+ | Genista anglica | GB, VC63 South-west Yorkshire, Sheffield | William Williamson Newbould | Charles Bailey William Williamson Newbould | 1839 | MANCH |
+ | Groenlandia densa | GB, VC29 Cambridgeshire, Cambridge (N of),Swaffham | George Bitton Jermyn | Charles Bailey William Williamson Newbould | 7/1836 | MANCH |
+ | Hyoscyamus niger | GB, England, Cambridge | William Williamson Newbould | Charles Bailey John Hardy | 1844 | MANCH |
+ | Limonium binervosum subsp. sarniensis | GB, VC113 Channel Islands, Guernsey | William Williamson Newbould | Charles Bailey | 8/1841 | MANCH |
+ | Linnaea borealis | GB, VC90 Angus, Clova,Glen Doll | | Isaac Bayley Balfour William Williamson Newbould | 1857 | MANCH |
+ | Lychnis alpina | GB, VC90 Angus, Little Kilrannoch [Little Gilrannoch] | James MacNab William Williamson Newbould | Charles Bailey James MacNab John Harbord Lewis | 7/1832 | MANCH |
+ | Lychnis viscaria | GB, VC83 Midlothian, Edinburgh,Arthur's Seat | William Williamson Newbould | Charles Bailey John Ray Hardy William Williamson Newbould | 5/1850 | MANCH |
+ | Lychnis viscaria | GB, VC89 East Perthshire, Den of Balthayock | William Williamson Newbould | John Ray Hardy | 7/1849 | MANCH |
+ | Medicago minima | GB, VC15 East Kent, Ramsgate,Pegwell Bay | William Williamson Newbould | Charles Bailey John Hardy | 7/1843 | MANCH |
+ | Mentha pulegium | GB, Hampshire, River Erith | William Williamson Newbould | John Ray Hardy Susannah Mary Payne | 1841 | MANCH |
+ | Neottia nidus-avis | GB, VC13 West Sussex, Goodwood | William Williamson Newbould | John Ray Hardy | 6/1843 | MANCH |
| Orchis mascula | GB, VC31 Huntingdonshire, Holme Fen | William Williamson Newbould | Charles Bailey John Hardy | 1846 | MANCH |
+ | Oxytropis campestris | GB, VC90 Angus, Clova,Glen Doll | | Charles Bailey William Williamson Newbould | 8/9/1830 | MANCH |
+ | Peucedanum palustre | GB, VC31 Huntingdonshire, Holme Fen | William Williamson Newbould | Charles Bailey I Hardy John Ray Hardy | 16/9/1845 | MANCH |
| Potamogeton pectinatus | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Charles Bailey John Hardy | 23/6/1846 | MANCH |
| Potamogeton polygonifolius | GB, VC13 West Sussex, Chichester | William Williamson Newbould | John Hardy | 10/1843 | MANCH |
| 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, Sheffield | William Williamson Newbould | Charles Bailey William Williamson Newbould | | MANCH |
+ | Ranunculus | GB, VC29 Cambridgeshire, Haddenham | William Williamson Newbould | Charles Bailey John Ray Hardy | 6/9/1846 | MANCH |
| Rumex crispus x obtusifolius = R. x pratensis | GB, VC20 Hertfordshire, Broxbourne | William Williamson Newbould | Charles Bailey William Williamson Newbould | 19/7/1848 | MANCH |
+ | Scandix pecten-veneris | GB, VC62 North-east Yorkshire, Whitby,Saltwick Bay | William Williamson Newbould | | 1844 | MANCH |
+ | Scleranthus annuus | GB, VC113 Channel Islands, Sark | William Williamson Newbould | Charles Bailey | 24/8/1842 | MANCH |
+ | Silene conica | GB, VC15 East Kent, Ramsgate,Pegwell Bay | William Williamson Newbould | Charles Bailey John Ray Hardy | 20/7/1882 | MANCH |
+ | Spiranthes spiralis | GB, VC63 South-west Yorkshire, Doncaster | William Williamson Newbould | Charles Bailey John Ray Hardy | 9/1843 | MANCH |
+ | Teesdalia nudicaulis | GB, VC29 Cambridgeshire, Gamlingay | William Williamson Newbould | Charles Bailey John Ray Hardy | 3/4/1842 | MANCH |
+ | Vicia lutea | GB, VC13 West Sussex, Shoreham | | William Williamson Newbould | 5/7/1832 | MANCH |
| Achillea maritima | GB, VC113 Channel Islands, Jersey, Saint Ouen's | William Williamson Newbould | Frederick Townsend | 9/7/1862 | SLBI |
| Aethusa cynapium subsp. agrestis | GB, VC13 West Sussex, Chichester | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 10/1843 | SLBI |
| Allium oleraceum | Vaud, Pais de Bey | William Williamson Newbould | Allan Octavian Hume | | 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 |
| Apium inundatum | GB, VC113 Channel Islands, Jersey, Noirmont Point | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 20/8/1842 | SLBI |
| Arctium nemorosum | GB, VC17 Surrey, Surbiton | William Williamson Newbould | William Hadden Beeby | 8/1883 | SLBI |
| Armeria arenaria | GB, VC113 Channel Islands, Jersey, Quennevais | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 9/1842 | SLBI |
| Asparagus officinalis | GB, VC1 West Cornwall, Lizard | William Williamson Newbould | | 8/1874 | SLBI |
| Ballota nigra | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Frederick Townsend | 3/9/1846 | SLBI |
| Carex remota x vulpina = C. axilaris | GB, VC20 Hertfordshire, Buntingford | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 21/7/1848 | SLBI |
| Caucalis platycarpos | GB, VC29 Cambridgeshire, Harston | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 17/7/1848 | SLBI |
| Centaurea nigra | GB, VC61,VC62,VC64, York | William Williamson Newbould | Frederick Townsend William Williamson Newbould | 1/7/1846 | SLBI |