| Astragalus danicus | GB, VC33 East Gloucestershire, Crickley Hill | Gustavus A Ornano St Brody | British Botanical Competition | 6/1864 | GLR |
| Astragalus glycyphyllos | GB, VC34 West Gloucestershire, Cleeve Wood | Gustavus A Ornano St Brody | Gustavus A Ornano St Brody | 6/1866 | GLR |
| Athyrium filix-femina | GB, VC33 East Gloucestershire, Cranham | Gustavus A Ornano St Brody | British Botanical Competition | 9/1864 | GLR |
| Athyrium filix-femina | GB, VC33 East Gloucestershire, Painswick | Gustavus A Ornano St Brody | | 7/1867 | GLR |
| Athyrium filix-femina | GB, VC34 West Gloucestershire, Forest of Dean | Gustavus A Ornano St Brody | British Botanical Competition | 8/1864 | GLR |
| Atriplex glabriuscula | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | | 7/1865 | GLR |
| Atriplex glabriuscula | GB, VC34 West Gloucestershire, New Passage | Gustavus A Ornano St Brody | | 7/1866 | GLR |
| Atriplex patula | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 9/1864 | GLR |
| Atriplex patula | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | | 7/1864 | GLR |
| Atriplex patula | GB, VC34 West Gloucestershire, New Passage | Gustavus A Ornano St Brody | | 7/1864 | GLR |
| Atriplex portulacoides | GB, VC34 West Gloucestershire, Shirehampton | Gustavus A Ornano St Brody | | 7/1867 | GLR |
| Atriplex prostrata | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 9/1864 | GLR |
| Atriplex prostrata | GB, VC34 West Gloucestershire, Lydney | Gustavus A Ornano St Brody | | 7/1865 | GLR |
| Ballota nigra var. ruderalis | GB, VC33 East Gloucestershire, Gloucester Docks | Gustavus A Ornano St Brody | George Stephen West John Harbord Lewis | 1870 | BIRM |
| Ballota nigra var. ruderalis | GB, VC33 East Gloucestershire, Gloucester Docks | Gustavus A Ornano St Brody | Augustin Ley | 1868 | BIRM |
| Ballota nigra var. ruderalis | GB, VC33 East Gloucestershire, Gloucester Docks | Gustavus A Ornano St Brody William Henry Purchas | Augustin Ley | 1868 | BIRM |
| Ballota ruderalis | GB, VC33 East Gloucestershire, Gloucester Docks | Gustavus A Ornano St Brody | Thomas Richard Archer Briggs | 1869 | K |
| Barbarea intermedia | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | | 6/1865 | GLR |
| Barbarea verna | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 5/1865 | GLR |
| Barbarea vulgaris | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 5/1864 | GLR |
| Barbarea vulgaris | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | | 6/1866 | GLR |
| Beta vulgaris subsp. maritima | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 9/1865 | GLR |
| Blechnum spicant | GB, VC33 East Gloucestershire, Cranham | Gustavus A Ornano St Brody | British Botanical Competition | 8/1864 | GLR |
| Bromus japonicus | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | Augustin Ley | 1868 | BIRM |
+ | Bromus secalinus | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | Charles Bailey | 1868 | MANCH |
| Bromus secalinus | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | Augustin Ley | 1868 | BIRM |
| Buxus sempervirens | GB, VC34 West Gloucestershire, Wotton Hill | Gustavus A Ornano St Brody | British Botanical Competition | 5/1863 | GLR |
| Cakile maritima | GB, VC34 West Gloucestershire, Beachley | Gustavus A Ornano St Brody | | 6/1863 | GLR |
+ | Calamintha arvensis | GB, Kent, Kent,Borstal | Gustavus A Ornano St Brody | Charles Bailey | 7/1891 | MANCH |
| Caltha palustris var. guerangerii | GB, VC16 West Kent, Snodland | Gustavus A Ornano St Brody | Charles Bailey | 9/1891 | MANCH |
| Caltha palustris var. guerangerii | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 5/1864 | GLR |
| Camelina microcarpa | GB, VC33 East Gloucestershire, Gloucester Docks | Gustavus A Ornano St Brody | | 7/1868 | GLR |
| Camelina sativa | GB, VC33 East Gloucestershire, Gloucester Docks | Gustavus A Ornano St Brody | | 7/1867 | GLR |
| Camelina sativa | GB, VC33 East Gloucestershire, Gloucester Docks | Gustavus A Ornano St Brody | | 7/1868 | GLR |
| Campanula latifolia | GB, VC65 North-west Yorkshire, Richmond | Gustavus A Ornano St Brody | Charles Bailey Eyre Champion de Crespigny | 1877 | MANCH |
| Campanula trachelium | GB, VC15 East Kent, Borstal | Gustavus A Ornano St Brody | Charles Bailey | 7/1891 | MANCH |
| Capsella bursa-pastoris | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | | 6/1864 | GLR |
| Cardamine amara | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 6/1864 | GLR |
| Cardamine amara | GB, VC34 West Gloucestershire, Berkeley | Gustavus A Ornano St Brody | British Botanical Competition | 5/1864 | GLR |
| Cardamine flexuosa | GB, VC34 West Gloucestershire, Newent | Gustavus A Ornano St Brody | | 6/1866 | GLR |