| 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 |
| Ballota nigra | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 3/9/1846 | SLBI |
| Heracleum sphondylium | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 3/10/1846 | SLBI |
| Persicaria mitis | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 1845 | SLBI |
| Petroselinum segetum | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 9/1845 | SLBI |
| Petroselinum segetum | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 9/1845 | SLBI |
| Potamogeton pectinatus | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 23/6/1846 | SLBI |
| Rumex maritimus | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 13/9/1845 | SLBI |
| Sagittaria sagittifolia | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 5/1845 | SLBI |
| Schoenoplectus lacustris | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 6/1846 | SLBI |
| Dipsacus fullonum | GB, VC31 Huntingdonshire, Colne | William Williamson Newbould | Frederick Townsend | 1845 | SLBI |
| Mentha pulegium | GB, VC31 Huntingdonshire, Earith | William Williamson Newbould | Frederick Townsend | 9/1884 | SLBI |
| Peucedanum palustre | GB, VC31 Huntingdonshire, Holme | William Williamson Newbould | Allan Octavian Hume | 16/9/1845 | SLBI |
| Rumex maritimus | GB, VC31 Huntingdonshire, Holme Fen | William Williamson Newbould | Frederick Townsend | 16/9/1845 | SLBI |
| Lathyrus sylvestris | GB, VC41 Glamorganshire, Caswell Bay | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 12/8/1848 | SLBI |
| Potamogeton natans | GB, VC49 Caernarvonshire, Cwmffynnon | William Williamson Newbould | Frederick Townsend | 19/8/1847 | SLBI |
| Cirsium heterophyllum | GB, VC57 Derbyshire, Hathersage | William Williamson Newbould | Frederick Townsend | 1846 | SLBI |
| Myrrhis odorata | GB, VC57 Derbyshire, Hathersage | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 7/11/1846 | SLBI |
| Potamogeton polygonifolius | GB, VC63 South-west Yorkshire, Loxley | William Williamson Newbould | William Hadden Beeby | 7/6/1846 | 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 |
| 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 |
| Rubus latifolius | GB, VC83 Midlothian, Edinburgh | William Williamson Newbould | | 1846 | SLBI |
| Hammarbya paludosa | GB, VC87 West Perthshire, Inverarnan | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 8/4/1846 | SLBI |
| Hieracium strictiforme | GB, Mid-West Perthshire, Glen Falloch | Charles Cardale Babington William Williamson Newbould | Frederick Townsend | 5/8/1846 | SLBI |
| Eriophorum latifolium | GB, VC97 West Inverness-shire, Arisaig | Nicholas Tyacke William Williamson Newbould | Frederick Townsend | | SLBI |
| Polygonum oxyspermum | GB, VC113 Channel Islands, Guernsey | William Williamson Newbould | Frederick Townsend | 1841 | SLBI |
| Lotus subbiflorus | GB, VC113 Channel Islands, Guernsey, Saint Martin's | William Williamson Newbould | Frederick Townsend | 8/1841 | SLBI |
| Apium inundatum | GB, VC113 Channel Islands, Jersey, Noirmont Point | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 20/8/1842 | SLBI |
| Armeria arenaria | GB, VC113 Channel Islands, Jersey, Quennevais | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 9/1842 | SLBI |