| Achillea ptarmica | GB, VC98 Argyllshire, Inveroran Hotel | Edward Shearburn Marshall | Charles Bailey Edward Shearburn Marshall | 1/8/1893 | MANCH |
| Aconitum napellus | GB, VC5 South Somerset, Dulverton | Edward Shearburn Marshall | | 2/6/1911 | SLBI |
| Aconitum napellus | GB, VC5 South Somerset, Ford | Edward Shearburn Marshall | | 2/6/1911 | MANCH |
+ | Agrostis gigantea | GB, VC88 Mid Perthshire, Lawers | Edward Shearburn Marshall | | 19/8/1887 | PTH |
| Agrostis scabra | GB, VC97 West Inverness-shire, Fersit | Edward Shearburn Marshall William Andrew Shoolbred | Botanical Exchange Club of The British Isles | 24/7/1896 | ABS |
| Agrostis scabra | GB, VC97 West Inverness-shire, Fersit | Edward Shearburn Marshall William Andrew Shoolbred | Botanical Exchange Club of The British Isles Augustin Ley | 24/7/1896 | BIRM |
| Agrostis stolonifera | GB, VC15 East Kent, Littlestone-on-Sea | Edward Shearburn Marshall | Augustin Ley | 10/7/1893 | BIRM |
| Agrostis stolonifera | GB, VC59 South Lancashire, Ainsdale | Charles Bailey | Botanical Exchange Club of The British Isles Charles Bailey Edward Hackel Edward Shearburn Marshall | 1/8/1892 to 20/8/1892 | ABS |
+ | Agrostis stolonifera | GB, VC88 Mid Perthshire, Crianlarich | Edward Shearburn Marshall | | 9/8/1893 | PTH |
| Agrostis stolonifera | GB, VC88 Mid Perthshire, Crianlarich | Edward Shearburn Marshall | Augustin Ley | 9/8/1893 | BIRM |
+ | Agrostis stolonifera | GB, VC88 Mid Perthshire, Loch Dochart | Edward Shearburn Marshall | | 27/7/1889 | PTH |
+ | Agrostis stolonifera | GB, VC89 East Perthshire, Beauly River flats ? | Edward Shearburn Marshall | | 4/8/1892 | PTH |
| Ajuga reptans | GB, VC17 Surrey, Alfold | Edward Shearburn Marshall | | 12/5/1894 | SLBI |
| Ajuga reptans | GB, VC17 Surrey, Alfold | Edward Shearburn Marshall | Frederick Townsend | 12/5/1894 | SLBI |
| Ajuga reptans | GB, VC17 Surrey, Witley | Edward Shearburn Marshall | Croydon Natural History and Scientific Society | 30/5/1889 | SLBI |
| Alisma lanceolatum | GB, VC5 South Somerset, Lilstock | Edward Shearburn Marshall | | 25/6/1914 | E |
| Alisma lanceolatum | GB, VC13 West Sussex, Birdham | Edward Shearburn Marshall | Edward Shearburn Marshall | 24/6/1901 | E |
| Alisma plantago-aquatica x ranunculoides | GB, VC52 Anglesey, Pentre Berw | Christian Maximilian Hugo Gluck | Edward Shearburn Marshall | 30/9/1912 | E |
| Allium ampeloprasum | GB, VC5 South Somerset, Minehead Warren Cultivated | Edward Shearburn Marshall | Botanical Exchange Club of The British Isles Augustin Ley Edward Shearburn Marshall | 10/8/1908 | BIRM |
| Allium ampeloprasum | GB, VC5 South Somerset, West Monkton Cultivated | Edward Shearburn Marshall | Arthur Bennett | 4/4/1907 2/5/1907 | SLBI |
| Allium scorodoprasum | GB, VC90 Angus, Restenat Priory | Edward Shearburn Marshall | Harold Stuart Thompson | 8/7/1915 | BIRM |
| Allium ursinum | GB, VC17 Surrey, Witley | Edward Shearburn Marshall | William Hadden Beeby | 21/5/1889 | SLBI |
| Allium ursinum | GB, VC17 Surrey, Witley | Edward Shearburn Marshall | Croydon Natural History and Scientific Society | 21/5/1889 | SLBI |
| Allium vineale | GB, VC3 South Devon, Newton Abbot GB, VC3 South Devon, Teignmouth | Edward Shearburn Marshall | Augustin Ley | 16/8/1909 | BIRM |
| Allium vineale | GB, VC3 South Devon, Teignmouth | Edward Shearburn Marshall | Augustin Ley | 16/8/1909 | BIRM |
| Althaea hirsuta | GB, VC6 North Somerset, Copley Wood | Edward Shearburn Marshall | Harold Stuart Thompson | 19/8/1915 | BIRM |
| Althaea hirsuta | GB, VC6 North Somerset, Kingsweston | Edward Shearburn Marshall | Croydon Natural History and Scientific Society Stafford Edwin Chandler Eric Frederic Drabble | 19/8/1915 | SLBI |
+ | Althaea hirsuta | GB, VC6 North Somerset, Kingweston | Edward Shearburn Marshall | Watson Botanical Exchange Club George Claridge Druce Mary Hayward | 19/8/1915 | MANCH |
| Amelanchier | GB, VC17 Surrey, Thursley | | Edward Shearburn Marshall | 14/5/1887 | SLBI |
| Anagallis arvensis | GB, VC17 Surrey, Worplesdon | Edward Shearburn Marshall | | 26/8/1889 | SLBI |
| Anagallis arvensis | GB, VC17 Surrey, Worplesdon | Edward Shearburn Marshall | Croydon Natural History and Scientific Society | 26/8/1899 | SLBI |
| Anagallis arvensis subsp. foemina | GB, VC6 North Somerset, Kingweston | Edward Shearburn Marshall | Watson Botanical Exchange Club Edward Shearburn Marshall William Robert Sherrin | 19/8/1915 | SLBI |
| Anchusa officinalis | GB, VC17 Surrey, Charleshill | Edward Shearburn Marshall | William Hadden Beeby | 24/6/1889 | SLBI |
| Anchusa officinalis | GB, VC17 Surrey, Tilford | Edward Shearburn Marshall | | 4/8/1888 | SLBI |
| Anchusa officinalis | GB, VC17 Surrey, Tilford | Edward Shearburn Marshall | | 4/8/1888 | SLBI |
| Andromeda polifolia | GB, VC63 South-west Yorkshire, Thorne Moor | Edward Shearburn Marshall | Job Edward Lousley | 1/8/1913 | SLBI |
| Anthoxanthum aristatum subsp. puelii | GB, VC3 South Devon, Bigbury | Edward Shearburn Marshall | Edward Shearburn Marshall Harold Stuart Thompson | 3/7/1894 | BIRM |
| Anthoxanthum aristatum subsp. puelii | GB, VC37 Worcestershire, Malvern | Charles Waterfall | Edward Shearburn Marshall Harold Stuart Thompson Watson Botanical Exchange Club Richard Francis Towndrow | 7/1898 | BIRM |
| Anthriscus caucalis | GB, VC106 East Ross & Cromarty, Balintore | Edward Shearburn Marshall | | 20/7/1892 | SLBI |
| Anthriscus cerefolium | GB, VC36 Herefordshire, Ross | Eleonora Armitage | Watson Botanical Exchange Club William Robert Sherrin Edward Shearburn Marshall | 12/6/1913 | SLBI |