| Veronica beccabunga | GB, VC6 North Somerset, Weston in Gordano | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/6/1930 | K |
| Ajuga reptans | GB, VC6 North Somerset, Tickenham GB, VC6 North Somerset, Wraxall | Cecil Ivry Sandwith | | 26/5/1930 | K |
| Veronica catenata | GB, VC6 North Somerset, Portbury | Cecil Ivry Sandwith Noel Yvri Sandwith | | 19/6/1929 | K |
| Plantago coronopus | GB, VC34 West Gloucestershire, Avonmouth Docks, Bristol | Cecil Ivry Sandwith | | 1/9/1928 | K |
| Mentha x verticillata var. paludosa | GB, VC6 North Somerset, Wedmore | Cecil Ivry Sandwith | | 9/8/1928 | K |
| Stachys palustris | GB, VC9 Dorset, Portland | Cecil Ivry Sandwith Noel Yvri Sandwith | | 12/7/1928 | K |
| Festuca arundinacea | GB, VC11 South Hampshire, Redbridge | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/7/1928 | K |
| Kickxia spuria | GB, VC11 South Hampshire, Hayling Island | Cecil Ivry Sandwith Noel Yvri Sandwith | | 11/9/1927 | K |
| Ajuga reptans | GB, VC6 North Somerset, Leigh Woods | Cecil Ivry Sandwith Noel Yvri Sandwith | | 15/5/1927 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC28 West Norfolk, Thetford | Cecil Ivry Sandwith | | 22/8/1926 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC28 West Norfolk, Thetford | Cecil Ivry Sandwith | | 22/8/1926 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC28 West Norfolk, Ring Mere | Cecil Ivry Sandwith Noel Yvri Sandwith | Noel Yvri Sandwith | 21/8/1926 | K |
| 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 |
| Polygonum bellardii | GB, VC34 West Gloucestershire, Avonmouth Docks, Bristol | Cecil Ivry Sandwith James Walter White | James Walter White | 27/10/1925 | SLBI |
| Teucrium resupinatum | GB, VC34 West Gloucestershire, Bristol | Cecil Ivry Sandwith Noel Yvri Sandwith | | 25/10/1925 | K |
| Mentha x piperita var. vulgaris | GB, VC6 North Somerset, Priddy | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/9/1923 | K |
| 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 |
| 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 | | 2/9/1918 | K |
| Galeopsis segetum | GB, VC56 Nottinghamshire, Everton Carr | Cecil Ivry Sandwith Noel Yvri Sandwith | | 30/8/1918 | K |
| Potamogeton gramineus | GB, VC56 Nottinghamshire, Everton Carr | Cecil Ivry Sandwith Noel Yvri Sandwith | Harold Stuart Thompson Arthur Bennett | 30/8/1918 | BIRM |
| Callitriche truncata | GB, VC56 Nottinghamshire, Misterton | Cecil Ivry Sandwith Noel Yvri Sandwith | | 8/1918 | K |
| Phalaris minor | GB, VC34 West Gloucestershire, Shirehampton | Cecil Ivry Sandwith | Harold Stuart Thompson | 7/1918 | BIRM |
| Phalaris paradoxa | GB, VC34 West Gloucestershire, Shirehampton | Cecil Ivry Sandwith | Harold Stuart Thompson | 1/7/1918 | BIRM |
| Lepidium perfoliatum | GB, VC34 West Gloucestershire, Ashton Gate | Cecil Ivry Sandwith Noel Yvri Sandwith | Harold Stuart Thompson | 5/6/1918 | BIRM |
| 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 | 19/8/1916 | BIRM |
| Arnoseris minima | GB, VC17 Surrey, Tilford | Cecil Ivry Sandwith Noel Yvri Sandwith | Harold Stuart Thompson | 16/8/1916 | BIRM |
| Teucrium chamaedrys | GB, VC11 South Hampshire, Upham | Cecil Ivry Sandwith Noel Yvri Sandwith | | 9/1915 | K |
| Leonurus cardiaca | GB, Hampshire, Selborne | Cecil Ivry Sandwith | Charles Baylis Green | 26/8/1915 | SLBI |
| Epipactis purpurata | GB, VC11 South Hampshire, Petersfield | Cecil Ivry Sandwith | Harold Stuart Thompson | 25/8/1915 | BIRM |
| Galeopsis angustifolia | GB, VC12 North Hampshire, East Tisted | Cecil Ivry Sandwith Noel Yvri Sandwith | | 22/8/1915 | K |
| Stachys alpina | GB, VC34 West Gloucestershire, Wotton-under-Edge | Cecil Ivry Sandwith | | 8/7/1915 | K |
| Wolffia arrhiza | GB, VC6 North Somerset, Ashcott, Peat Moor | Cecil Ivry Sandwith | | 19/6/1915 | SLBI |
| Scirpus caespitosus | GB, VC6 North Somerset, Black Down | Cecil Ivry Sandwith | Cedric Bucknall Harold Stuart Thompson | 2/6/1915 | BIRM |
| Orobanche hederae | GB, VC34 West Gloucestershire, Clifton | Cecil Ivry Sandwith Harold Stuart Thompson | Harold Stuart Thompson | 6/1915 | BIRM |
| Rhamnus cathartica | GB, VC34 West Gloucestershire, Clifton Down | Cecil Ivry Sandwith Harold Stuart Thompson | Harold Stuart Thompson | 6/1915 | BIRM |
| Teesdalia nudicaulis | GB, VC56 Nottinghamshire, Harworth | Cecil Ivry Sandwith | Harold Stuart Thompson | 6/1915 | BIRM |
| Viola | GB, VC6 North Somerset, Leigh Woods | Cecil Ivry Sandwith Harold Stuart Thompson | Harold Stuart Thompson | 12/5/1915 | BIRM |
| 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 |
| Carex diandra | GB, VC6 North Somerset, Ashcott | Cecil Ivry Sandwith | Charles Baylis Green | 1/6/1914 | SLBI |
| Mentha longifolia var. mollissima | GB, VC1 West Cornwall, Scilly Isles,Saint Marys | Cecil Ivry Sandwith | Harold Stuart Thompson | 9/1913 | BIRM |
| Carex acuta | GB, VC34 West Gloucestershire, Pucklechurch | Cecil Ivry Sandwith | Charles Baylis Green | 13/6/1913 | SLBI |
| Herminium monorchis | GB, VC33 East Gloucestershire, Painswick | Cecil Ivry Sandwith | Harold Stuart Thompson | | BIRM |