| Salix fragilis x alba = S. x rubens | GB, VC65 North-west Yorkshire, Easby | James Ward | Charles Cardale Babington John Ewbank Leefe | 4/5/1842 16/7/1842 | CGE |
| Salix triandra x viminalis = S. x mollissima | | John Ewbank Leefe | John Ewbank Leefe Leicester Darwall | 14/5/1867 24/4/1869 21/8/1869 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Charles Cardale Babington | 19/3/1842 to 19/7/1842 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC19 North Essex, Audley End | John Ewbank Leefe | John Stevens Henslow | 7/5/1842 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC19 North Essex, Audley End | John Ewbank Leefe | John Stevens Henslow | 19/3/1842 19/7/1842 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC65 North-west Yorkshire, Richmond | James Ward | Charles Cardale Babington John Ewbank Leefe | 7/4/1842 27/6/1842 9/7/1842 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC65 North-west Yorkshire, Richmond | James Ward | Charles Cardale Babington John Ewbank Leefe | 11/5/1842 6/8/1842 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC65 North-west Yorkshire, Richmond | James Ward | Charles Cardale Babington John Ewbank Leefe | 25/3/1842 21/6/1842 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC65 North-west Yorkshire, Richmond | James Ward | Charles Cardale Babington John Ewbank Leefe | 9/4/1842 23/7/1842 | CGE |
| Carex acutiformis | GB, VC19 North Essex, Audley End | John Ewbank Leefe | John Ewbank Leefe | 15/5/1879 | E |
| Carex arenaria | GB, VC29 Cambridgeshire, Cambridge | | John Ewbank Leefe | 5/1833 | E |
| Carex capillaris | GB, VC66 County Durham, Teesdale, Widdybank Fell | John Ewbank Leefe | | 1836 | E |
| Carex capillaris | GB, VC66 County Durham, Teesdale,Widdybank | John Ewbank Leefe | | 1836 | E |
| Carex depauperata | GB, VC17 Surrey, Frith Hill, Godalming | Arthur Bennett | John Ewbank Leefe Royal Botanic Gardens, Kew | 6/1874 | E |
| Carex diandra | GB, VC65 North-west Yorkshire, Halnaby | | John Ewbank Leefe | 6/1866 | E |
| Carex dioica | GB, VC29 Cambridgeshire, Gamlingay | John Ewbank Leefe | | | E |
| Carex dioica | GB, VC66 County Durham, Widdybank Fell, Teesdale | John Ewbank Leefe | | 1836 | E |
| Carex hirta | GB, VC65 North-west Yorkshire, Kirkby Fleetham | John Ewbank Leefe | Royal Botanic Gardens, Kew | | E |
| Carex otrubae | GB, VC50 Denbighshire, Chirk | John Ewbank Leefe | John Ewbank Leefe | | E |
| Carex panicea | | John Ewbank Leefe | | 1836 | E |
| Carex paniculata | GB, VC19 North Essex, Audley End | John Ewbank Leefe | | 15/5/1839 | E |
| Carex remota | GB, VC6 North Somerset, Bath | Charles Cardale Babington | John Ewbank Leefe | 18/6/1834 | E |
| Carex riparia | GB, VC19 North Essex, Audley End | John Ewbank Leefe | | 15/5/1839 | E |
| Carex rostrata | GB, VC65 North-west Yorkshire, Kirkby Fleetham | | John Ewbank Leefe Royal Botanic Gardens, Kew | | E |
| Callitriche intermedia | GB, VC49 Caernarvonshire, Llyn Llydaw | | John Ewbank Leefe | 6/1887 | K |
| Callitriche stagnalis | GB, VC66 County Durham, Widdybank Fell, Teesdale | | John Ewbank Leefe | 8/1872 | K |
| Campanula patula | GB, VC38 Warwickshire, Allesley | | John Ewbank Leefe | 6/1887 | K |
| Lamium confertum | GB, VC72 Dumfriesshire, Brownhall | | Botanical Society of Edinburgh John Ewbank Leefe James Cruickshank | 9/1839 | K |
| Lamium confertum | GB, VC83 Midlothian, Edinburgh | | Botanical Society of Edinburgh John Ewbank Leefe Nicholas Tyacke | 1836 | K |
| Mentha suaveolens | GB, VC35 Monmouthshire | | Botanical Society of Edinburgh John Ewbank Leefe | 3/10/1837 | K |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC34 West Gloucestershire, Durdham Down | Charles Cardale Babington | John Ewbank Leefe | 26/8/1836 | K |
| Teucrium scordium | GB, VC65 North-west Yorkshire, Bolton on Swale | | Richard Chandler Alexander Prior John Ewbank Leefe | 1837 | K |
| Salix pentandra x fragilis = S. x meyeriana | GB, VC68 North Northumberland, Rothbury | John Ewbank Leefe | IRGMA Arthur Bennett | 5/1870 to 8/1870 | LIV |
| Salix viminalis x caprea = S. x smithiana | | John Ewbank Leefe | Liverpool University | 21/4/1866 10/10/1868 | LIV |
+ | Cerastium alpinum | GB, VC69,VC70, Helvellyn, Striding Edge | John Ewbank Leefe | Charles Bailey James Ward | | MANCH |
| Consolida regalis | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Richmond Museum Charles Bailey James Ward | 6/1840 | MANCH |
| Consolida regalis | GB, VC19 North Essex, Audley End | | John Ewbank Leefe | 1840 | MANCH |
+ | Pulsatilla vulgaris | GB, VC29 Cambridgeshire, Cambridge | John Ewbank Leefe | Charles Bailey James Ward | 4/1840 | MANCH |
| Salix aurita x myrsinifolia = S. x coriacea | GB, VC29 Cambridgeshire, Cambridge Botanic Gardens Cultivated | John Ewbank Leefe | Charles Bailey | 20/4/1867 14/4/1868 7/8/1868 | MANCH |
| Salix aurita x myrsinifolia = S. x coriacea | GB, VC29 Cambridgeshire, Cambridge Botanic Gardens Cultivated | John Ewbank Leefe | Charles Bailey | 20/4/1867 14/4/1868 7/8/1868 | MANCH |