| Adonis autumnalis | GB, VC16 West Kent, Swanley | | Frederick Janson Hanbury | 6/8/1883 | ABS |
| Agropyron donianum | GB, VC21 Middlesex, Clapton Park Cultivated GB, VC88 Mid Perthshire, Ben Lawers | Frederick Janson Hanbury | | 1888 | BON |
+ | Agrostemma githago | GB, VC10 Isle of Wight, Cornfield, Sandown, Isle of Wight | Frederick Janson Hanbury | | 19/7/1920 | BM |
+ | Agrostemma githago | GB, VC10 Isle of Wight, Nr Yarnmouth" Isle of Wight | Frederick Janson Hanbury | | 15/9/1893 | BM |
+ | Ajuga chamaepitys | GB, VC17 Surrey, Mickleham,Headley Lane | | Frederick Janson Hanbury | 13/7/1872 | MANCH |
| Anisantha diandra | GB, VC113 Channel Islands, Jersey | Frederick Janson Hanbury | Frederick Janson Hanbury | 6/1884 | ABS |
| Arabis petraea | GB, VC92 South Aberdeenshire, Luibeg | Frederick Janson Hanbury | William Hadden Beeby | 8/1887 | SLBI |
| Arabis petraea | GB, VC92 South Aberdeenshire, Luibeg | Frederick Janson Hanbury | Frederick Janson Hanbury William Hadden Beeby | 8/1887 | SLBI |
| Arbutus alpina | GB, VC108 West Sutherland, Durness | | Frederick Janson Hanbury William Hadden Beeby Arthur Bennett | 13/7/1885 | SLBI |
| Arctium lappa x minus = A. x nothum | DK, Copenhagen Cultivated | Frederick Janson Hanbury | | 7/1872 | BIRM |
| Arenaria ciliata | IE, VCH28 Co. Sligo, Benbulben | Frederick Janson Hanbury | Frederick Janson Hanbury William Hunt Painter | 12/7/1891 | ABS |
| Arenaria ciliata | IE, VCH28 Co. Sligo, Benbulben | Frederick Janson Hanbury | Frederick Janson Hanbury William Hadden Beeby | 12/7/1891 | SLBI |
| Arenaria ciliata | IE, VCH28 Co. Sligo, Benbulbin Range | Frederick Janson Hanbury | Botanical Exchange Club of The British Isles Frederick Janson Hanbury | 12/7/1891 | BIRM |
| Arenaria ciliata | IE, VCH28 Co. Sligo, Benbulbin Range | Frederick Janson Hanbury | Botanical Exchange Club of The British Isles Frederick Janson Hanbury | 13/7/1891 | BIRM |
| Arum italicum | GB, VC10 Isle of Wight, Bonchurch | Frederick Janson Hanbury | Frederick Janson Hanbury | 9/6/1887 | BON |
| Asplenium marinum | GB, VC1 West Cornwall, Saint Mary's, Scilly Isles | Frederick Janson Hanbury | Frederick Janson Hanbury | 1/7/1877 | BON |
| Asplenium obovatum | GB, VC113 Channel Islands, Portelet Bay, Jersey | Frederick Janson Hanbury | Frederick Janson Hanbury | 8/7/1884 | BON |
| Asplenium viride | GB, VC90 Angus, Glen Fiadh,Clova [Glen Fee] | | Frederick Janson Hanbury | 11/7/1882 | BON |
+ | Astragalus alpinus | GB, VC92 South Aberdeenshire | Frederick Janson Hanbury | Charles Bailey | 19/7/1886 | MANCH |
+ | Astragalus alpinus | GB, VC92 South Aberdeenshire | Frederick Janson Hanbury | Charles Bailey Elizabeth Anne Lomax | 19/7/1886 | MANCH |
| Astragalus alpinus | GB, VC92 South Aberdeenshire, Little Craigandal [Creag an Dail Bheag] | Frederick Janson Hanbury | Botanical Exchange Club of The British Isles | 19/7/1886 | SLBI |
