| Silene conica | GB, VC22 Berkshire, Frilford | Noel Yvri Sandwith | | 7/6/1923 | K |
| Sium latifolium | GB, VC15 East Kent, Appledore | Noel Yvri Sandwith | | 20/9/1936 | K |
| Sorbus whiteana | GB, VC34 West Gloucestershire, Clifton Down | George Taylor Noel Yvri Sandwith | Job Edward Lousley | 20/9/1931 | SLBI |
| Stachys palustris | GB, VC6 North Somerset, Catcott | Cecil Ivry Sandwith Noel Yvri Sandwith | | 21/7/1958 | K |
| Stachys palustris | GB, VC9 Dorset, Portland | Cecil Ivry Sandwith Noel Yvri Sandwith | | 12/7/1928 | K |
| Stachys palustris | GB, VC17 Surrey, Kew | Noel Yvri Sandwith | | 23/7/1946 | K |
| Stachys palustris | GB, VC17 Surrey, Kew | Noel Yvri Sandwith | | 23/7/1946 | K |
| Stachys palustris | GB, VC45 Pembrokeshire, Pembroke | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/8/1931 | K |
| Stachys sylvatica | GB, VC9 Dorset, Studland | Noel Yvri Sandwith | | 3/8/1940 | K |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC6 North Somerset, Walton in Gordano | Noel Yvri Sandwith | | 9/1920 | K |
| Teucrium chamaedrys | GB, VC11 South Hampshire, Upham | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/1915 | K |
| Teucrium resupinatum | GB, VC34 West Gloucestershire, Bristol | Cecil Ivry Sandwith Noel Yvri Sandwith | | 25/10/1925 | K |
| Teucrium scorodonia | GB, VC92 South Aberdeenshire, Potarch Bridge | Noel Yvri Sandwith | | 26/7/1938 | K |
| Thlaspi perfoliatum | GB, VC33 East Gloucestershire, Snowshill | Cecil Ivry Sandwith Noel Yvri Sandwith | Harold Stuart Thompson | 23/4/1919 | BIRM |
| Thymus chamaedrys | GB, VC21 Middlesex, Harefield | Noel Yvri Sandwith | Noel Yvri Sandwith | 24/8/1947 | K |
| Thymus chamaedrys | GB, VC40 Shropshire, Stokesay Castle | Noel Yvri Sandwith | Noel Yvri Sandwith | 17/9/1963 | K |
| Thymus praecox subsp. arcticus | GB, VC17 Surrey, Clandon Downs, Surrey | Noel Yvri Sandwith | | 6/7/1945 | K |
| Thymus praecox subsp. arcticus | GB, VC52 Anglesey, South Stack | Noel Yvri Sandwith | | 1/7/1943 | K |
| Thymus praecox subsp. arcticus | GB, VC88 Mid Perthshire, Ben Lawers,Lochan nan Cat | Noel Yvri Sandwith | | 18/7/1948 | K |
| Thymus praecox subsp. arcticus | GB, VC96 East Inverness-shire, Glen Affric | Noel Yvri Sandwith | | 12/7/1947 | K |
| Torilis arvensis | GB, VC12 North Hampshire, Odiham | Noel Yvri Sandwith | | 14/8/1927 | K |
| Torilis arvensis | GB, VC12 North Hampshire, Odiham | Noel Yvri Sandwith | | 14/8/1927 | 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 |
| Verbascum phlomoides | GB, VC31 Huntingdonshire | John Lester Gilbert Noel Yvri Sandwith | | 4/7/1958 | K |
| Verbascum phlomoides | GB, VC31 Huntingdonshire, Great Staughton | John Lester Gilbert Noel Yvri Sandwith | | 4/8/1958 | K |
| Verbascum phlomoides | GB, VC31 Huntingdonshire, Great Staughton | John Lester Gilbert Noel Yvri Sandwith | | 4/8/1958 | K |
| Verbascum thapsus x nigrum = V. x semialbum | GB, VC17 Surrey, Mickleham Downs | Noel Yvri Sandwith | | 19/7/1941 | K |
| Verbascum thapsus x nigrum = V. x semialbum | GB, VC17 Surrey, Mickleham Downs | Noel Yvri Sandwith | | 24/8/1941 | K |
| Verbascum thapsus x nigrum = V. x semialbum | GB, VC17 Surrey, Mickleham Downs | Noel Yvri Sandwith | | 19/7/1941 | K |
| Veronica agrestis | GB, VC17 Surrey, Kew | Noel Yvri Sandwith | | 27/4/1946 | K |
| Veronica agrestis | GB, VC45 Pembrokeshire, Saint David's | Cecil Ivry Sandwith Noel Yvri Sandwith | | 17/8/1931 | K |
| Veronica agrestis | GB, VC48 Merionethshire, Tywyn, Broadwater | Noel Yvri Sandwith | | 14/8/1954 | K |
| Veronica agrestis | GB, VC96 East Inverness-shire, Cannich | Noel Yvri Sandwith | | 19/7/1947 | K |
| Veronica anagallis-aquatica | GB, VC9 Dorset, Wareham | Noel Yvri Sandwith | | 27/8/1933 | K |
| Veronica anagallis-aquatica | GB, VC9 Dorset, Wool | Noel Yvri Sandwith | | 27/8/1933 | K |
| Veronica anagallis-aquatica | GB, VC12 North Hampshire, Dipley Mill | Noel Yvri Sandwith | | 13/6/1948 | K |
| Veronica anagallis-aquatica | GB, VC64 Mid-west Yorkshire, Buckden | Noel Yvri Sandwith | | 10/7/1947 | K |
| Veronica anagallis-aquatica | GB, VC64 Mid-west Yorkshire, hawkswick | Noel Yvri Sandwith | | 5/7/1934 | K |
| Veronica arvensis | GB, VC17 Surrey, Richmond Park | Edgar Wolston Bertram Handsley Milne-Redhead Noel Yvri Sandwith | | 12/5/1931 | K |