| Achillea millefolium | GB, VC85 Fifeshire, Pettycur | William Richardson Linton | Augustin Ley | 18/7/1901 | BIRM |
| Adonis autumnalis | GB, VC9 Dorset, Isle of Portland | William Richardson Linton | Augustin Ley William Richardson Linton | 28/5/1889 | BIRM |
+ | Agrostemma githago | GB, VC57 Derbyshire, Yeldersley | William Richardson Linton | | 10/8/1891 | LIV |
| Agrostis canina | GB, VC38 Warwickshire, Balsall Common | Henry Bromwich | William Hunt Painter William Richardson Linton | 8/1894 | SHYB |
| Agrostis canina | GB, VC57 Derbyshire, The Snake Inn, Derby | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley | 11/7/1893 | BIRM |
| Agrostis canina | GB, VC57 Derbyshire, Walton Wood | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley | 10/8/1899 | BIRM |
| Agrostis canina | GB, VC90 Angus, Clova, Forfar | William Richardson Linton | Botanical Exchange Club of The British Isles William Richardson Linton | 17/7/1890 | ABS |
| Agrostis canina | IE, VCH23 Westmeath, Lough Drin | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley William Richardson Linton | 28/7/1895 | BIRM |
| Agrostis capillaris | GB, VC57 Derbyshire, Yeldersley | William Richardson Linton | Augustin Ley | 16/7/1906 | BIRM |
| Agrostis capillaris | GB, VC57 Derbyshire, Yeldersley Cultivated | William Richardson Linton | Augustin Ley | 21/8/1907 | BIRM |
| Agrostis stolonifera | GB, VC57 Derbyshire, Shirley | William Richardson Linton | Botanical Exchange Club of The British Isles William Richardson Linton | 8/1905 | ABS |
| Agrostis stolonifera | GB, VC80 Roxburghshire, Melrose | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley William Richardson Linton | 2/7/1890 | BIRM |
+ | Agrostis stolonifera | GB, VC88 Mid Perthshire, Glen Lyon | Edward Francis Linton William Richardson Linton | | 1/8/1891 | PTH |
| Agrostis stolonifera x Polypogon monspeliensis = x Agropogon littoralis | GB, VC9 Dorset, Littlesea | William Richardson Linton | Edward Francis Linton Harold Stuart Thompson | 27/8/1889 | BIRM |
| Agrostis tenuis | GB, VC11 South Hampshire, Mudeford | William Richardson Linton | Augustin Ley Edward Francis Linton | 27/6/1890 | BIRM |
+ | Ajuga chamaepitys | GB, VC16 West Kent, Cuxton | William Richardson Linton | Alfred Fryer Charles Bailey | 12/6/1882 | MANCH |
+ | Ajuga chamaepitys | GB, VC16 West Kent, Swanley | William Richardson Linton | Charles Bailey William Richardson Linton | 20/7/1886 | MANCH |
+ | Ajuga pyramidalis | GB, VC109 Caithness, Berriedale | William Richardson Linton | Charles Bailey | 21/7/1888 | MANCH |
| Ajuga pyramidalis | GB, VC109 Caithness, Berriedale | | Watson Botanical Exchange Club Augustin Ley William Richardson Linton | 21/7/1888 | BIRM |
| Alchemilla minor | GB, VC57 Derbyshire, Shirley | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley William Richardson Linton | 5/1895 | BIRM |
| Alchemilla minor | GB, VC72 Dumfriesshire, Moffat | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley William Richardson Linton | 7/7/1894 | BIRM |
| Alchemilla pratensis | GB, VC92 South Aberdeenshire, Braemar | William Richardson Linton | Botanical Exchange Club of The British Isles | 20/7/1889 | SLBI |
| Allium oleraceum | GB, VC9 Dorset, Compton Abbas | William Richardson Linton | Augustin Ley Edward Francis Linton | 26/6/1893 | BIRM |
+ | Allium oleraceum | GB, VC57 Derbyshire, Long Eaton | William Richardson Linton | Charles Bailey | 13/7/1897 | MANCH |
| Allium oleraceum | GB, VC57 Derbyshire, Long Eaton | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley | 13/7/1897 | BIRM |
| Alopecurus aequalis | GB, VC57 Derbyshire, Sutton | William Richardson Linton | William Hunt Painter | 19/7/1900 | ABS |
| Alopecurus geniculatus | GB, VC57 Derbyshire, Bradwell | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley | 27/8/1896 | BIRM |
| Alopecurus geniculatus | GB, VC57 Derbyshire, Bradwell, Old Moor | William Richardson Linton | Botanical Exchange Club of The British Isles William Hunt Painter | 27/8/1896 | ABS |
| Antennaria dioica | GB, VC31 Huntingdonshire, Holme Fen | William Richardson Linton | Alfred Fryer Charles Bailey | 23/7/1886 | MANCH |
+ | Anthemis arvensis | GB, VC58 Cheshire, Macclesfield,Lipton | William Richardson Linton | Alfred Fryer Charles Bailey | 10/9/1884 | MANCH |
| Anthoxanthum odoratum | GB, VC57 Derbyshire, Shirley | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley | 2/7/1889 | BIRM |
| Apium nodiflorum x inundatum = A. x moorei | GB, VC57 Derbyshire, Renishaw Canal | William Richardson Linton | | 13/8/1897 | MANCH |
| Apium nodiflorum x inundatum = A. x moorei | GB, VC57 Derbyshire, Renishaw Canal | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley | 13/8/1897 | BIRM |
| Apium nodiflorum x inundatum = A. x moorei | IE, VCH16 West Galway, Munster,Portumna | William Richardson Linton | Botanical Exchange Club of The British Isles Charles Bailey William Richardson Linton | 5/8/1885 | MANCH |
| Apium nodiflorum x inundatum = A. x moorei | IE, VCH16 West Galway, Portumna | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley William Richardson Linton | 5/8/1885 | BIRM |
| Apium repens | IE, VCH10,VCH15, Portumna | Edward Francis Linton William Richardson Linton | Botanical Exchange Club of The British Isles Edward Francis Linton William Hunt Painter | 6/8/1885 | ABS |
| Apium repens | IE, VCH16 West Galway, Portumna Cultivated | | William Richardson Linton | 5/8/1885 | SLBI |
+ | Apium repens | IE, Munster,Portumna | William Richardson Linton | | 5/8/1885 | MANCH |
| Arctium lappa | GB, VC31 Huntingdonshire, Buckden | William Richardson Linton | William Hadden Beeby | 4/9/1886 | SLBI |
| Arctium nemorosum | GB, VC109 Caithness, Reay | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley William Richardson Linton | 21/8/1886 | BIRM |