| Mentha arvensis x aquatica = M. x verticillata | GB, VC35,VC41, llanedeyrn, Cardiff | Arthur Edward Wade | National Museum of Wales Job Edward Lousley | 5/8/1941 | K |
| Mentha spicata x suaveolens = M. x villosa | GB, VC41 Glamorganshire, Cardiff | Arthur Edward Wade | Botanical Society & Exchange Club of The British Isles National Museum of Wales | 26/8/1947 | SLBI |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC41 Glamorganshire, Cardiff | Arthur Edward Wade | Botanical Society & Exchange Club of The British Isles National Museum of Wales | 26/8/1947 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC41 Glamorganshire, Cardiff | Arthur Edward Wade | Botanical Society & Exchange Club of The British Isles | 26/8/1947 | OXF |
| Mentha spicata x suaveolens = M. x villosa | GB, VC41 Glamorganshire, Llanedeyrn | Arthur Edward Wade | Job Edward Lousley | 5/8/1941 | K |
| Mentha spicata x suaveolens = M. x villosa | GB, VC41 Glamorganshire, Peterston-super-Ely | Arthur Edward Wade Charles Edward Britton | Botanical Exchange Club of The British Isles National Museum of Wales | 7/1921 | K |
+ | Mentha suaveolens x longifolia = M. x rotundifolia | GB, VC41 Glamorganshire, River Taff | Arthur Edward Wade | Sledge | 26/8/1947 | MANCH |
| Myosotis arvensis | GB, VC55 Leicestershire, Leicester, Lubbesthorpe | Arthur Edward Wade | Dulwich College | 5/1915 | SLBI |
| Myosotis discolor | GB, VC41 Glamorganshire, Dinas Powis | Arthur Edward Wade | Dulwich College Arthur Edward Wade | 5/1920 | SLBI |
| Myosotis discolor | GB, VC55 Leicestershire, Newell Wood, Pickworth | | Botanical Exchange Club of The British Isles Frederick Archibald Sowter Job Edward Lousley Arthur Edward Wade | 6/1932 | SLBI |
| Myosotis laxa subsp. caespitosa | GB, VC41 Glamorganshire, Cardiff, Llanedeyrn | Arthur Edward Wade | Botanical Exchange Club of The British Isles National Museum of Wales Job Edward Lousley | 10/7/1930 | SLBI |
| Myosotis laxa subsp. caespitosa | GB, VC35,VC41, llanedeyrn, Cardiff | Arthur Edward Wade | Botanical Society & Exchange Club of The British Isles National Museum of Wales | 10/7/1930 | SLBI |
| Neslia paniculata | GB, VC41 Glamorganshire, Splott | Arthur Edward Wade | Watson Botanical Exchange Club National Museum of Wales | 9/1925 | SLBI |
| Persicaria hydropiper | GB, VC41 Glamorganshire, Roath | Arthur Edward Wade | Dulwich College Arthur Edward Wade | 9/1920 | SLBI |
| Persicaria lapathifolia | GB, VC35 Monmouthshire, Llanrumney | Arthur Edward Wade | Botanical Exchange Club of The British Isles Job Edward Lousley | 3/10/1934 | SLBI |
| Persicaria lapathifolia | GB, VC35 Monmouthshire, Rhymney | Arthur Edward Wade | Botanical Society & Exchange Club of The British Isles National Museum of Wales Harold Stuart Thompson | 3/10/1934 | BIRM |
| Plantago major | GB, VC41 Glamorganshire, Roath | Arthur Edward Wade | Dulwich College Arthur Edward Wade | 8/1920 | SLBI |
| Plantago media var. monnieri | GB, VC41 Glamorganshire, Penarth | Arthur Edward Wade | National Museum of Wales | 6/1949 | K |
| Poa bulbosa | GB, VC41 Glamorganshire, Barry | Arthur Edward Wade | Watson Botanical Exchange Club Harold Stuart Thompson National Museum of Wales | 5/1920 | BIRM |
