| Potamogeton polygonifolius | GB, VC89 East Perthshire, Glenshee | Thomas Barker | Thomas Barker | 7/1879 | MANCH |
| Caltha palustris var. guerangerii | GB, VC97 West Inverness-shire, Laggan | | Thomas Barker | 7/1879 | MANCH |
+ | Cerastium alpinum | GB, VC97 West Inverness-shire, Laggan,Coire [Corrie] Ardair | Thomas Barker | | 7/1879 | MANCH |
+ | Hymenophyllum wilsonii | GB, VC48 Merionethshire, Dolgellau, Torrent Walk | | Thomas Barker | 4/1879 | MANCH |
+ | Minuartia verna | GB, VC57 Derbyshire, Monsal Dale | Thomas Barker | | 8/1878 | MANCH |
| Alisma plantago-aquatica | GB, VC58 Cheshire, Cheadle | Thomas Barker | | 8/1878 | MANCH |
| Rorippa nasturtium-aquaticum | GB, VC57 Derbyshire, Buxton | Thomas Barker | | 7/1878 | MANCH |
| Rorippa nasturtium-aquaticum | GB, VC57 Derbyshire, Buxton | Thomas Barker | | 7/1878 | MANCH |
+ | Silene nutans | GB, VC57 Derbyshire, Buxton | Thomas Barker | | 7/1878 | MANCH |
| Potamogeton crispus | GB, VC57 Derbyshire, River Dove | | Thomas Barker | 7/1878 | MANCH |
| Campanula latifolia | GB, VC58 Cheshire, Burton | Thomas Barker | Thomas Barker | 7/1878 | MANCH |
| Oxalis acetosella | GB, VC70 Cumberland, Lake District National Park | | Thomas Barker | 4/1878 | MANCH |
| Festuca pratensis x Lolium perenne = x Festulolium loliaceum | GB, VC58 Cheshire, Burton | Thomas Barker | | 1878 | BON |
| Ranunculus acris | GB, VC59 South Lancashire, Withington | Thomas Barker | Manchester Museum (Owens College) | 6/1877 | MANCH |
| Oxalis acetosella | GB, Wales | | Thomas Barker | 4/1876 | MANCH |
+ | Woodsia ilvensis | GB, VC69 Westmorland, Ambleside | | Thomas Barker | 7/10/1875 | MANCH |
| Serratula tinctoria | GB, VC42 Breconshire, Pont-nedd-Fychan | | Thomas Barker | 9/1875 | MANCH |
| Anaphalis margaritacea | GB, VC42 Breconshire, Pontneddfechan | Thomas Barker | Thomas Barker | 9/1875 | MANCH |
| Serratula tinctoria | GB, VC42 Breconshire, Pontneddfechan | Thomas Barker | Thomas Barker | 9/1875 | MANCH |
| Campanula latifolia | GB, VC43 Radnorshire, New Radnor | | Thomas Barker | 9/1875 | MANCH |
| Clematis vitalba | GB, VC35 Monmouthshire | Augustin Ley | Thomas Barker | 8/1875 | MANCH |
+ | Wahlenbergia hederacea | GB, VC48 Merionethshire, Dolgellau | Thomas Barker | | 8/1875 | MANCH |
+ | Hymenophyllum wilsonii | GB, VC69 Westmorland, Lake District | Thomas Barker | Thomas Barker | 7/1875 to 8/1875 | MANCH |
+ | Euphrasia anglica | GB, VC11 South Hampshire | Thomas Barker | | 1875 | MANCH |
| Campanula latifolia | GB, VC69 Westmorland, Ambleside | | Thomas Barker | 1875 | MANCH |
+ | Sagina nivalis | GB, VC88 Mid Perthshire, Ben Lawers | Henry Maurice Drummond-Hay | Thomas Barker | 7/1874 | MANCH |
+ | Wahlenbergia hederacea | GB, VC3 South Devon, Okehampton | Thomas Barker | | 9/1873 | MANCH |
+ | Wahlenbergia hederacea | GB, VC3 South Devon, Okehampton | Thomas Barker | | 9/1873 | MANCH |
+ | Saxifraga hypnoides | GB, VC57 Derbyshire, Buxton | Thomas Barker | Botanical Society of London Charles Bailey John Ray Hardy Thomas Barker | 23/7/1873 | MANCH |
+ | Wahlenbergia hederacea | GB, VC3 South Devon, Okehampton | Thomas Barker | | 1873 | MANCH |
| Arbutus alpina | GB, VC106 East Ross & Cromarty, Ben Wyvis | Thomas Barker | William Hadden Beeby John Roy | 8/1872 | SLBI |
+ | Hymenophyllum wilsonii | GB, Ross & Cromarty, Ross,Ross-shire | | Thomas Barker | 7/1872 | MANCH |
| Carex pallescens | GB, VC88 Mid Perthshire, Lochay | H S | Thomas Barker | 7/1871 | MANCH |
+ | Habenaria viride | GB, VC88 Mid Perthshire, Lawers | Thomas Barker | | 1871 | MANCH |
+ | Hymenophyllum wilsonii | GB, VC69 Westmorland, Lake District | | Thomas Barker | 8/1870 | MANCH |
+ | Habenaria albida | GB, VC91 Kincardineshire, Strachan | Ray J Sim Thomas Barker | Charles Bailey | 7/1869 | MANCH |
| Salix lanata | GB, VC92 South Aberdeenshire, Glen Callater | John Roy Thomas Barker | Croydon Natural History and Scientific Society Henry Franklin Parsons | 7/1869 | SLBI |
+ | Eriocaulon aquaticum | IE, VCH16 West Galway, Connemara | | Thomas Barker | 8/1868 | MANCH |
| Potamogeton lucens x gramineus = P. x angustifolius | IE, VCH16 West Galway, Maam | Thomas Barker | | 8/1868 | MANCH |
| Saxifraga umbrosa x spathularis = S. x urbium | IE, Mayo, Croagh Patrick | Thomas Barker | Thomas Barker | 8/1868 | MANCH |