| Potamogeton perfoliatus x crispus = P. x cooperi | IE, VCH39 Co. Antrim, Templepatrick | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Augustin Ley | 10/8/1894 | BIRM |
| Agrimonia procera | IE, VCH39 Co. Antrim, Shanes Castle | Charles Cardale Babington | Charles Cardale Babington George Stephen West | 9/9/1852 | BIRM |
| Saxifraga hirculus | IE, VCH39 Co. Antrim, Rasharkin | David Moore | Harold Stuart Thompson | | BIRM |
| Viola tricolor subsp. curtisii | IE, VCH39 Co. Antrim, Portrush | Charles Bailey | Botanical Exchange Club of The British Isles Augustin Ley | 15/7/1896 | BIRM |
| Bidens cernua | IE, VCH39 Co. Antrim, Portmore Lough | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Augustin Ley | 27/8/1886 | BIRM |
| Carex elata | IE, VCH39 Co. Antrim, Portmore | Samuel Alexander Stewart | Augustin Ley | 20/6/1872 | BIRM |
| Carex pauciflora | IE, VCH39 Co. Antrim, Parkmore | Arthur Wilson Stelfox | Harold Stuart Thompson | | BIRM |
| Callitriche autumnalis | IE, VCH39 Co. Antrim, Lough Neagh | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 13/8/1909 | BIRM |
| Carex elongata | IE, VCH39 Co. Antrim, Lough Neagh | David Moore | Charles Cardale Babington George Stephen West | | BIRM |
| Carex nigra | IE, VCH39 Co. Antrim, Lough Neagh | William Mateer | Harold Stuart Thompson Thomas Clark | 7/1849 | BIRM |
| Carex oederi | IE, VCH39 Co. Antrim, Lough Neagh | Richard Charles L'Estrange Burges | | 9/8/1949 | BIRM |
| Littorella uniflora | IE, VCH39 Co. Antrim, Lough Neagh | William West | George Stephen West William West | 6/1900 | BIRM |
| Sedum album | IE, VCH39 Co. Antrim, Lough Neagh | Richard Charles L'Estrange Burges | | 9/8/1949 | BIRM |
| Viola tricolor subsp. curtisii | IE, VCH39 Co. Antrim, Lough Neagh | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Augustin Ley | 25/6/1886 | BIRM |
| Elatine hexandra | IE, VCH39 Co. Antrim, Lagan Canal | William Mateer | Augustin Ley | 8/1847 | BIRM |
| Elatine hydropiper | IE, VCH39 Co. Antrim, Lagan Canal | William Mateer | Harold Stuart Thompson Thomas Clark | 8/1847 | BIRM |
| Salix viminalis x caprea = S. x smithiana | IE, VCH39 Co. Antrim, Kilroot | Samuel Alexander Stewart | George Stephen West | 5/1868 | BIRM |
| Equisetum sylvaticum | IE, VCH39 Co. Antrim, Glenariff | Douglas Montague Heath | Douglas Montague Heath | 7/1955 | BIRM |
| Euphrasia curta var. glabrescens | IE, VCH39 Co. Antrim, Giants Causeway | Frederick Arundel Rogers | Augustin Ley | 7/1901 | BIRM |
| Geranium robertianum | IE, VCH39 Co. Antrim, Giants Causeway | Charles Bailey | Charles Bailey | 11/7/1896 | BIRM |
| Equisetum hyemale | IE, VCH39 Co. Antrim, Divis, Crow Glen | William Mateer | Harold Stuart Thompson Thomas Clark William Mateer | 5/1847 | BIRM |
| Leontodon saxatilis | IE, VCH39 Co. Antrim, Divis | | William Marsden Hind | 1/9/1862 | BIRM |
| Equisetum arvense | IE, VCH39 Co. Antrim, Cushendall | Charles Bailey | | 9/7/1896 | BIRM |
| Polystichum setiferum | IE, VCH39 Co. Antrim, Colin Glen | William Mateer | Harold Stuart Thompson Thomas Clark William Mateer | 7/1847 | BIRM |
| Rosa sherardii | IE, VCH39 Co. Antrim, Carnlough | Coslett Herbert Waddell | Botanical Exchange Club of The British Isles Coslett Herbert Waddell | 9/8/1910 | BIRM |
| Elatine hydropiper | IE, VCH39 Co. Antrim, Belfast,Lagan Canal | William Mateer | George Stephen West | 8/1847 | BIRM |
| Equisetum hyemale x variegatum = E. x trachyodon | IE, VCH39 Co. Antrim, Belfast,Colin Glen | Samuel Alexander Stewart | Harold Stuart Thompson | 22/6/1879 | BIRM |
| Digitaria ischaemum | IE, VCH39 Co. Antrim, Belfast | | London Botanical Exchange Club Robert Large Baker | 13/9/1872 | BIRM |
| Equisetum pratense | IE, VCH39 Co. Antrim, Belfast | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | 5/1901 | BIRM |
| Potamogeton praelongus x crispus = P. x undulatus | IE, VCH39 Co. Antrim, Belfast | George Taylor | | 9/1952 | BIRM |
| Senecio jacobaea | IE, VCH39 Co. Antrim, Belfast | James Walter White | Watson Botanical Exchange Club Harold Stuart Thompson James Walter White | 27/7/1926 | BIRM |
| Alchemilla xanthochlora | IE, VCH39 Co. Antrim, Ballintoy | Charles Bailey | Charles Bailey | 11/7/1896 | BIRM |
| Angelica archangelica | IE, VCH39 Co. Antrim, Ballintoy IE, VCH39 Co. Antrim, Carrickarade Island | Charles Bailey | Botanical Exchange Club of The British Isles Charles Bailey | 11/7/1896 | BIRM |
| Callitriche hermaphroditica | IE, VCH39 Co. Antrim, Antrim | William Mateer | Harold Stuart Thompson Thomas Clark | | BIRM |
| Limonium humile | IE, VCH38 Co. Down, Strangford Lough | Richard Charles L'Estrange Burges | | 11/8/1949 | BIRM |
| Puccinellia maritima | IE, VCH38 Co. Down, Strangford Lough | Robert Lloyd Praeger | Harold Stuart Thompson | 10/7/1905 | BIRM |
| Linaria repens | IE, VCH38 Co. Down, Spelgo Mountain | Frederick Janson Hanbury | Augustin Ley | 7/1891 | BIRM |
| Callitriche hamulata | IE, VCH38 Co. Down, Sheepbridge | Henry William Lett | Watson Botanical Exchange Club Harold Stuart Thompson Henry William Lett | 6/6/1901 | BIRM |
| Ranunculus penicillatus subsp. pseudofluitans | IE, VCH38 Co. Down, Sheepbridge | Henry William Lett | Watson Botanical Exchange Club Harold Stuart Thompson Henry William Lett | 6/6/1901 | BIRM |
| Circaea lutetiana x alpina = C. x intermedia | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | | BIRM |