| Teucrium scordium | IE, Ambiguous locality (IE), Lough Derg | William Richardson Linton | Lester Vallis Lester-Garland | | K |
| Fraxinus excelsior | IE, Ambiguous locality (IE), Kilcullen | Robert Desmond Meikle | | 30/9/1950 | K |
| Fraxinus excelsior | IE, Ambiguous locality (IE), Kilcullen | Robert Desmond Meikle | | 30/1/1951 | K |
| Ajuga reptans | IE, VCH40 Co. Londonderry, Mount Benevenagh | Marian Muriel Whiting | | 26/6/1930 | K |
| Ajuga reptans | IE, VCH40 Co. Londonderry, Mount Benevenagh | Marian Muriel Whiting | | 26/6/1930 | K |
| Plantago maritima | IE, VCH40 Co. Londonderry, Mount Benevenagh | Marian Muriel Whiting | | 26/6/1930 | K |
| Plantago maritima | IE, VCH40 Co. Londonderry, Mount Benevenagh | Marian Muriel Whiting | | 26/6/1930 | K |
| Thymus praecox subsp. arcticus | IE, VCH40 Co. Londonderry, Mount Benevenagh | Marian Muriel Whiting | | 26/6/1930 | K |
| Veronica chamaedrys | IE, VCH40 Co. Londonderry, Mount Benevenagh | Marian Muriel Whiting | | 26/6/1930 | K |
| Hypochaeris glabra | IE, VCH40 Co. Londonderry, Magilligan point | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 23/8/1938 | K |
| Thymus praecox subsp. arcticus | IE, VCH40 Co. Londonderry, Magilligan point | John Patrick Micklethwait Brenan Norman Douglas Simpson | | 6/8/1938 | K |
| Digitalis purpurea | IE, VCH40 Co. Londonderry, Glenshane Pass | Marian Muriel Whiting | | 19/6/1930 | K |
| Stachys sylvatica | IE, VCH40 Co. Londonderry, Glenshane Pass | Marian Muriel Whiting | | 19/6/1930 | K |
| Veronica beccabunga | IE, VCH40 Co. Londonderry, Glenshane Pass | Marian Muriel Whiting | | 19/6/1930 | K |
| Fraxinus excelsior | IE, VCH40 Co. Londonderry, Garvagh | | | 13/10/1885 | K |
| Pyrola media | IE, VCH40 Co. Londonderry, Errigal | Robert Lloyd Praeger | | 3/8/1905 | K |
| Pyrola minor | IE, VCH40 Co. Londonderry, Errigal | Robert Lloyd Praeger | Robert Lloyd Praeger | 3/8/1905 | K |
| Blysmus compressus | IE, VCH40 Co. Londonderry, Derry | Charles Baron Clarke | | 11/1887 | K |
| Plantago coronopus | IE, VCH40 Co. Londonderry, Castlerock | Marian Muriel Whiting | | 21/6/1930 | K |
| Thymus praecox subsp. arcticus | IE, VCH40 Co. Londonderry, Castlerock | Marian Muriel Whiting | | 21/6/1930 | K |
| Veronica officinalis | IE, VCH40 Co. Londonderry, Castlerock | William Hancock | William Hancock | 7/1864 | K |
| Veronica serpyllifolia | IE, VCH40 Co. Londonderry, Castlerock | Marian Muriel Whiting | | 21/6/1930 | K |
| Ajuga reptans | IE, VCH40 Co. Londonderry, Carntogher | Marian Muriel Whiting | | 19/6/1930 | K |
| Habenaria viride | IE, VCH39 Co. Antrim, Whitewell, Belfast | William James Coleman Tomlinson | | 1/7/1908 | K |
| Habenaria albida | IE, VCH39 Co. Antrim, Squire's Hill | William Marsden Hind | | 26/6/1857 | K |
| Ajuga reptans | IE, VCH39 Co. Antrim, Shanes Castle | Marian Muriel Whiting | | 19/6/1900 | K |
| Glechoma hederacea | IE, VCH39 Co. Antrim, Shanes Castle | Marian Muriel Whiting | | 19/6/1920 | K |
| Plantago coronopus | IE, VCH39 Co. Antrim, Portrush | James Sykes Gamble | | 5/1888 | K |
| Plantago maritima | IE, VCH39 Co. Antrim, Portrush | James Sykes Gamble | James Sykes Gamble | 5/1888 | K |
| Ajuga reptans | IE, VCH39 Co. Antrim, Lough Neagh | David Allardice Webb | Trinity College, Dublin | 13/5/1950 | K |
| Baldellia ranunculoides | IE, VCH39 Co. Antrim, Lough Neagh | William Hancock | | 27/6/1864 | K |
| Galeopsis angustifolia | IE, VCH39 Co. Antrim, Greenisland | | John McKay Moon | 29/8/1951 | K |
| Galeopsis angustifolia | IE, VCH39 Co. Antrim, Greenisland Cultivated | | John McKay Moon | 11/8/1953 | K |
| Galeopsis angustifolia | IE, VCH39 Co. Antrim, Greenisland Cultivated | | John McKay Moon | 11/8/1953 | K |
| Pyrola media | IE, VCH39 Co. Antrim, Glenbuck | William James Coleman Tomlinson | | 13/7/1907 | K |
| Thymus serpyllum | IE, VCH39 Co. Antrim, Glenariffe | | Shrewsbury Public Library Charles Cardale Babington | 11/9/1852 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | IE, VCH39 Co. Antrim, Glenariff | Charles Cardale Babington | Shrewsbury Public Library | 11/9/1852 | K |
| Callitriche obtusangula | IE, VCH39 Co. Antrim, Giants Causeway | James Sykes Gamble | James Sykes Gamble | 5/1888 | K |
| Veronica serpyllifolia | IE, VCH39 Co. Antrim, Cave Hill | William Hancock | | 13/5/1864 | K |
| Lamium confertum | IE, VCH39 Co. Antrim, Bushmills | N H Sinnott | | 11/10/1970 | K |