| Cerastium fontanum subsp. vulgare | GB, VC29 Cambridgeshire, Gamlingay | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 5/4/1849 | SLBI |
| Lathyrus sylvestris | GB, VC41 Glamorganshire, Caswell Bay | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 12/8/1848 | SLBI |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC20 Hertfordshire, Buntingford | William Williamson Newbould | | 21/7/1848 | BM |
| Carex remota x vulpina = C. axilaris | GB, VC20 Hertfordshire, Buntingford | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 21/7/1848 | SLBI |
| Rumex crispus x obtusifolius = R. x pratensis | GB, VC19 North Essex, Broxbourne | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 19/7/1848 | SLBI |
| Rumex crispus x obtusifolius = R. x pratensis | GB, VC20 Hertfordshire, Broxbourne | William Williamson Newbould | Charles Bailey William Williamson Newbould | 19/7/1848 | MANCH |
| Caucalis platycarpos | GB, VC29 Cambridgeshire, Harston | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 17/7/1848 | SLBI |
| Crepis foetida | GB, VC26 West Suffolk, Brandon | William Williamson Newbould | Frederick Townsend | 4/7/1848 | SLBI |
| Scleranthus annuus | GB, VC28 West Norfolk, Thetford | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 4/7/1848 | SLBI |
| Galium album | GB, VC29 Cambridgeshire, Eversden | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 14/6/1848 | SLBI |
| Potamogeton natans | GB, VC49 Caernarvonshire, Cwmffynnon | William Williamson Newbould | Frederick Townsend | 19/8/1847 | SLBI |
| Carex remota | GB, VC20 Hertfordshire, Buntingford | William Williamson Newbould | William Williamson Newbould | 3/8/1847 | BM |
| Potamogeton coloratus | GB, VC29 Cambridgeshire, Bottisham Fen | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 23/7/1847 | SLBI |
| Potamogeton polygonifolius | GB, VC29 Cambridgeshire, Bottisham Fen | William Williamson Newbould | William Williamson Newbould | 23/7/1847 | SLBI |
| Carex divisa | GB, VC27 East Norfolk, Yarmouth | William Williamson Newbould | | 7/7/1847 | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC19 North Essex, Inworth | Ezekiel George Varenne | William Williamson Newbould | 7/1847 | BM |
| Carex paniculata | GB, VC25 East Suffolk, Belton Fen | William Williamson Newbould | | 8/6/1847 | BM |
| Carex spicata | GB, VC29 Cambridgeshire, Thriplow | William Williamson Newbould | Frederick Janson Hanbury John Thomas Irvine Boswell-Syme | 28/5/1847 | BM |
+ | Genista anglica | GB, VC29 Cambridgeshire, Gamlingay | | Charles Bailey John Barrow William Williamson Newbould | 20/5/1847 | MANCH |
| Epipactis phyllanthes | GB, VC20 Hertfordshire, Buntingford, Throcking | William Williamson Newbould | Frederick Townsend | 8/4/1847 | SLBI |
| Rubus latifolius | GB, VC83 Midlothian, Cramond Bridge | William Williamson Newbould | | 8/11/1846 | SLBI |
| Scrophularia umbrosa | GB, VC83 Midlothian, Cramond Bridge | William Williamson Newbould | Frederick Townsend | 8/11/1846 | SLBI |
| Myrrhis odorata | GB, VC57 Derbyshire, Hathersage | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 7/11/1846 | SLBI |
| Heracleum sphondylium | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 3/10/1846 | SLBI |
| Sagittaria sagittifolia | GB, VC13 West Sussex, Chichester | William Williamson Newbould | Frederick Townsend | 10/1846 | SLBI |
+ | Ranunculus | GB, VC29 Cambridgeshire, Haddenham | William Williamson Newbould | Charles Bailey John Ray Hardy | 6/9/1846 | MANCH |
| Ballota nigra | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 3/9/1846 | SLBI |
| Hieracium strictiforme | GB, Mid-West Perthshire, Glen Falloch | Charles Cardale Babington William Williamson Newbould | Frederick Townsend | 5/8/1846 | SLBI |
| Lamium maculatum | GB, VC63 South-west Yorkshire, Sheffield | William Williamson Newbould | Frederick Townsend | 18/7/1846 | SLBI |
| Centaurea nigra | GB, VC61,VC62,VC64, York | William Williamson Newbould | Frederick Townsend William Williamson Newbould | 1/7/1846 | SLBI |
| Trifolium squamosum | GB, VC13 West Sussex, Chichester | William Williamson Newbould | | 7/1846 | SLBI |
| Trifolium squamosum | GB, VC13 West Sussex, Chichester | William Williamson Newbould | | 7/1846 | SLBI |
| Potamogeton pectinatus | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Charles Bailey John Hardy | 23/6/1846 | MANCH |
| Potamogeton pectinatus | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 23/6/1846 | SLBI |
| Potamogeton polygonifolius | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Charles Bailey John Hardy | 23/6/1846 | MANCH |
| Potamogeton polygonifolius | GB, VC63 South-west Yorkshire, Longley | William Williamson Newbould | John Ray Hardy | 7/6/1846 | MANCH |
| Potamogeton polygonifolius | GB, VC63 South-west Yorkshire, Loxley | William Williamson Newbould | William Hadden Beeby | 7/6/1846 | SLBI |
| Carex riparia | GB, VC31 Huntingdonshire, Somersham | William Williamson Newbould | Frederick Janson Hanbury John Thomas Irvine Boswell-Syme | 6/1846 | BM |
| Schoenoplectus lacustris | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 6/1846 | SLBI |
| Hammarbya paludosa | GB, VC87 West Perthshire, Inverarnan | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 8/4/1846 | SLBI |