| Mentha aquatica x spicata = M. x piperita | GB, VC28 West Norfolk, Roydon Common | Eric Lister Swann | Botanical Society of The British Isles Eric Lister Swann | 29/8/1950 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC70 Cumberland, Skirwith | Clara Winsome Muirhead | Botanical Society of The British Isles Carlisle Museum Herbarium | 27/8/1949 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC17 Surrey, Sanderstead | | Botanical Society of The British Isles Donald Peter Young | 14/8/1951 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC13 West Sussex, Bexley Hill | Edward Charles Wallace | Botanical Society of The British Isles | 22/8/1948 | SLBI |
| Mentha arvensis x spicata = M. x gracilis | GB, VC17 Surrey, Sanderstead | | Botanical Society of The British Isles Donald Peter Young | 14/8/1951 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC64 Mid-west Yorkshire, Nunwick | Catherine Muriel Rob | Botanical Society of The British Isles Druce Herbarium, Oxford Catherine Muriel Rob | 11/9/1947 | OXF |
+ | Mentha arvensis x spicata = M. x gracilis | GB, VC64 Mid-west Yorkshire, Ripon (near),River Ure | Catherine Muriel Rob | Botanical Society of The British Isles Sledge | 11/9/1947 | MANCH |
+ | Mentha arvensis x spicata = M. x gracilis | GB, VC64 Mid-west Yorkshire, Ripon (near),River Ure | Catherine Muriel Rob | Botanical Society of The British Isles Sledge | 11/9/1947 | MANCH |
| Mentha gentilis var. varigata | GB, VC13 West Sussex, Bexley Hill | Edward Charles Wallace | Botanical Society of The British Isles | 22/8/1948 | K |
| Mentha longifolia | GB, VC13 West Sussex, Amberley | Edward Charles Wallace | Botanical Society of The British Isles | 8/8/1953 | SLBI |
| Mentha spicata | GB, VC1 West Cornwall, Perranzabuloe,Lambourne Hill | Francis Rilstone | Botanical Society of The British Isles | 23/8/1948 | K |
| Mentha spicata | GB, VC77 Lanarkshire, Liberton | Clara Winsome Muirhead | Botanical Society of The British Isles | 3/10/1953 | K |
| Mentha spicata | GB, VC21 Middlesex, Northwood Cultivated GB, VC90 Angus, Glamis | Rex Alan Henry Graham | Botanical Society of The British Isles Rex Alan Henry Graham | 15/8/1952 | K |
| Mentha spicata | GB, VC91 Kincardineshire, St Cyrus Cultivated | | Botanical Society of The British Isles Rex Alan Henry Graham | 15/9/1952 | K |
| Mentha spicata x longifolia = M. x villosonervata | GB, VC28 West Norfolk, Leziate Heath | | Botanical Society of The British Isles Eric Lister Swann | 1/8/1950 | K |
| Mentha spicata x suaveolens = M. x villosa | GB, VC21 Middlesex, Northwood Cultivated GB, VC91 Kincardineshire, Garvock | Rex Alan Henry Graham | Botanical Society of The British Isles Rex Alan Henry Graham | 15/8/1952 | K |
| Mentha x piperita | GB, VC28 West Norfolk, Dersingham | Eric Lister Swann | Botanical Society of The British Isles | 31/8/1950 | K |
| Mentha x piperita var. vulgaris | GB, VC28 West Norfolk, Roydon Common | | Botanical Society of The British Isles Eric Lister Swann | 29/8/1950 | K |
| Mentha x piperita | GB, VC37 Worcestershire, Alfrick Cultivated | Rex Alan Henry Graham | Botanical Society of The British Isles Rex Alan Henry Graham | 16/8/1952 | K |
| Mentha x verticillata var. paludosa | GB, VC91 Kincardineshire, Banchory | | Botanical Society of The British Isles Rex Alan Henry Graham | 10/9/1952 | K |
