| Asparagus officinalis | GB, VC1 West Cornwall, Lizard | William Williamson Newbould | | 8/1874 | SLBI |
| Viola hirta | GB, VC3 South Devon, Plymouth | Thomas Richard Archer Briggs | George Nicholson William Hadden Beeby William Williamson Newbould | 14/4/1882 | SLBI |
| Euphorbia hyberna | GB, VC4 North Devon, Linton | William Williamson Newbould | | 6/1850 | SLBI |
| Euphorbia hyberna | GB, VC4 North Devon, Lynton | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 6/1850 | SLBI |
| Carex echinata | GB, VC5 South Somerset, Dunkery Hill | William Williamson Newbould | | 7/2/1850 | BM |
| Carex muricata subsp. pairae | GB, VC5 South Somerset, Dunster | William Williamson Newbould | | 25/6/1850 | BM |
| Carex divisa | GB, VC10 Isle of Wight, Gurnard Bay | Frederick Townsend | Frederick Townsend William Williamson Newbould | 6/1844 | BM |
+ | Mentha pulegium | GB, Hampshire, River Erith | William Williamson Newbould | John Ray Hardy Susannah Mary Payne | 1841 | MANCH |
| Aethusa cynapium subsp. agrestis | GB, VC13 West Sussex, Chichester | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 10/1843 | SLBI |
| Carex vulpina | GB, VC13 West Sussex, Chichester | | John Thomas Irvine Boswell-Syme William Williamson Newbould | 6/1843 | BM |
| Dianthus armeria | GB, VC13 West Sussex, Chichester | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 10/1843 | SLBI |
| Dipsacus fullonum | GB, VC13 West Sussex, Chichester | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 1843 | SLBI |
+ | Euphorbia exserta | GB, VC13 West Sussex, Chichester | William Williamson Newbould | John Hardy | 10/1843 | MANCH |
| Limonium humile | GB, VC13 West Sussex, Chichester | | Frederick Townsend William Williamson Newbould | 7/1843 | SLBI |
| Potamogeton polygonifolius | GB, VC13 West Sussex, Chichester | William Williamson Newbould | John Hardy | 10/1843 | MANCH |
| Puccinellia distans | GB, VC13 West Sussex, Chichester | William Williamson Newbould | William Hillhouse | 1842 | BIRM |
| Ruppia rostellata | GB, VC13 West Sussex, Chichester | William Williamson Newbould | Frederick Townsend | 9/1844 | SLBI |
| Sagittaria sagittifolia | GB, VC13 West Sussex, Chichester | William Williamson Newbould | Frederick Townsend | 10/1846 | SLBI |
| Stachys sylvatica | GB, VC13 West Sussex, Chichester | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 1843 | SLBI |
| Suaeda maritima | GB, VC13 West Sussex, Chichester | William Williamson Newbould | | 29/9/1843 | 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 |
| Cephalanthera longifolia | GB, VC13 West Sussex, Goodwood | William Williamson Newbould | Allan Octavian Hume Frederick Townsend William Williamson Newbould | 6/10/1843 | SLBI |
| Cephalanthera longifolia | GB, VC13 West Sussex, Goodwood | William Williamson Newbould | | 6/1843 | SLBI |
+ | Neottia nidus-avis | GB, VC13 West Sussex, Goodwood | William Williamson Newbould | John Ray Hardy | 6/1843 | MANCH |
| Carex flacca | GB, VC13 West Sussex, Mundham | William Williamson Newbould | | 1843 | E |
+ | Vicia lutea | GB, VC13 West Sussex, Shoreham | | William Williamson Newbould | 5/7/1832 | MANCH |
| Carex pseudocyperus | GB, VC15 East Kent, Ramsgate | William Williamson Newbould | Charles Bailey John Hardy | 24/7/1843 | MANCH |
| Lepidium draba | GB, VC15 East Kent, Ramsgate | William Williamson Newbould | | 7/1843 | SLBI |
+ | Medicago minima | GB, VC15 East Kent, Ramsgate,Pegwell Bay | William Williamson Newbould | Charles Bailey John Hardy | 7/1843 | MANCH |
+ | Silene conica | GB, VC15 East Kent, Ramsgate,Pegwell Bay | William Williamson Newbould | Charles Bailey John Ray Hardy | 20/7/1882 | MANCH |
| Carex pseudocyperus | GB, VC15 East Kent, Sandwich | William Williamson Newbould | John Thomas Irvine Boswell-Syme Frederick Janson Hanbury | 20/7/1843 | BM |
| Silene conica | GB, VC15 East Kent, Sandwich | William Williamson Newbould | | 8/1843 | K |
| Lathyrus japonicus subsp. maritimus | GB, VC15 East Kent, Walmer Castle | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 7/1843 | SLBI |
| Lathyrus japonicus subsp. maritimus | GB, VC15 East Kent, Walmer Castle | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 8/1843 | SLBI |
| Lamium album | GB, VC17 Surrey, Kew | William Williamson Newbould | William Hadden Beeby | 5/1885 | SLBI |
| Polygonum aviculare | GB, VC17 Surrey, Norwood | Frederick Townsend William Williamson Newbould | Allan Octavian Hume | 27/8/1864 | SLBI |
| Arctium nemorosum | GB, VC17 Surrey, Surbiton | William Williamson Newbould | William Hadden Beeby | 8/1883 | SLBI |
| Lathyrus tuberosus | GB, VC18 South Essex, Canvey Island | Frederick Arnold Lees William Williamson Newbould | Frederick Arnold Lees William Hadden Beeby | 21/6/1872 | 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 |