Yvri Sandwith | | 6/1918 | K |
| 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 |
| Ajuga reptans | GB, VC6 North Somerset, Leigh Woods | Cecil Ivry Sandwith Noel Yvri Sandwith | | 15/5/1927 | K |
| Ajuga reptans | GB, VC6 North Somerset, Tickenham GB, VC6 North Somerset, Wraxall | Cecil Ivry Sandwith | | 26/5/1930 | K |