| Oenanthe lachenalii | IE, VCH12 Co. Wexford, Castlebridge | Botanical Society of The British Isles | | 29/8/1977 | GALW |
| Orchis mascula | GB, VC14 East Sussex, Ashurst Wood | Florence Potter | Botanical Society of The British Isles Christopher Robert Billups | 15/5/1907 | SLBI |
+ | Otanthus maritimus | IE, VCH12 Co. Wexford, Rosslare | John Norton Mills | Botanical Society of The British Isles John Norton Mills | 31/8/1953 | MANCH |
+ | Otanthus maritimus | IE, VCH12 Co. Wexford, Rosslare | John Norton Mills | Botanical Society of The British Isles | 31/8/1953 | MANCH |
+ | Otanthus maritimus | IE, VCH12 Co. Wexford, Rosslare | John Norton Mills | Botanical Society of The British Isles John Norton Mills | 31/8/1953 | MANCH |
| Phalaris arundinacea | GB, VC41 Glamorganshire, Cardiff | Ruth Davies | Botanical Society of The British Isles National Museum of Wales | 6/1951 | K |
| Rosa stylosa x canina = R. x andegavensis | GB, VC23 Oxfordshire, Bampton | Percival George Beak | Botanical Society of The British Isles | 8/1934 | SLBI |
| Salicornia europaea | IE, VCH12 Co. Wexford, Lady's Island | Botanical Society of The British Isles | | 30/8/1977 | GALW |
| Scutellaria minor | GB, VC17 Surrey, Epsom Common | Charles Edward Britton | Botanical Society of The British Isles Edward Charles Wallace | 1/9/1928 | K |
| Senecio inaequidens | GB, VC30 Bedfordshire, Biggleswade Cultivated | Job Edward Lousley | Botanical Society of The British Isles | 13/7/1952 | SLBI |
| Sisymbrium orientale | GB, VC55 Leicestershire, Aylestone | Edward Kidston Horwood | Botanical Society of The British Isles | 12/8/1954 | SLBI |
| Sisymbrium pannonicum | GB, VC55 Leicestershire, Aylestone | Edward Kidston Horwood | Botanical Society of The British Isles | 4/8/1954 | SLBI |
| Sium latifolium | GB, VC61 South-east Yorkshire, Withernsea | Robert Lewis | Botanical Society of The British Isles Robert Lewis | 4/9/1948 | K |
| Stachys | GB, VC1 West Cornwall, Lambourne | Francis Rilstone | Botanical Society of The British Isles | 23/8/1948 | K |
| Stachys | GB, VC14 East Sussex, Ashurst Wood | Christopher Robert Billups | Botanical Society of The British Isles Christopher Robert Billups | 20/7/1904 | K |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC1 West Cornwall, Perranzabuloe,Lambourne Hill | Francis Rilstone | Botanical Society of The British Isles Francis Rilstone | 23/8/1948 | K |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC39 Staffordshire, Whitmore | Eric Smoothy Edees | Botanical Society of The British Isles Eric Smoothy Edees | 12/7/1949 | K |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC65 North-west Yorkshire, Tanfield | Catherine Muriel Rob | Botanical Society of The British Isles Catherine Muriel Rob | 20/7/1947 | MANCH |
| Thymus praecox subsp. arcticus | GB, Suffolk, Eriswell | Christopher Donald Pigott | Botanical Society of The British Isles Cambridge University | 7/1951 | K |
+ | Tordylium maximum | GB, VC18 South Essex, Tilbury | John Norton Mills | Botanical Society of The British Isles John Norton Mills | 1950 | MANCH |
+ | Tordylium maximum | GB, VC18 South Essex, Tilbury | John Norton Mills | Botanical Society of The British Isles John Norton Mills | 1950 | MANCH |
+ | Tordylium maximum | GB, VC18 South Essex, Tilbury | John Norton Mills | Botanical Society of The British Isles John Norton Mills | 1950 | MANCH |