| Carex panicea | GB, VC46 Cardiganshire, Cardigan | Andrew David Quentin Agnew | | 29/5/1999 | ABS |
| Carex panicea | GB, VC46 Cardiganshire, Llyn Eiddwen Reserve | Andrew David Quentin Agnew | | 9/7/1998 | ABS |
| Carex panicea | GB, VC46 Cardiganshire, Rhos Glyn yr Helyg | Andrew David Quentin Agnew | | 22/5/1999 | ABS |
| Carex pilulifera | GB, VC46 Cardiganshire, Rhos Glyn yr Helyg | Andrew David Quentin Agnew | | 21/5/1989 | ABS |
| Carex pilulifera | GB, VC46 Cardiganshire, allt ty cam | Andrew David Quentin Agnew | | 2/7/1999 | ABS |
| Carex pulicaris | GB, VC46 Cardiganshire, Llyn Eiddwen | Andrew David Quentin Agnew | | 9/7/1998 | ABS |
| Carex viridula subsp. brachyrrhyncha | GB, VC88 Mid Perthshire, Lochan na Lairige | Andrew David Quentin Agnew | | 20/9/1983 | ABS |
| Carex viridula subsp. oedocarpa | GB, VC46 Cardiganshire, Rhos Pil Bach | Andrew David Quentin Agnew | | 29/5/1999 | ABS |
| Carex viridula subsp. oedocarpa | GB, VC46 Cardiganshire, Llangwyryfon | Andrew David Quentin Agnew | | 9/7/1997 | ABS |
| Carex viridula subsp. viridula | GB, VC46 Cardiganshire, Ynyslas | Andrew David Quentin Agnew | | 15/7/1975 | ABS |
| Catapodium marinum | GB, VC46 Cardiganshire, Cardigan Island | Andrew David Quentin Agnew | | 3/7/1999 | ABS |
| Centaurium erythraea | GB, VC46 Cardiganshire, Penderi Cliffs | Andrew David Quentin Agnew | | 5/7/1998 | ABS |
| Centaurium erythraea | GB, VC46 Cardiganshire, Ynyslas | Andrew David Quentin Agnew | | 6/8/1975 | ABS |
| Cerastium diffusum | GB, VC46 Cardiganshire, Borth | Andrew David Quentin Agnew | | 9/5/1975 | ABS |
| Cerastium fontanum | GB, VC46 Cardiganshire, Borth | Andrew David Quentin Agnew | | 9/5/1975 | ABS |
| Cerastium fontanum | GB, VC46 Cardiganshire, Penderi Cliffs | Andrew David Quentin Agnew | | 5/7/1998 | ABS |
| Cerastium glomeratum | GB, VC46 Cardiganshire, Rhos glandenys | Andrew David Quentin Agnew | | 1/6/1999 | ABS |
| Cerastium glomeratum | GB, VC45 Pembrokeshire, Saint Justinians | Andrew David Quentin Agnew | | 2/6/1975 | ABS |
| Cerastium glomeratum | GB, VC46 Cardiganshire, Borth | Andrew David Quentin Agnew | | 9/5/1975 | ABS |
| Cerastium semidecandrum | GB, VC46 Cardiganshire, Ynyslas | Andrew David Quentin Agnew | | 9/5/1975 | ABS |
| Ceratocapnos claviculata | GB, VC46 Cardiganshire, Penderi Cliffs | Andrew David Quentin Agnew | | 3/7/1996 | ABS |
| Chaenorhinum minus | GB, VC46 Cardiganshire, Aberystwyth | Andrew David Quentin Agnew | | 8/1975 | ABS |
| Chamerion angustifolium | GB, VC46 Cardiganshire, Capel Bangor | Andrew David Quentin Agnew Shirley Agnew | | 26/7/1996 | ABS |
| Chrysosplenium oppositifolium | GB, VC46 Cardiganshire, Goginan, Allt Ty Cam | Andrew David Quentin Agnew Shirley Agnew | | 31/3/1997 | ABS |
| Cichorium intybus | GB, VC46 Cardiganshire, Dol y Bont | Andrew David Quentin Agnew | | 1/8/1975 | ABS |
| Cirsium palustre | GB, VC46 Cardiganshire, Llyn Eiddwen Reserve | Andrew David Quentin Agnew Shirley Agnew | | 2/8/1996 | ABS |
| Claytonia sibirica | GB, VC46 Cardiganshire, Gors Goch | Andrew David Quentin Agnew | | 22/5/1999 | ABS |
| Cochlearia danica | GB, VC46 Cardiganshire, Penderi Cliffs | Andrew David Quentin Agnew | | 3/7/1996 | ABS |
| Cochlearia danica | GB, VC46 Cardiganshire, Penderi Cliffs | Andrew David Quentin Agnew | | 3/4/1997 | ABS |
| Conopodium majus | GB, VC46 Cardiganshire, Allt Pencnwc | Andrew David Quentin Agnew | | 22/5/1999 | ABS |
| Convolvulus arvensis | GB, VC46 Cardiganshire, Aberystwyth | Andrew David Quentin Agnew | | 5/7/1975 | ABS |
| Cytisus scoparius | GB, VC46 Cardiganshire, Grogwynion | Andrew David Quentin Agnew | | 11/6/1999 | ABS |
| Dactylis glomerata | GB, VC46 Cardiganshire, Llanrhystyd | Andrew David Quentin Agnew | | 3/7/1996 | ABS |
| Dactylis glomerata | GB, VC46 Cardiganshire, allt ty cam | Andrew David Quentin Agnew Shirley Agnew | | 26/7/1996 | ABS |
| Dactylorhiza fuchsii | GB, VC46 Cardiganshire, Borth | Andrew David Quentin Agnew | | 26/5/1975 | ABS |
| Danthonia decumbens | GB, VC46 Cardiganshire, Penderi Cliffs | Andrew David Quentin Agnew | | 5/7/1998 | ABS |
| Deschampsia cespitosa | GB, VC46 Cardiganshire, allt ty cam | Andrew David Quentin Agnew Shirley Agnew | | 26/7/1996 | ABS |
| Deschampsia flexuosa | GB, VC46 Cardiganshire, Pendam reservoir | Andrew David Quentin Agnew | | 24/6/1976 | ABS |
| Digitalis purpurea | GB, VC46 Cardiganshire, Penderi Cliffs | Andrew David Quentin Agnew | | 3/7/1996 | ABS |
| Diplotaxis muralis | GB, VC46 Cardiganshire, Aberystwyth | Andrew David Quentin Agnew | | 7/8/1975 | ABS |