| 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 |
| Veronica catenata | GB, VC6 North Somerset, Gurney Slade | Cecil Ivry Sandwith Noel Yvri Sandwith | | 6/8/1959 | K |
| Stachys palustris | GB, VC6 North Somerset, Catcott | Cecil Ivry Sandwith Noel Yvri Sandwith | | 21/7/1958 | K |
| Linaria repens | GB, VC34 West Gloucestershire, Chittening Warth | Cecil Ivry Sandwith Noel Yvri Sandwith | | 12/8/1956 | K |
| Linaria vulgaris x repens = L. x sepium | GB, VC34 West Gloucestershire, Avonmouth | Cecil Ivry Sandwith Noel Yvri Sandwith | | 12/8/1956 | K |
| Clinopodium ascendens | GB, VC6 North Somerset, Tickenham | Cecil Ivry Sandwith Noel Yvri Sandwith | | 11/8/1956 | K |
| Callitriche obtusangula | GB, VC6 North Somerset, Weston in Gordano | Cecil Ivry Sandwith Noel Yvri Sandwith | | 3/6/1956 | K |
| Mentha piperita var. piperita | GB, VC8 South Wiltshire, Semley | Cecil Ivry Sandwith Noel Yvri Sandwith | | 14/9/1955 | K |
| Festuca arundinacea | GB, VC6 North Somerset, Clifton Bridge | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/5/1955 | K |
| Callitriche truncata | GB, VC6 North Somerset, Kingston Seymour | Cecil Ivry Sandwith Noel Yvri Sandwith | | 24/9/1951 27/9/1951 | K |
| Carex hirta | GB, VC6 North Somerset, Berrow | Cecil Ivry Sandwith Noel Yvri Sandwith | Royal Botanic Gardens, Kew | 8/7/1951 | BM |
| Plantago lanceolata var. anthoviridis | GB, VC6 North Somerset, Tickenham | Cecil Ivry Sandwith Noel Yvri Sandwith | | 15/5/1951 | K |
| Linaria repens | GB, VC34 West Gloucestershire, Avonmouth | Cecil Ivry Sandwith Noel Yvri Sandwith | | 21/8/1949 | K |
| Verbascum chaixii subsp. chaixii | GB, VC34 West Gloucestershire, Mangotsfield | Cecil Ivry Sandwith Noel Yvri Sandwith | | 10/7/1949 | K |
| Verbascum chaixii subsp. chaixii | GB, VC34 West Gloucestershire, Mangotsfield | Cecil Ivry Sandwith Noel Yvri Sandwith | | 10/7/1949 | K |
| Viola lactea x riviniana | GB, VC34 West Gloucestershire, Yate Lower Common | Cecil Ivry Sandwith Noel Yvri Sandwith | | 16/5/1948 | K |
| Veronica scutellata | GB, VC6 North Somerset, Nailsea | Cecil Ivry Sandwith Noel Yvri Sandwith | | 1/7/1947 | K |
| Ligustrum vulgare | GB, VC6 North Somerset, Cleeve Toot | Cecil Ivry Sandwith Noel Yvri Sandwith | | 29/12/1945 | K |
| Cuscuta epithymum | GB, VC6 North Somerset, Tickenham | Cecil Ivry Sandwith Noel Yvri Sandwith | | 24/9/1944 | K |
| Mentha arvensis | GB, VC6 North Somerset, Cranmore | Cecil Ivry Sandwith Noel Yvri Sandwith | | 30/7/1941 | K |
| Veronica hederifolia subsp. sublobata | GB, VC6 North Somerset, Tickenham | Cecil Ivry Sandwith | | 5/5/1941 | K |
| Linaria vulgaris | GB, VC34 West Gloucestershire, Avonmouth Docks, Bristol Cultivated | Cecil Ivry Sandwith | | 3/10/1940 | K |
| Rumex obtusifolius | GB, VC6 North Somerset, Tickenham | Cecil Ivry Sandwith | Job Edward Lousley | 2/10/1940 | SLBI |
| Callitriche truncata | GB, VC56 Nottinghamshire, Misterton | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/8/1939 | K |
| Galeopsis versicolor | GB, VC56 Nottinghamshire, Everton Carr | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/8/1939 | K |
| Hypochaeris glabra | GB, VC56 Nottinghamshire, Everton | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/8/1939 | K |
| Groenlandia densa | GB, VC54 North Lincolnshire, Haxey | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/1939 | K |
| Lamium confertum | GB, VC94 Banffshire, Cullen | Cecil Ivry Sandwith Noel Yvri Sandwith | | 22/7/1938 | K |
| Melissa officinalis | GB, VC41 Glamorganshire, Roath | Cecil Ivry Sandwith John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 6/8/1937 | K |
| Scrophularia scorodonia | GB, VC41 Glamorganshire, Cardiff, Cardiff Docks | Cecil Ivry Sandwith John Patrick Micklethwait Brenan Royston Leslie Smith | John Patrick Micklethwait Brenan | 4/8/1937 | K |
| Plantago coronopus | GB, VC1 West Cornwall, Lizard | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/6/1937 | K |
| Plantago coronopus | GB, VC6 North Somerset, Steep Holm | Cecil Ivry Sandwith John Patrick Micklethwait Brenan | | 30/5/1937 | K |
| Scrophularia umbrosa | GB, VC33 East Gloucestershire, Compton Abdale | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/10/1936 | K |
| Veronica longifolia | GB, VC18 South Essex, Dagenham | Cecil Ivry Sandwith Noel Yvri Sandwith | | 27/9/1936 | K |
| Erucastrum gallicum | GB, VC34 West Gloucestershire, Bristol | Cecil Ivry Sandwith Ivor W Evans | Harold Stuart Thompson | 13/9/1936 | BIRM |
| Mentha suaveolens | GB, VC41 Glamorganshire, Cardiff, Cardiff Docks | Cecil Ivry Sandwith Noel Yvri Sandwith | | 11/9/1936 | K |
| Scrophularia umbrosa | GB, VC33 East Gloucestershire, Compton Abdale | Cecil Ivry Sandwith Noel Yvri Sandwith | | 10/9/1936 | K |
| Scrophularia umbrosa | GB, VC33 East Gloucestershire, Compton Abdale | Cecil Ivry Sandwith Noel Yvri Sandwith | | 10/9/1936 | K |
| Veronica catenata | GB, VC34 West Gloucestershire, Wickwar | Cecil Ivry Sandwith Noel Yvri Sandwith | | 6/9/1936 | K |