| Equisetum variegatum | IE, VCH19,VCH22, Maynooth | Samuel Alexander Stewart | Augustin Ley | 15/5/1876 | BIRM |
+ | Carex divisa | IE, VCH38 Co. Down | Samuel Alexander Stewart | Botanical Exchange Club Charles Bailey | 6/1876 | MANCH |
| Carex arenaria | IE, VCH38 Co. Down | Samuel Alexander Stewart | William Hadden Beeby | 6/1876 | SLBI |
| Carex arenaria | IE, VCH38 Co. Down | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Frederick Janson Hanbury | 6/1876 | BM |
| Carex arenaria | IE, VCH38 Co. Down | Samuel Alexander Stewart | Edward Francis Linton | 6/1876 | BM |
| Carex arenaria | IE, VCH38 Co. Down, Co. Down | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Augustin Ley | 6/1876 | BIRM |
| Zannichellia polycarpa | IE, VCH38,VCH39, Belfast | Samuel Alexander Stewart | William Hadden Beeby | 23/8/1876 | SLBI |
| Zannichellia palustris | IE, VCH38,VCH39, Belfast | Samuel Alexander Stewart | Augustin Ley | 23/8/1876 | BIRM |
| Valerianella carinata | IE, VCH38 Co. Down, Dundonald | Samuel Alexander Stewart | Augustin Ley | 19/6/1877 | BIRM |
+ | Calamagrostis stricta | IE, VCH39 Co. Antrim, Lough Neagh | Samuel Alexander Stewart | Botanical Exchange Club Charles Bailey | 30/6/1877 | MANCH |
+ | Calamagrostis stricta | IE, VCH39 Co. Antrim, Lough Neagh | Samuel Alexander Stewart | Botanical Exchange Club Charles Bailey | 30/6/1877 | MANCH |
| Najas flexilis | IE, VCH16 West Galway, Roundstone | Samuel Alexander Stewart | Augustin Ley | 15/8/1877 | BIRM |
| Najas flexilis | IE, VCH16 West Galway, Roundstone | Samuel Alexander Stewart | Harold Stuart Thompson | 15/8/1877 | BIRM |
| Daboecia cantabrica | IE, VCH16 West Galway, Lough Uggool | Samuel Alexander Stewart | William Hadden Beeby | 18/8/1877 | SLBI |
| Daboecia cantabrica | IE, Mayo, Uggool | Samuel Alexander Stewart | Robert Large Baker | 19/8/1877 | BIRM |
| Adiantum capillus-veneris | IE, VCH9 Co. Clare, Black Head | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Augustin Ley Samuel Alexander Stewart | 15/7/1878 | BIRM |
| Saxifraga umbrosa x hirsuta = S. x geum | IE, VCH1 South Kerry, Brandon Mountain | Samuel Alexander Stewart | Arthur Bennett | 18/7/1878 | SLBI |
| Zannichellia palustris | IE, VCH39 Co. Antrim, Belfast | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Samuel Alexander Stewart | 12/8/1878 | ABS |
| Barbarea intermedia | IE, VCH39 Co. Antrim, Whitewell, Belfast | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Augustin Ley | 15/6/1879 | 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 |
+ | Equisetum hyemale x variegatum = E. x trachyodon | IE, VCH39 Co. Antrim, Colin Glen | Samuel Alexander Stewart | | 22/6/1879 | BIRM |
| Polygala vulgaris | IE, VCH28 Co. Sligo, Benbulben | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Augustin Ley | 16/7/1879 | BIRM |
| Polygala vulgaris | IE, VCH28 Co. Sligo, Benbulben | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Edward Francis Linton | 16/7/1879 | SLBI |
| Dryas octopetala | IE, VCH28 Co. Sligo, Benbulben | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles | 16/7/1879 | SLBI |
| Arenaria ciliata | IE, VCH28 Co. Sligo, Kings Mountain | Samuel Alexander Stewart | Botanical Exchange Club William Hunt Painter | 18/7/1879 | ABS |
| Arenaria ciliata | IE, VCH28 Co. Sligo, Kings Mountain | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Charles Bailey | 18/7/1879 | BIRM |
| Arenaria ciliata | IE, VCH28 Co. Sligo, Kings Mountain | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles William Hadden Beeby | 18/7/1879 | SLBI |
| Arenaria ciliata | IE, VCH28 Co. Sligo, Kings Mountain | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Augustin Ley | 18/7/1879 | BIRM |
| Arenaria ciliata | IE, VCH28 Co. Sligo, Kings Mountain | Samuel Alexander Stewart | Reginald Wiliam Scully | 18/7/1879 | SLBI |
| Arenaria ciliata | IE, VCH28 Co. Sligo, Kings Mountain | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Allan Octavian Hume | 18/7/1879 | SLBI |
| Potamogeton berchtoldii | IE, VCH39 Co. Antrim, Lough Neagh | Samuel Alexander Stewart | Alfred Fryer | 28/6/1880 | MANCH |
| Apium nodiflorum x inundatum = A. x moorei | IE, VCH16 West Galway, Doonpatrick | Samuel Alexander Stewart | Samuel Alexander Stewart | 7/1880 | BIRM |
| Apium nodiflorum x inundatum = A. x moorei | IE, VCH38 Co. