| Ceratophyllum demersum | GB, VC38 Warwickshire, Sowe | Thomas Kirk | George Stephen West | 6/1849 | BIRM |
| Chenopodium polyspermum | GB, VC38 Warwickshire, Coventry | Thomas Kirk | George Stephen West | 10/1857 | BIRM |
| Chenopodium rubrum | | Thomas Kirk | George Stephen West | 7/1847 | BIRM |
| Helleborus viridis subsp. occidentalis | GB, VC38 Warwickshire, Studley | Thomas Kirk | George Stephen West Thomas Kirk | 5/1850 | BIRM |
| Juncus compressus | GB, VC62 North-east Yorkshire, Clifton Ings | Thomas Kirk | George Stephen West | 1861 | BIRM |
| Limosella aquatica | GB, VC38 Warwickshire, Arbury Hall | Thomas Kirk | George Stephen West | 7/1849 | BIRM |
| Myosotis discolor | GB, VC38 Warwickshire, Finham | Thomas Kirk | George Stephen West | 5/1850 | BIRM |
| Nepeta cataria | GB, VC38 Warwickshire, Whitley | | George Stephen West Thomas Kirk | 7/1847 | BIRM |
| Potamogeton compressus | GB, VC38 Warwickshire, Arbury Park | Thomas Kirk | George Stephen West | 6/1849 | BIRM |
| Potamogeton compressus | GB, VC38 Warwickshire, Arbury Park | Thomas Kirk | George Stephen West Thomas Kirk | 6/1849 | BIRM |
| Potamogeton densus | GB, VC32 Northamptonshire, River Nene at Muscott Mill | Thomas Kirk | George Stephen West | 8/1849 | BIRM |
| Potamogeton obtusifolius | GB, VC38 Warwickshire, Arbury Park | Thomas Kirk | George Stephen West | 6/1849 | BIRM |
| Sanguisorba minor subsp. muricata | GB, VC38 Warwickshire, Kenilworth | Thomas Kirk | George Stephen West | 26/6/1853 | BIRM |
| Sanguisorba minor subsp. muricata | GB, VC38 Warwickshire, Kenilworth | | George Stephen West Thomas Kirk | 7/1850 | BIRM |
+ | Equisetum hyemale x ramosissimum = E. x moorei | IE, VCH20 Co. Wicklow, Rockfield | Thomas Kirk | Hewett Cottrell Watson | 9/1858 | MANCH |
| Hieracium umbellatum | GB, VC38 Warwickshire, Binley | Thomas Kirk | Frederick Townsend | 7/1854 | SLBI |
| 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 gramineus | IE, VCH16 West Galway, Lough Corrib | Thomas Kirk | Allan Octavian Hume Frederick Townsend | 7/9/1853 | SLBI |
| Potamogeton coloratus x berchtoldii = P. x lanceolatus | GB, VC52 Anglesey, Bodafon | | Thomas Kirk | 9/1858 | E |
| Potamogeton coloratus x berchtoldii = P. x lanceolatus | GB, VC52 Anglesey, Lligwy | Thomas Kirk | | 9/1858 | E |
| 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 |
| 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 natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | | Thomas Kirk | 9/1838 | E |
| Potamogeton obtusifolius | GB, VC38 Warwickshire, Arbury Hall | Thomas Kirk | | 7/1854 | MANCH |
| Callitriche platycarpa | GB, VC38 Warwickshire, Stoke Heath | Thomas Kirk | George Stephen West Thomas Kirk | 6/1849 | BIRM |
| Carex rostrata | GB, VC38 Warwickshire, Whitmore Park | Thomas Kirk | Fleming Society John Sadler | 7/1855 | E |
| Salix fragilis x triandra = S. x alopecuroides | GB, VC38 Warwickshire, Quinton Pool | Thomas Kirk | IRGMA | 4/1849 10/1852 | LIV |
| Potamogeton coloratus x berchtoldii = P. x lanceolatus | GB, VC52 Anglesey, Bodafon | Thomas Kirk | G Smith William Hunt Painter | | ABS |
| Carex appropinquata | GB, VC64 Mid-west Yorkshire, Askham Bog | Patrick Neill Fraser | Thomas Kirk | | E |
| Carex diandra | GB, VC58 Cheshire, Seaman's Moss | G E Horne | Patrick Neill Fraser Thomas Kirk | | E |
| Carex divulsa | GB, VC23 Oxfordshire, Cumnor | | Patrick Neill Fraser Thomas Kirk | 7/1860 | E |
| Carex lasiocarpa | GB, VC67 South Northumberland, Barron House Bog | | Patrick Neill Fraser Thomas Kirk | 6/1853 | E |
| Carex muricata | GB, VC38 Warwickshire, Brandon | | Patrick Neill Fraser Thomas Kirk | 9/1839 | E |
| Carex muricata | GB, VC38 Warwickshire, Finham | Thomas Kirk | Patrick Neill Fraser Thomas Kirk | | E |
| Carex paniculata | GB, VC38 Warwickshire, Binley | | Patrick Neill Fraser Thomas Kirk | 7/1858 | E |
| Carex pseudocyperus | GB, VC38 Warwickshire, Stoke Aldmoor | Patrick Neill Fraser | Thomas Kirk | 8/1859 | E |
| Carex strigosa | GB, VC58 Cheshire, Cotterill Clough | George Edward Hunt | Patrick Neill Fraser Thomas Kirk | 7/1857 | E |