+ | Astragalus danicus | GB, VC83 Midlothian, Edinburgh,Arthur's Seat | | Charles Bailey Henry Alexander Hurst William Williamson Newbould | 5/1830 | MANCH |
+ | Bromus secalinus | GB, VC21 Middlesex, Brentford | William Williamson Newbould | Charles Bailey | 6/1867 | MANCH |
+ | Bupleurum rotundifolium | GB, VC29 Cambridgeshire, Upware | William Williamson Newbould | Charles Bailey | 14/7/1856 | MANCH |
| Carex pseudocyperus | GB, VC15 East Kent, Ramsgate | William Williamson Newbould | Charles Bailey John Hardy | 24/7/1843 | MANCH |
+ | 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 |
+ | Lychnis viscaria | GB, VC83 Midlothian, Edinburgh,Arthur's Seat | William Williamson Newbould | Charles Bailey John Ray Hardy William Williamson Newbould | 5/1850 | MANCH |
+ | Medicago minima | GB, VC15 East Kent, Ramsgate,Pegwell Bay | William Williamson Newbould | Charles Bailey John Hardy | 7/1843 | 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 |
| Potamogeton pectinatus | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Charles Bailey John Hardy | 23/6/1846 | MANCH |
| Potamogeton polygonifolius | GB, VC63 South-west Yorkshire, Sheffield | William Williamson Newbould | Charles Bailey William Williamson Newbould | | MANCH |
| Potamogeton polygonifolius | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | Charles Bailey John Hardy | 23/6/1846 | 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 |
+ | 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 |
+ | Linnaea borealis | GB, VC90 Angus, Clova,Glen Doll | | Isaac Bayley Balfour William Williamson Newbould | 1857 | MANCH |
+ | Genista anglica | GB, VC29 Cambridgeshire, Gamlingay | | Charles Bailey John Barrow William Williamson Newbould | 20/5/1847 | MANCH |
+ | Chamaemelum nobile | GB, VC113 Channel Islands, Jersey, Quennevais | William Williamson Newbould | I Hardy John Ray Hardy | 9/7/1842 | MANCH |
+ | Peucedanum palustre | GB, VC31 Huntingdonshire, Holme Fen | William Williamson Newbould | Charles Bailey I Hardy John Ray Hardy | 16/9/1845 | MANCH |
+ | Carex appropinquata | GB, VC61 South-east Yorkshire, Heslington Fields | William Williamson Newbould | Charles Bailey John Hardy | 7/2/1846 | 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 |
| 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 | GB, VC29 Cambridgeshire, Barton | William Williamson Newbould | | 1850 | SLBI |
| Allium oleraceum | GB, VC29 Cambridgeshire, Barton | William Williamson Newbould | Allan Octavian Hume | 1850 | SLBI |
| Allium oleraceum | Vaud, Pais de Bey | William Williamson Newbould | Allan Octavian Hume | | 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 |
| Bromus commutatus | GB, VC21 Middlesex, Acton | William Williamson Newbould | Augustin Ley | 6/1867 | BIRM |
| Butomus umbellatus | GB, VC31 Huntingdonshire, Bluntisham | William Williamson Newbould | John Hardy | 7/1845 | MANCH |
| Carex canescens | GB, VC59 South Lancashire, White Moss | Leopold Hartley Grindon | William Williamson Newbould | 6/1841 | BM |