+ | Tilia platyphyllos | | Thomas Kirk | John Hutton Balfour | 1862 | PTH |
+ | Equisetum hyemale x ramosissimum = E. x moorei | IE, VCH20 Co. Wicklow, Rockfield | Thomas Kirk | Charles Bailey | 9/1838 | MANCH |
+ | Equisetum hyemale x ramosissimum = E. x moorei | IE, VCH20 Co. Wicklow, Rockfield | Thomas Kirk | Hewett Cottrell Watson | 9/1858 | MANCH |
| Potamogeton polygonifolius | IE, Galway, Shanagranagh | Thomas Kirk | Charles Bailey John Harbord Lewis | 9/1853 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | | Thomas Kirk | 9/1858 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | | Thomas Kirk | 9/1838 | E |
| Potamogeton gramineus | IE, VCH16 West Galway, Lough Corrib | Thomas Kirk | Allan Octavian Hume Frederick Townsend | 7/9/1853 | SLBI |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Lough Corrib | | Thomas Kirk | 9/1858 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Lough Corrib | | Thomas Kirk | 9/1858 | E |
| Potamogeton gramineus | IE, VCH16,VCH17, Lough Corrib IE, VCH18 Offaly, Oughter | | Thomas Kirk | 8/1858 | E |
| Potamogeton gramineus | IE, VCH16,VCH17, Lough Corrib | Thomas Kirk | Allan Octavian Hume Frederick Townsend | 7/9/1853 | SLBI |
| Potamogeton gramineus | IE, VCH16,VCH26, Lough Corrib | Thomas Kirk | Allan Octavian Hume Frederick Townsend | 7/9/1853 | SLBI |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | Thomas Kirk | Botanical Exchange Club of the Thirsk Natural History Society Mantua And Montferrat | | BON |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | Thomas Kirk | Botanical Exchange Club of the Thirsk Natural History Society Charles Bailey John Ray Hardy | 9/1858 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | Thomas Kirk | Charles Bailey | 7/9/1853 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | Thomas Kirk | | 7/9/1853 | MANCH |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16,VCH17, Lough Corrib | Thomas Kirk | | 7/9/1853 | E |
| Camelina sativa | IE, VCH16,VCH17, Galway | Thomas Kirk | Augustin Ley | 5/9/1853 | BIRM |
| Potamogeton filiformis | GB, Ambiguous locality (GB), Longford | Thomas Kirk | | 16/8/1853 | SLBI |
| Potamogeton filiformis | GB, Ambiguous locality (GB), Longford | Thomas Kirk | | | SLBI |
| Carex lasiocarpa | GB, VC67 South Northumberland, Barron House Bog | | Patrick Neill Fraser Thomas Kirk | 6/1853 | E |
| Carex appropinquata | GB, VC64 Mid-west Yorkshire, Askham Bog | Patrick Neill Fraser | Thomas Kirk | | E |
| Scheuchzeria palustris | GB, VC62 North-east Yorkshire, Thirsk | | Thomas Kirk | | E |
| Juncus compressus | GB, VC62 North-east Yorkshire, Clifton Ings | Thomas Kirk | George Stephen West | 1861 | BIRM |
| Carex diandra | GB, VC58 Cheshire, Seaman's Moss | G E Horne | Patrick Neill Fraser Thomas Kirk | | E |
| Carex strigosa | GB, VC58 Cheshire, Cotterill Clough | George Edward Hunt | Patrick Neill Fraser Thomas Kirk | 7/1857 | E |
| Potamogeton coloratus x berchtoldii = P. x lanceolatus | GB, VC52 Anglesey, Lligwy | Thomas Kirk | | 9/1858 | E |
| Potamogeton coloratus x berchtoldii = P. x lanceolatus | GB, VC52 Anglesey, Bodafon | Thomas Kirk | Botanical Exchange Club of the Thirsk Natural History Society Charles Bailey John Ray Hardy | 9/1858 | MANCH |
| Potamogeton coloratus x berchtoldii = P. x lanceolatus | GB, VC52 Anglesey, Bodafon | Thomas Kirk | Thirsk Natural History Society Mantua And Montferrat | 9/1858 | BON |
| Potamogeton coloratus x berchtoldii = P. x lanceolatus | GB, VC52 Anglesey, Bodafon | Thomas Kirk | G Smith William Hunt Painter | | ABS |
| Potamogeton coloratus x berchtoldii = P. x lanceolatus | GB, VC52 Anglesey, Bodafon | | Thomas Kirk | 9/1858 | E |
| Calluna vulgaris | GB, VC49 Caernarvonshire, Bwlch yr Haiarn | Thomas Kirk | Augustin Ley | 9/1849 | BIRM |
| Salix pentandra x fragilis = S. x meyeriana | GB, VC40 Shropshire, Shrewsbury Cultivated | Thomas Kirk | Augustin Ley | 6/1853 to 10/1853 | BIRM |
+ | Campanula rapunculus | GB, VC39 Staffordshire | Thomas Kirk | Botanical Exchange Club Charles Bailey John (Joannis) Fraser | 7/1879 | MANCH |
| Carex flacca | GB, VC38 Warwickshire, Wyken | Thomas Kirk | Charles Ottley Groom | 31/5/1854 to 7/1855 | BON |
| Salix viminalis x caprea = S. x smithiana | GB, VC38 Warwickshire, Wyken | Thomas Kirk | IRGMA | 25/4/1853 19/9/1853 | LIV |
| Salix viminalis x cinerea = S. x holosericea | GB, VC38 Warwickshire, Wyken | Thomas Kirk | Charles Bailey William Lowndes Notcutt | 4/1854 9/1854 | MANCH |
| Carex rostrata | GB, VC38 Warwickshire, Whitmore Park | Thomas Kirk | Fleming Society John Sadler | 7/1855 | E |
| Nepeta cataria | GB, VC38 Warwickshire, Whitley | | George Stephen West Thomas Kirk | 7/1847 | BIRM |
| Epipactis helleborine | GB, VC38 Warwickshire, Weston under Wetherley | Thomas Kirk | Charles Bailey William Lowndes Notcutt | 8/1854 | MANCH |