| Astragalus alpinus | GB, VC92 South Aberdeenshire, Little Craigandal [Creag an Dail Bheag] | Frederick Janson Hanbury | Botanical Exchange Club of The British Isles Augustin Ley Frederick Janson Hanbury | 19/7/1886 | BIRM |
+ | Atriplex pedunculata | GB, VC15 East Kent, Sandwich | John Thomas Irvine Boswell-Syme | Botanical Exchange Club of The British Isles Charles Bailey Frederick Janson Hanbury | 10/1856 | MANCH |
+ | Atriplex pedunculata | GB, VC15 East Kent, Sandwich | John Thomas Irvine Boswell-Syme | Botanical Exchange Club of The British Isles Charles Bailey Frederick Janson Hanbury | 10/1856 | MANCH |
| Atriplex pedunculata | GB, VC15 East Kent, Sandwich | John Thomas Irvine Boswell-Syme | Botanical Exchange Club of The British Isles Augustin Ley Frederick Janson Hanbury | 10/1856 | BIRM |
| Baldellia ranunculoides | GB, VC106 East Ross & Cromarty, Loch Eye | Frederick Janson Hanbury | | 19/7/1890 | BON |
| Betula nana | GB, VC92 South Aberdeenshire, Little Craigandal [Creag an Dail Bheag] | Frederick Janson Hanbury | Frederick Janson Hanbury | 7/1886 | SLBI |
| Blysmus rufus | GB, VC108 West Sutherland, Naver Bay | Frederick Janson Hanbury | Frederick Janson Hanbury | 12/7/1886 | BON |
| Blysmus rufus | GB, VC108 West Sutherland, River Naver | Frederick Janson Hanbury | Frederick Janson Hanbury William Hadden Beeby | 9/7/1885 | SLBI |
| Briza minor | GB, VC113 Channel Islands, Guernsey | | Frederick Janson Hanbury | 6/1884 | ABS |
| Bromus hordeaceus subsp. hordeaceus | GB, VC3 South Devon, Egg Buckland | | Frederick Janson Hanbury | 19/6/1877 | BON |
| Bupleurum baldense | GB, VC113 Channel Islands, Guernsey,L'Ancresse | Frederick Janson Hanbury | Augustin Ley Frederick Janson Hanbury | 17/6/1884 | BIRM |
| Bupleurum tenuissimum | GB, VC13 West Sussex, Littlehampton | Frederick Janson Hanbury | Charles Edgar Salmon S A Chambers | 5/8/1889 | SLBI |
| Calamagrostis canescens | GB, VC27 East Norfolk, Ranworth | | Frederick Janson Hanbury | 9/7/1883 | ABS |
| Calamagrostis epigejos x Ammophila arenaria = x Calammophila baltica | GB, VC27 East Norfolk, Caister | Frederick Janson Hanbury | Botanical Exchange Club of The British Isles Charles Bailey Frederick Janson Hanbury | 23/8/1886 | MANCH |
| Calamagrostis epigejos x Ammophila arenaria = x Calammophila baltica | GB, VC27 East Norfolk, Caister | Frederick Janson Hanbury | Charles Bailey Frederick Janson Hanbury | 23/8/1880 | MANCH |
| Calamagrostis epigejos x Ammophila arenaria = x Calammophila baltica | GB, VC27 East Norfolk, Caister | Frederick Janson Hanbury | Frederick Janson Hanbury | 23/8/1886 | BON |
| Calamagrostis epigejos x Ammophila arenaria = x Calammophila baltica | GB, VC27 East Norfolk, Caister | Frederick Janson Hanbury | Botanical Exchange Club of The British Isles Augustin Ley | 23/8/1886 | BIRM |
+ | Calamagrostis scotica | GB, VC109 Caithness | Frederick Janson Hanbury | Charles Bailey | 6/7/1886 | MANCH |
| Calamagrostis scotica | GB, VC109 Caithness, Loch Duran | Frederick Janson Hanbury | Botanical Exchange Club of The British Isles Frederick Janson Hanbury | 6/7/1886 | ABS |