| Salix aurita | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 3/4/1842 19/7/1842 | BIRM |
| Salix cinerea subsp. oleifolia | | Arthur Bennett John Ewbank Leefe | Botanical Exchange Club of The British Isles Augustin Ley | | BIRM |
| Salix cinerea subsp. oleifolia | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 5/4/1842 12/8/1842 | BIRM |
| Salix cinerea subsp. oleifolia | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 4/4/1842 to 14/7/1842 | BIRM |
| Salix cinerea subsp. oleifolia | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 6/4/1842 22/7/1842 | BIRM |
| Salix cinerea subsp. oleifolia | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 28/3/1842 23/7/1842 | BIRM |
| Salix cinerea subsp. oleifolia | GB, VC65 North-west Yorkshire, Richmond | John Ewbank Leefe | Donor Unknown | 9/4/1842 to 4/7/1842 | BIRM |
| Salix purpurea | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 25/3/1842 19/7/1842 | BIRM |
| Salix purpurea x cinerea = S. x pontederiana | GB, Northumberland, Rothbury | Arthur Bennett John Ewbank Leefe | Botanical Exchange Club of The British Isles Augustin Ley | | BIRM |
| Salix purpurea x viminalis = S. x rubra | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 6/4/1842 17/7/1842 | BIRM |
| Salix purpurea x viminalis = S. x rubra | GB, Northumberland, Rothbury | John Ewbank Leefe | Augustin Ley | | BIRM |
| Salix triandra | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 9/5/1842 12/8/1842 | BIRM |
| Salix triandra | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 4/5/1842 12/8/1842 | BIRM |
| Salix triandra | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 25/4/1842 | BIRM |
| Salix triandra | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 9/5/1842 | BIRM |
| Salix triandra | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 12/8/1842 | BIRM |
| Salix triandra | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 26/4/1842 25/7/1842 | BIRM |
| Salix viminalis | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 5/4/1842 to 30/7/1842 | BIRM |
| Salix viminalis | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 5/4/1842 10/7/1842 | BIRM |
| Salix viminalis | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 19/3/1842 | BIRM |
| Salix viminalis | GB, VC19 North Essex, Audley End Cultivated | John Ewbank Leefe | Donor Unknown | 4/4/1842 | BIRM |
| Salix viminalis | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 22/3/1842 4/4/1842 | BIRM |
| Salix viminalis | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 12/7/1842 | BIRM |
| Salix viminalis | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 4/4/1842 | BIRM |
| Salix viminalis | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 16/7/1842 | BIRM |
| Salix viminalis | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 12/7/1842 | BIRM |
| Salix viminalis | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 12/8/1842 | BIRM |
| Salix viminalis x caprea = S. x smithiana | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 15/4/1842 | BIRM |
| Salix viminalis x caprea = S. x smithiana | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 19/3/1842 | 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 = S. x smithiana | GB, VC19 North Essex, Audley End | John Ewbank Leefe | Donor Unknown | 24/4/1842 16/8/1842 | BIRM |
| 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 x aurita = S. x stipularis | GB, VC85 Fifeshire, Balmuto Cultivated | John Ewbank Leefe | Augustin Ley John Thomas Irvine Boswell-Syme | 10/1877 | BIRM |
| Salix viminalis x caprea x cinerea = S. x calodendron | GB, VC19 North Essex, Audley End | John Ewbank Leefe | | 18/8/1842 | BIRM |
| Salix x mollissima var. hippophaefolia | | Arthur Bennett John Ewbank Leefe | Botanical Exchange Club of The British Isles Augustin Ley | | BIRM |
| Salix x mollissima var. hippophaefolia | GB, VC36 Herefordshire, Ross | John Ewbank Leefe | Augustin Ley | 1/4/1882 26/6/1882 | BIRM |
| 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, VC19 North Essex, Audley End | John Ewbank Leefe | Charles Cardale Babington | 5/4/1839 to 5/6/1840 | CGE |
| 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 |