+ | Valerianella dentata | GB, VC38 Warwickshire, Warwick | Thomas Kirk | Samuel Octavus Gray | 8/1834 | MANCH |
+ | Valerianella dentata | GB, VC38 Warwickshire, Warwick | Thomas Kirk | Charles Bailey William Lowndes Notcutt | 8/1854 | MANCH |
+ | Torilis arvensis | GB, VC38 Warwickshire, Coventry | Thomas Kirk | John Hutton Balfour | | PTH |
+ | Tilia platyphyllos | | Thomas Kirk | John Hutton Balfour | 1862 | PTH |
+ | Thalictrum flavum | GB, VC38 Warwickshire, Warwickshire | John Gilbert Baker Thomas Kirk | | 1898 | BIRM |
| Sparganium natans | GB, VC37 Worcestershire, Asbury Hall | Thomas Kirk | Charles Ottley Groom | 7/1854 | BON |
+ | Silene gallica | GB, VC38 Warwickshire, Binley Common | Thomas Kirk | Charles Bailey John Harbord Lewis | 8/1860 | MANCH |
| Scheuchzeria palustris | GB, VC62 North-east Yorkshire, Thirsk | | Thomas Kirk | | E |
| Sanguisorba minor subsp. muricata | GB, VC38 Warwickshire, Kenilworth | John Gilbert Baker Thomas Kirk | George Stephen West | 7/1850 | 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 |
| Salix viminalis x cinerea = S. x holosericea | GB, VC38 Warwickshire, Pinley | Thomas Kirk | Charles Bailey | 4/1854 to 9/1854 | MANCH |
| Salix viminalis x cinerea = S. x holosericea | GB, VC38 Warwickshire, Wyken | Thomas Kirk | Charles Bailey William Lowndes Notcutt | 4/1854 9/1854 | MANCH |
| Salix viminalis x caprea = S. x smithiana | GB, VC38 Warwickshire, Pinley | Thomas Kirk | Donor Unknown | 4/1854 to 9/1854 | BIRM |
| Salix viminalis x caprea = S. x smithiana | GB, VC38 Warwickshire, Wyken | Thomas Kirk | IRGMA | 25/4/1853 19/9/1853 | LIV |
| Salix pentandra x fragilis = S. x meyeriana | GB, VC40 Shropshire, Shrewsbury Cultivated | Thomas Kirk | Augustin Ley | 6/1853 to 10/1853 | BIRM |
| Salix fragilis x triandra = S. x alopecuroides | GB, VC38 Warwickshire, Quinton Pool | Thomas Kirk | IRGMA | 4/1849 10/1852 | LIV |
| Salix fragilis x alba = S. x rubens | GB, VC38 Warwickshire, Brandon | Thomas Kirk | Donor Unknown | 4/1854 to 9/1854 | BIRM |
| Salix fragilis var. russelliana | GB, VC38 Warwickshire, Pinley | Thomas Kirk | Donor Unknown | 4/1854 to 9/1854 | BIRM |
| Salix cinerea subsp. oleifolia | GB, VC38 Warwickshire, Brownshill Green | Thomas Kirk | Donor Unknown | 4/1854 9/1854 | BIRM |
| Salix alba | GB, VC38 Warwickshire, Coventry | Thomas Kirk | Donor Unknown | 4/1854 9/1854 | BIRM |
+ | Rubus | GB, VC38 Warwickshire, Coventry | Thomas Kirk | John Hutton Balfour | 9/1834 | PTH |
| Potamogeton polygonifolius | GB, VC38 Warwickshire, Warwick | Thomas Kirk | | | BIRM |
| Potamogeton polygonifolius | IE, Galway, Shanagranagh | Thomas Kirk | Charles Bailey John Harbord Lewis | 9/1853 | MANCH |
| Potamogeton pectinatus | GB, VC38 Warwickshire, Stoke Heath | Thomas Kirk | Charles Bailey William Lowndes Notcutt | 5/1854 to 7/1854 | MANCH |
| Potamogeton pectinatus | GB, VC38 Warwickshire, Stoke Heath | John Gilbert Baker Thomas Kirk | George Stephen West | 5/1852 | BIRM |
| Potamogeton obtusifolius | GB, VC38 Warwickshire, Arbury Hall | Thomas Kirk | | 7/1854 | MANCH |
| Potamogeton obtusifolius | GB, VC38 Warwickshire, Arbury Park | Thomas Kirk | George Stephen West | 6/1849 | BIRM |
| Potamogeton obtusifolius | GB, VC38 Warwickshire, Kenilworth | Thomas Kirk | Charles Bailey | | MANCH |
| Potamogeton obtusifolius | GB, VC38 Warwickshire, Sowe Waste, Coventry | Thomas Kirk | Charles Bailey | 8/1858 | MANCH |
| 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 |
| 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 | 9/1858 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | | Thomas Kirk | 9/1838 | E |
| Potamogeton lucens | GB, VC38 Warwickshire, Sowe Waste, Coventry | Thomas Kirk | Charles Bailey John Harbord Lewis | 8/1858 | MANCH |