| Sagittaria sagittifolia | GB, VC13 West Sussex, Chichester | William Williamson Newbould | Frederick Townsend | 10/1846 | SLBI |
| Cephalanthera longifolia | GB, VC13 West Sussex, Goodwood | William Williamson Newbould | | 6/1843 | SLBI |
| Cephalanthera longifolia | GB, VC13 West Sussex, Goodwood | William Williamson Newbould | Allan Octavian Hume Frederick Townsend William Williamson Newbould | 6/10/1843 | SLBI |
| Lepidium draba | GB, VC15 East Kent, Ramsgate | William Williamson Newbould | | 7/1843 | SLBI |
| 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 |
| Carex remota x vulpina = C. axilaris | GB, VC20 Hertfordshire, Buntingford | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 21/7/1848 | SLBI |
| Epipactis phyllanthes | GB, VC20 Hertfordshire, Buntingford, Throcking | William Williamson Newbould | Frederick Townsend | 8/4/1847 | SLBI |
| Rumex obtusifolius var. sylvestris | GB, VC17,VC21, Putney | William Williamson Newbould | Frederick Townsend | | SLBI |
| Urtica pilulifera | GB, VC25 East Suffolk, Lowestoft | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 1854 | SLBI |
| Crepis foetida | GB, VC26 West Suffolk, Brandon | William Williamson Newbould | Frederick Townsend | 4/7/1848 | SLBI |
| Medicago sativa subsp. falcata | GB, VC26 West Suffolk, Thetford | William Williamson Newbould | Frederick Townsend | 15/8/1851 | SLBI |
| Ranunculus baudotii | GB, VC28 West Norfolk, Burnham Norton | William Williamson Newbould | Allan Octavian Hume Charles Cardale Babington Frederick Townsend | 24/5/1852 | SLBI |
| Scleranthus annuus | GB, VC28 West Norfolk, Thetford | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 4/7/1848 | SLBI |
| Allium oleraceum | GB, VC29 Cambridgeshire, Barton | William Williamson Newbould | | 1850 | SLBI |
| Allium oleraceum | GB, VC29 Cambridgeshire, Barton | William Williamson Newbould | Allan Octavian Hume | 1850 | SLBI |
| Viola persicifolia | GB, VC29 Cambridgeshire, Bottisham | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 8/1852 | SLBI |
| 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 |
| Lathyrus aphaca | GB, VC29 Cambridgeshire, Cherry Hinton | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | | SLBI |
| Silene noctiflora | GB, VC29 Cambridgeshire, Chippenham | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 29/7/1852 | SLBI |
| Ranunculus parviflorus | GB, VC29 Cambridgeshire, Comberton | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | | SLBI |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC29 Cambridgeshire, Coton | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 26/7/1844 | SLBI |
| Galium album | GB, VC29 Cambridgeshire, Eversden | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 14/6/1848 | SLBI |
| Cerastium fontanum subsp. vulgare | GB, VC29 Cambridgeshire, Gamlingay | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 5/4/1849 | SLBI |
| Thalictrum minus | GB, VC29 Cambridgeshire, Gog Magog Hills | William Williamson Newbould | | 21/9/1851 | SLBI |
| Caucalis platycarpos | GB, VC29 Cambridgeshire, Harston | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 17/7/1848 | SLBI |
| Euphorbia platyphyllos | GB, VC29 Cambridgeshire, Toft | William Williamson Newbould | Frederick Townsend | | SLBI |
| Cuscuta europaea | GB, VC29 Cambridgeshire, Waterford | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | | SLBI |
| Cuscuta epithymum | GB, VC29 Cambridgeshire, Whittlesford | Parnell William Williamson Newbould | Frederick Townsend | | SLBI |
| Potamogeton gramineus | GB, VC29 Cambridgeshire, Wicken Fen | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 8/5/1851 | SLBI |
| Typha angustifolia | GB, VC29 Cambridgeshire, Wicken Fen | William Williamson Newbould | Frederick Townsend | 15/7/1851 | SLBI |
| Persicaria mitis | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 1845 | SLBI |
| Sagittaria sagittifolia | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 5/1845 | SLBI |
| Petroselinum segetum | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 9/1845 | SLBI |