| Erica mackaiana | IE, VCH16 West Galway, Roundstone | William Williamson Newbould | | 5/1880 | SLBI |
+ | Scleranthus annuus | GB, VC113 Channel Islands, Sark | William Williamson Newbould | Charles Bailey | 24/8/1842 | MANCH |
| Limonium vulgare | GB, VC113 Channel Islands, Saint Sampson's, Guernsey | William Williamson Newbould | | 1/9/1835 | SLBI |
| Schoenoplectus pungens | GB, VC113 Channel Islands, Saint Ouen's Pond | William Williamson Newbould | Frederick Townsend | 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 |
| 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 |
| Ludwigia palustris | GB, VC113 Channel Islands, Jersey, Saint Peters | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 1846 | SLBI |
| Oxalis corniculata | GB, VC113 Channel Islands, Jersey, Saint Peters | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 18/8/1842 | SLBI |
| Scrophularia scorodonia | GB, VC113 Channel Islands, Jersey, Saint Peters | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 8/5/1842 | SLBI |
| Achillea maritima | GB, VC113 Channel Islands, Jersey, Saint Ouen's | William Williamson Newbould | Frederick Townsend | 9/7/1862 | SLBI |
| Lythrum hyssopifolia | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 8/7/1842 | SLBI |
| Armeria arenaria | GB, VC113 Channel Islands, Jersey, Quennevais | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 9/1842 | SLBI |
+ | Chamaemelum nobile | GB, VC113 Channel Islands, Jersey, Quennevais | William Williamson Newbould | I Hardy John Ray Hardy | 9/7/1842 | MANCH |
| Apium inundatum | GB, VC113 Channel Islands, Jersey, Noirmont Point | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 20/8/1842 | SLBI |
| Lotus subbiflorus | GB, VC113 Channel Islands, Guernsey, Saint Martin's | William Williamson Newbould | Frederick Townsend | 8/1841 | SLBI |
+ | Limonium binervosum subsp. sarniensis | GB, VC113 Channel Islands, Guernsey | William Williamson Newbould | Charles Bailey | 8/1841 | MANCH |
| Polygonum oxyspermum | GB, VC113 Channel Islands, Guernsey | William Williamson Newbould | Frederick Townsend | 1841 | SLBI |
| Carex maritima | GB, VC108 West Sutherland, Polin | | William Williamson Newbould | | BM |
| Carex lasiocarpa | GB, VC108 West Sutherland, Glen Canish | | John Thomas Irvine Boswell-Syme Nicholas Tyacke William Williamson Newbould Frederick Janson Hanbury | | BM |
| Eriophorum latifolium | GB, VC97 West Inverness-shire, Arisaig | Nicholas Tyacke William Williamson Newbould | Frederick Townsend | | SLBI |
| Carex diandra | GB, VC90 Angus, Rescobie | Andrew Kerr | Botanical Society of Edinburgh William Williamson Newbould | 7/1841 | BM |
+ | Lychnis alpina | GB, VC90 Angus, Little Kilrannoch [Little Gilrannoch] | James MacNab William Williamson Newbould | Charles Bailey James MacNab John Harbord Lewis | 7/1832 | MANCH |
+ | Linnaea borealis | GB, VC90 Angus, Clova,Glen Doll | | Isaac Bayley Balfour William Williamson Newbould | 1857 | MANCH |
+ | Oxytropis campestris | GB, VC90 Angus, Clova,Glen Doll | | Charles Bailey William Williamson Newbould | 8/9/1830 | MANCH |
| Hieracium strictiforme | GB, Mid-West Perthshire, Glen Falloch | Charles Cardale Babington William Williamson Newbould | Frederick Townsend | 5/8/1846 | SLBI |
+ | Lychnis viscaria | GB, VC89 East Perthshire, Den of Balthayock | William Williamson Newbould | John Ray Hardy | 7/1849 | MANCH |
| Hammarbya paludosa | GB, VC87 West Perthshire, Inverarnan | William Williamson Newbould | Allan Octavian Hume Frederick Townsend | 8/4/1846 | SLBI |
| Carex chordorrhiza | GB, VC77,VC78,VC83, Pentland Hills | Nicholas Tyacke | John Thomas Irvine Boswell-Syme William Williamson Newbould | 1843 | BM |
+ | Astragalus danicus | GB, VC83 Midlothian, Edinburgh,Arthur's Seat | | Charles Bailey Henry Alexander Hurst William Williamson Newbould | 5/1830 | MANCH |
+ | Lychnis viscaria | GB, VC83 Midlothian, Edinburgh,Arthur's Seat | William Williamson Newbould | Charles Bailey John Ray Hardy William Williamson Newbould | 5/1850 | MANCH |
| Rubus latifolius | GB, VC83 Midlothian, Edinburgh | William Williamson Newbould | | 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 |
| Centaurea nigra | GB, VC61,VC62,VC64, York | William Williamson Newbould | Frederick Townsend William Williamson Newbould | 1/7/1846 | SLBI |
| Fumaria muralis | GB, VC63 South-west Yorkshire, Sheffield | William Williamson Newbould | Charles Cardale Babington George Stephen West | 29/7/1859 | BIRM |
+ | Genista anglica | GB, VC63 South-west Yorkshire, Sheffield | William Williamson Newbould | Charles Bailey William Williamson Newbould | 1839 | MANCH |
| Lamium maculatum | GB, VC63 South-west Yorkshire, Sheffield | William Williamson Newbould | Frederick Townsend | 18/7/1846 | SLBI |
| Potamogeton polygonifolius | GB, VC63 South-west Yorkshire, Sheffield | William Williamson Newbould | Charles Bailey William Williamson Newbould | | MANCH |
| Potamogeton polygonifolius | GB, VC63 South-west Yorkshire, Loxley | William Williamson Newbould | William Hadden Beeby | 7/6/1846 | SLBI |
| Potamogeton polygonifolius | GB, VC63 South-west Yorkshire, Longley | William Williamson Newbould | John Ray Hardy | 7/6/1846 | MANCH |