| Polygonum aviculare | GB, VC41 Glamorganshire, Cardiff, Splott | Arthur Edward Wade | Harold Stuart Thompson | 7/9/1931 | BIRM |
| Polygonum aviculare | GB, VC41 Glamorganshire, Cardiff, Splott | Arthur Edward Wade | Watson Botanical Exchange Club Job Edward Lousley | 7/9/1931 | SLBI |
| Polygonum aviculare | GB, VC55 Leicestershire, Braunstone | Arthur Edward Wade | Dulwich College | 9/1916 | SLBI |
| Potamogeton polygonifolius | GB, VC35 Monmouthshire, Pontnewydd | Arthur Edward Wade | Dulwich College | 7/1923 | SLBI |
| Rhinanthus minor subsp. minor | GB, VC41 Glamorganshire, Llandough | Arthur Edward Wade | Arthur Edward Wade | 5/1920 | SLBI |
| Rumex cristatus | GB, VC41 Glamorganshire, Cardiff | Arthur Edward Wade | | 11/7/1939 3/10/1939 | SLBI |
| Salicornia dolichostachya | GB, VC35 Monmouthshire, Marshfield | Arthur Edward Wade Harold Augustus Hyde | Watson Botanical Exchange Club Job Edward Lousley National Museum of Wales | | SLBI |
| Salicornia dolichostachya | GB, VC35 Monmouthshire, Marshfield | Arthur Edward Wade H A Hyde | National Museum of Wales Watson Botanical Exchange Club Job Edward Lousley | 1928 | SLBI |
| Salicornia europaea | GB, VC35 Monmouthshire, Marshfield | Arthur Edward Wade Harold Augustus Hyde | Watson Botanical Exchange Club National Museum of Wales | | SLBI |
| Salix viminalis x caprea = S. x smithiana | GB, VC55 Leicestershire, South Croxton | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Joseph Edward Little Arthur Edward Wade | 24/4/1916 28/5/1916 | CGE |
| Samolus valerandi | GB, VC41 Glamorganshire, Fairwater | Arthur Edward Wade | Dulwich College Arthur Edward Wade | 7/1921 | SLBI |
| Senecio squalidus | GB, VC41 Glamorganshire, Cardiff | Arthur Edward Wade | Job Edward Lousley | 1933 | SLBI |
| Stachys officinalis | GB, VC35 Monmouthshire, Llanrumney | Arthur Edward Wade | National Museum of Wales | 8/1941 | K |
| Stachys officinalis | GB, VC41 Glamorganshire, Llanedeyrn, Cardiff | Arthur Edward Wade | National Museum of Wales | 31/7/1953 | K |
| Stachys recta | GB, VC41 Glamorganshire, Barry Docks | Arthur Edward Wade | Harold Stuart Thompson National Museum of Wales Watson Botanical Exchange Club | | BIRM |
| Stachys recta | GB, VC41 Glamorganshire, Barry Docks | Arthur Edward Wade | Watson Botanical Exchange Club National Museum of Wales | | SLBI |
| Stachys sylvatica | GB, VC41 Glamorganshire, Cardiff | Arthur Edward Wade | | 6/1955 | K |
| Symphytum orientale | GB, VC55 Leicestershire, Leicester | Arthur Edward Wade | Dulwich College | 29/4/1911 | SLBI |
| Thymus praecox subsp. arcticus | GB, VC41 Glamorganshire, Barry Island | Arthur Edward Wade | National Museum of Wales | 7/1920 | K |
| Thymus praecox subsp. arcticus | GB, VC41 Glamorganshire, Barry Island | Arthur Edward Wade | Botanical Exchange Club of The British Isles Charles Edward Britton | 7/1920 | K |
| Thymus praecox subsp. arcticus | GB, VC41 Glamorganshire, Barry, Cold Knap | Arthur Edward Wade | Botanical Exchange Club of The British Isles Charles Edward Britton | 7/1920 | K |