| Salix viminalis x caprea = S. x smithiana | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 9/7/1842 | BIRM |
| Salix viminalis x caprea = S. x smithiana | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 19/7/1842 | BIRM |
| Salix viminalis x caprea x cinerea = S. x calodendron | GB, VC19 North Essex, Audley End | John Ewbank Leefe | | 18/8/1842 | BIRM |
| Salix viminalis x caprea x cinerea = S. x calodendron | GB, VC19 North Essex, Audley End | John Ewbank Leefe | | 18/8/1842 | MANCH |
| Salix viminalis x cinerea = S. x holosericea | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Chenevix-Trench | 9/7/1842 | MANCH |
| Lathyrus aphaca | GB, VC19 North Essex, Debden | John Ewbank Leefe | Botanical Society of Edinburgh John Ewbank Leefe | 6/1840 | BON |
| Salix fragilis x alba = S. x rubens | GB, Essex Cultivated | John Ewbank Leefe | | 20/8/1868 8/5/1869 26/8/1869 | MANCH |
| Salix fragilis x alba = S. x rubens | GB, Essex | John Ewbank Leefe | | 25/4/1869 8/5/1869 26/8/1869 28/8/1869 | CGE |
| Salix fragilis x alba = S. x rubens | GB, Essex Cultivated | John Ewbank Leefe | | 28/4/1868 26/4/1869 | CGE |
| Carex arenaria | GB, VC29 Cambridgeshire, Cambridge | | John Ewbank Leefe | 5/1833 | E |
+ | 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 |
| 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 | Richmond Museum Charles Bailey James Ward | 20/4/1867 14/4/1868 7/8/1868 | MANCH |
| Salix cinerea x myrsinifolia = S. x strepida | GB, VC29 Cambridgeshire, Cambridge Botanic Gardens Cultivated | John Ewbank Leefe | Richmond Museum Charles Bailey James Ward | 5/5/1866 14/9/1866 | MANCH |
| Salix pentandra x fragilis = S. x meyeriana | GB, VC29 Cambridgeshire, Cambridge Botanic Gardens Cultivated | John Ewbank Leefe | Charles Bailey John Hardy | 11/5/1867 28/9/1867 29/4/1868 | MANCH |
| Salix pentandra x fragilis = S. x meyeriana | GB, VC29 Cambridgeshire, Cambridge Botanic Gardens Cultivated | John Ewbank Leefe | | 11/5/1867 28/9/1867 29/4/1868 | MANCH |
| Salix repens var. rosmannifolia | GB, VC29 Cambridgeshire, Cambridge Botanic Gardens | John Ewbank Leefe | | | SLBI |
| Salix repens | GB, VC29 Cambridgeshire, Cambridge Botanic Gardens Cultivated | John Ewbank Leefe | William Hadden Beeby | 14/5/1867 15/8/1867 | SLBI |
| Carex dioica | GB, VC29 Cambridgeshire, Gamlingay | John Ewbank Leefe | | | E |
| Salix aurita x myrsinifolia = S. x coriacea | GB, VC30 Bedfordshire, Woburn | Leicester Darwall | Charles Bailey John Hardy John Ewbank Leefe | 24/3/1868 to 4/4/1868 13/8/1868 | MANCH |
| Salix aurita x myrsinifolia = S. x coriacea | GB, VC30 Bedfordshire, Woburn Cultivated | John Ewbank Leefe | Charles Bailey Leicester Darwall | 24/3/1868 4/4/1868 13/8/1868 | MANCH |
| Salix aurita x myrsinifolia = S. x coriacea | GB, VC30 Bedfordshire, Woburn | Leicester Darwall | Charles Bailey John Ewbank Leefe James Ward | 24/3/1868 to 4/4/1868 13/8/1868 | MANCH |
| Salix caprea x myrsinifolia = S. x latifolia | GB, VC30 Bedfordshire, Woburn Cultivated | John Ewbank Leefe | Charles Bailey | 26/4/1867 25/4/1868 27/4/1869 21/8/1869 | MANCH |
| Salix caprea x myrsinifolia = S. x latifolia | GB, VC30 Bedfordshire, Woburn Cultivated | John Ewbank Leefe Leicester Darwall | Charles Bailey John Hardy | 19/5/1869 21/8/1869 | MANCH |
| Salix caprea x myrsinifolia = S. x latifolia | GB, VC30 Bedfordshire, Woburn | Leicester Darwall | Charles Bailey John Ewbank Leefe | 19/5/1869 21/8/1869 | MANCH |
| Salix fragilis x alba = S. x rubens | GB, VC30 Bedfordshire, Woburn | John Ewbank Leefe | Charles Bailey | 25/4/1868 8/5/1869 26/8/1869 | MANCH |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC34 West Gloucestershire, Durdham Down | Charles Cardale Babington | John Ewbank Leefe | 26/8/1836 | K |
| Mentha suaveolens | GB, VC35 Monmouthshire | | Botanical Society of Edinburgh John Ewbank Leefe | 3/10/1837 | K |
| Salix x mollissima var. hippophaefolia | GB, VC36 Herefordshire, Ross | John Ewbank Leefe | Augustin Ley | 1/4/1882 26/6/1882 | BIRM |
| Campanula patula | GB, VC38 Warwickshire, Allesley | | John Ewbank Leefe | 6/1887 | K |
| Salix purpurea | GB, VC39 Staffordshire, Bilbrook | John Ewbank Leefe | Botanical Exchange Club of The British Isles William Hadden Beeby | 12/5/1867 24/8/1867 | SLBI |
| Callitriche intermedia | GB, VC49 Caernarvonshire, Llyn Llydaw | | John Ewbank Leefe | 6/1887 | K |
| Carex otrubae | GB, VC50 Denbighshire, Chirk | John Ewbank Leefe | John Ewbank Leefe | | E |
| Teucrium scordium | GB, VC65 North-west Yorkshire, Bolton on Swale | | Richard Chandler Alexander Prior John Ewbank Leefe | 1837 | K |
| 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 pentandra | GB, VC65 North-west Yorkshire, Gilling | James Ward | John Ewbank Leefe | 2/6/1842 | SLBI |
| Carex diandra | GB, VC65 North-west Yorkshire, Halnaby | | John Ewbank Leefe | 6/1866 | E |
| Carex hirta | GB, VC65 North-west Yorkshire, Kirkby Fleetham | John Ewbank Leefe | Royal Botanic Gardens, Kew | | E |