| Agrostemma githago | GB, VC34 West Gloucestershire, Over | Gustavus A Ornano St Brody | | 8/1864 | GLR |
| Alchemilla vulgaris agg | GB, VC33 East Gloucestershire, Cranham | Gustavus A Ornano St Brody | British Botanical Competition | 4/1864 | GLR |
| Alchemilla vulgaris agg | GB, VC33 East Gloucestershire, Glenfall | Gustavus A Ornano St Brody | British Botanical Competition | 5/1864 | GLR |
| Alchemilla vulgaris agg | GB, VC33 East Gloucestershire, Whitcomb | Gustavus A Ornano St Brody | British Botanical Competition | 4/1864 | GLR |
| Alliaria petiolata | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 6/1864 | GLR |
| Althaea officinalis | GB, VC34 West Gloucestershire, New Passage | Gustavus A Ornano St Brody | | 8/1866 | GLR |
| Alyssum alyssoides | GB, VC33 East Gloucestershire, Gloucester Docks | Gustavus A Ornano St Brody | | 7/1868 | GLR |
| Alyssum alyssoides | GB, VC33 East Gloucestershire, Stonehouse | Gustavus A Ornano St Brody | | 5/1865 | GLR |
| Amaranthus retroflexus | GB, VC33 East Gloucestershire, Tuffley | Gustavus A Ornano St Brody | | 6/1865 | GLR |
| Anemone apennina | GB, VC33 East Gloucestershire, Whitcomb | Gustavus A Ornano St Brody | British Botanical Competition | 6/1864 | GLR |
| Anemone nemorosa | GB, VC33 East Gloucestershire, Witcombe Wood | Gustavus A Ornano St Brody | British Botanical Competition | 5/1864 | GLR |
| Anemone ranunculoides | GB, VC33 East Gloucestershire, Haresfield | Gustavus A Ornano St Brody | | 6/1868 | GLR |
| Anthyllis vulneraria | GB, VC33 East Gloucestershire, Painswick Hill | Gustavus A Ornano St Brody | British Botanical Competition | 6/1864 | GLR |
| Aphanes arvensis | GB, VC33 East Gloucestershire, Prestbury | Gustavus A Ornano St Brody | British Botanical Competition | 8/1864 | GLR |
| Arabidopsis thaliana | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 6/1864 | GLR |
| Arabis glabra | GB, VC34 West Gloucestershire, Saint Vincent's Rocks | Gustavus A Ornano St Brody | | 1854 | GLR |
| Arabis hirsuta | GB, VC33 East Gloucestershire, Leckhampton | Gustavus A Ornano St Brody | British Botanical Competition | 6/1864 | GLR |
| Arabis hirsuta | GB, VC34 West Gloucestershire, Frampton | Gustavus A Ornano St Brody | | 5/1865 | GLR |
| Arabis scabra | GB, VC34 West Gloucestershire, Saint Vincent's Rocks | Gustavus A Ornano St Brody | | 5/1864 | GLR |
| Arenaria serpyllifolia | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 8/1864 | GLR |
| Arenaria serpyllifolia subsp. leptoclados | GB, VC33 East Gloucestershire, Frith Wood | Gustavus A Ornano St Brody | | 8/1863 | GLR |
| Armoracia rusticana | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 9/1865 | GLR |
| Asplenium adiantum-nigrum | GB, VC34 West Gloucestershire, Lancaut | Gustavus A Ornano St Brody | Gustavus A Ornano St Brody | 9/1864 | GLR |
| Asplenium marinum | GB, VC34 West Gloucestershire, Shirehampton | Gustavus A Ornano St Brody | | 1856 | GLR |
| Asplenium obovatum | GB, VC34 West Gloucestershire, Oldbury | Gustavus A Ornano St Brody | | 7/1869 | GLR |
| Asplenium ruta-muraria | GB, VC33 East Gloucestershire, Gloucester | Gustavus A Ornano St Brody | British Botanical Competition | 9/1864 | GLR |
| Asplenium trichomanes | GB, VC34 West Gloucestershire, Lancaut | Gustavus A Ornano St Brody | | 9/1864 | GLR |
| 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 |