| Allium oleraceum | Vaud, Pais de Bey | William Williamson Newbould | Allan Octavian Hume | | SLBI |
| Carex lasiocarpa | GB, VC108 West Sutherland, Glen Canish | | John Thomas Irvine Boswell-Syme Nicholas Tyacke William Williamson Newbould Frederick Janson Hanbury | | BM |
| Carex leporina | GB, VC63 South-west Yorkshire, Aldwarke | | John Thomas Irvine Boswell-Syme William Williamson Newbould | | BM |
| Carex maritima | GB, VC108 West Sutherland, Polin | | William Williamson Newbould | | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC20 Hertfordshire, Layston | William Williamson Newbould | | | BM |
| Cuscuta epithymum | GB, VC29 Cambridgeshire, Whittlesford | Parnell William Williamson Newbould | Frederick Townsend | | SLBI |
| Cuscuta europaea | GB, VC29 Cambridgeshire, Waterford | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | | SLBI |
| Eriophorum latifolium | GB, VC97 West Inverness-shire, Arisaig | Nicholas Tyacke William Williamson Newbould | Frederick Townsend | | SLBI |
| Euphorbia platyphyllos | GB, VC29 Cambridgeshire, Toft | William Williamson Newbould | Frederick Townsend | | SLBI |
| Lathyrus aphaca | GB, VC29 Cambridgeshire, Cherry Hinton | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | | SLBI |
| Potamogeton polygonifolius | GB, VC63 South-west Yorkshire, Sheffield | William Williamson Newbould | Charles Bailey William Williamson Newbould | | MANCH |
| Ranunculus parviflorus | GB, VC29 Cambridgeshire, Comberton | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | | SLBI |
| Rumex obtusifolius var. sylvestris | GB, VC17,VC21, Putney | William Williamson Newbould | Frederick Townsend | | SLBI |
+ | Astragalus danicus | GB, VC83 Midlothian, Edinburgh,Arthur's Seat | | Charles Bailey Henry Alexander Hurst William Williamson Newbould | 5/1830 | MANCH |
+ | Oxytropis campestris | GB, VC90 Angus, Clova,Glen Doll | | Charles Bailey William Williamson Newbould | 8/9/1830 | 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 |
+ | Vicia lutea | GB, VC13 West Sussex, Shoreham | | William Williamson Newbould | 5/7/1832 | MANCH |
| Limonium vulgare | GB, VC113 Channel Islands, Saint Sampson's, Guernsey | William Williamson Newbould | | 1/9/1835 | SLBI |
+ | Groenlandia densa | GB, VC29 Cambridgeshire, Cambridge (N of),Swaffham | George Bitton Jermyn | Charles Bailey William Williamson Newbould | 7/1836 | MANCH |
+ | Genista anglica | GB, VC63 South-west Yorkshire, Sheffield | William Williamson Newbould | Charles Bailey William Williamson Newbould | 1839 | MANCH |
+ | Mentha pulegium | GB, Hampshire, River Erith | William Williamson Newbould | John Ray Hardy Susannah Mary Payne | 1841 | MANCH |
| Polygonum oxyspermum | GB, VC113 Channel Islands, Guernsey | William Williamson Newbould | Frederick Townsend | 1841 | SLBI |
| Carex canescens | GB, VC59 South Lancashire, White Moss | Leopold Hartley Grindon | William Williamson Newbould | 6/1841 | BM |
| Carex diandra | GB, VC90 Angus, Rescobie | Andrew Kerr | Botanical Society of Edinburgh William Williamson Newbould | 7/1841 | BM |
+ | Limonium binervosum subsp. sarniensis | GB, VC113 Channel Islands, Guernsey | William Williamson Newbould | Charles Bailey | 8/1841 | MANCH |
| Lotus subbiflorus | GB, VC113 Channel Islands, Guernsey, Saint Martin's | William Williamson Newbould | Frederick Townsend | 8/1841 | SLBI |
| Puccinellia distans | GB, VC13 West Sussex, Chichester | William Williamson Newbould | William Hillhouse | 1842 | BIRM |
+ | Teesdalia nudicaulis | GB, VC29 Cambridgeshire, Gamlingay | William Williamson Newbould | Charles Bailey John Ray Hardy | 3/4/1842 | MANCH |
| Scrophularia scorodonia | GB, VC113 Channel Islands, Jersey, Saint Peters | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 8/5/1842 | SLBI |
| Lythrum hyssopifolia | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 8/7/1842 | SLBI |
+ | Chamaemelum nobile | GB, VC113 Channel Islands, Jersey, Quennevais | William Williamson Newbould | I Hardy John Ray Hardy | 9/7/1842 | MANCH |
| Schoenoplectus pungens | GB, VC113 Channel Islands, Saint Ouen's Pond | William Williamson Newbould | Frederick Townsend | 8/1842 | SLBI |
| Oxalis corniculata | GB, VC113 Channel Islands, Jersey, Saint Peters | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 18/8/1842 | SLBI |
| Apium inundatum | GB, VC113 Channel Islands, Jersey, Noirmont Point | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 20/8/1842 | SLBI |
| Gnaphalium luteoalbum | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 22/8/1842 | SLBI |
+ | Scleranthus annuus | GB, VC113 Channel Islands, Sark | William Williamson Newbould | Charles Bailey | 24/8/1842 | MANCH |
| Armeria arenaria | GB, VC113 Channel Islands, Jersey, Quennevais | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 9/1842 | SLBI |
| Trifolium glomeratum | GB, VC113 Channel Islands, Saint Brelade's Bay | William Williamson Newbould | Croydon Natural History and Scientific Society Frederick Townsend | 2/9/1842 | SLBI |
| Carex chordorrhiza | GB, VC77,VC78,VC83, Pentland Hills | Nicholas Tyacke | John Thomas Irvine Boswell-Syme William Williamson Newbould | 1843 | BM |
| Carex flacca | GB, VC13 West Sussex, Mundham | William Williamson Newbould | | 1843 | E |