| Ornithogalum nutans | GB, VC37 Worcestershire, Hartlebury | Joseph Hesselgrave Thompson | William Hunt Painter | 4/1878 | ABS |
| Parapholis strigosa | GB, VC9 Dorset, Chesil Bank | Joseph Hesselgrave Thompson | William Hunt Painter | 20/8/1857 | ABS |
| Parietaria judaica | GB, VC41 Glamorganshire, Llandaff | Joseph Hesselgrave Thompson | Donor Unknown Martha Maria Atwood | 9/6/1853 | BIRM |
| Pastinaca sativa | GB, VC40 Shropshire, Highley | Joseph Hesselgrave Thompson | William Hunt Painter | 28/7/1881 | ABS |
| Petasites hybridus | GB, VC37 Worcestershire, Cradley | Joseph Hesselgrave Thompson | | 10/4/1884 | ABS |
| Pilosella aurantiaca | GB, VC37 Worcestershire, Tenbury | Joseph Hesselgrave Thompson | William Hunt Painter | 6/1878 | ABS |
| Pilosella aurantiaca | GB, VC37 Worcestershire, Tenbury | Joseph Hesselgrave Thompson | | 21/6/1878 | ABS |
| Poa compressa | GB, VC36 Herefordshire, Ledbury | Joseph Hesselgrave Thompson | William Hunt Painter | 21/7/1884 | ABS |
| Poa compressa subsp. polynoda | GB, VC37 Worcestershire, Bewdley | Joseph Hesselgrave Thompson | William Hunt Painter | 24/7/1882 | ABS |
| Poa nemoralis | GB, VC37 Worcestershire, Fenny Rough | Frederick Arnold Lees John Fraser Joseph Hesselgrave Thompson | William Hunt Painter | 2/6/1883 | ABS |
| Polygala calcarea | GB, VC22 Berkshire, Pangbourne | Joseph Hesselgrave Thompson | William Hunt Painter | 28/5/1881 | ABS |
| Polygala serpyllifolia | GB, VC38 Warwickshire, Sutton Park | Joseph Hesselgrave Thompson | | 16/6/1877 | ABS |
| Polygala serpyllifolia | GB, VC38 Warwickshire, Sutton Park | Joseph Hesselgrave Thompson | | 16/6/1877 | BIRM |
| Polygonum aviculare | GB, VC37 Worcestershire, Droitwich | Joseph Hesselgrave Thompson | Donor Unknown | 8/11/1852 | BIRM |
| Polypogon monspeliensis | GB, VC37 Worcestershire, Kidderminster | Joseph Hesselgrave Thompson | | 9/1875 | ABS |
| Polypogon monspeliensis | GB, VC37 Worcestershire, Kidderminster | Joseph Hesselgrave Thompson | | 4/9/1875 | ABS |
| Potamogeton compressus | GB, VC37 Worcestershire, Hartlebury Common | Joseph Hesselgrave Thompson | | 8/1871 | ABS |
| Potamogeton natans | GB, VC37 Worcestershire, Hartlebury | Joseph Hesselgrave Thompson | William Hunt Painter | 13/4/1848 | ABS |
| Potamogeton obtusifolius | GB, VC37 Worcestershire, Trimpley | Joseph Hesselgrave Thompson | | 9/8/1883 | ABS |
| Potentilla erecta | GB, VC40 Shropshire, Burford | Joseph Hesselgrave Thompson | William Hunt Painter | 6/1878 | ABS |
| Puccinellia distans | GB, VC37 Worcestershire, Droitwich | Joseph Hesselgrave Thompson | William Hunt Painter | 8/1850 | ABS |
| Pulicaria dysenterica | GB, VC37 Worcestershire, Hunnington | Joseph Hesselgrave Thompson | William Hunt Painter | 29/8/1884 | ABS |
| Ranunculus bulbosus | GB, VC113 Channel Islands, Piquer | Joseph Hesselgrave Thompson | William Hunt Painter | 5/1875 | ABS |
| Ranunculus fluitans | GB, VC40 Shropshire, Shrewsbury | Joseph Hesselgrave Thompson | | 6/1878 | ABS |
| Ranunculus parviflorus | GB, VC37 Worcestershire, Clent Hill | Joseph Hesselgrave Thompson | William Hunt Painter | 28/6/1883 | ABS |
| Rhynchospora alba | GB, VC37 Worcestershire, Hartlebury | Joseph Hesselgrave Thompson | | 9/1876 | ABS |
| Rhynchospora alba | GB, VC37 Worcestershire, Hartlebury Common | Joseph Hesselgrave Thompson | | 17/8/1863 | ABS |
| Ribes rubrum | GB, VC37 Worcestershire, Hartlebury | Joseph Hesselgrave Thompson | William Hunt Painter | 8/6/1877 | ABS |
| Ribes rubrum | GB, VC37 Worcestershire, Hartlebury | Joseph Hesselgrave Thompson | | 8/6/1877 | ABS |
| Ribes rubrum | GB, VC37 Worcestershire, Worcester | Joseph Hesselgrave Thompson | William Hunt Painter | 28/4/1851 | SHYB |
| Rosa spinosissima x mollis = R. x sabinii | GB, VC37 Worcestershire, Worcester | Joseph Hesselgrave Thompson | | 6/1878 | ABS |
| Rubus nemorosus | GB, VC37 Worcestershire, Hartlebury | Joseph Hesselgrave Thompson | | 23/7/1852 | ABS |
| Rubus nemorosus | GB, VC37 Worcestershire, Worcester | Joseph Hesselgrave Thompson | | 7/10/1857 | ABS |
| Rubus nemorosus | GB, VC39 Staffordshire, Kinver Edge | Joseph Hesselgrave Thompson | | 5/9/1878 | ABS |
| Rumex crispus x obtusifolius = R. x pratensis | GB, VC37 Worcestershire, Worcester | Joseph Hesselgrave Thompson | | 27/7/1853 | ABS |
| Sagina apetala | GB, VC37 Worcestershire, Kidderminster | Joseph Hesselgrave Thompson | William Hunt Painter | 2/6/1883 | ABS |
| Salix repens var. fusca | GB, VC17 Surrey, Farnham | Joseph Hesselgrave Thompson | Donor Unknown Martha Maria Atwood | 26/7/1849 | BIRM |
| Scirpus sylvaticus | GB, VC37 Worcestershire, Churchill | Joseph Hesselgrave Thompson | | 10/7/1877 | ABS |
| Sorbus domestica | GB, VC39 Staffordshire, Arley Castle | Joseph Hesselgrave Thompson | William Hunt Painter | 6/1878 | ABS |
| Sorbus domestica | GB, VC39 Staffordshire, Arley Castle | Joseph Hesselgrave Thompson | William Hunt Painter | 7/6/1878 | ABS |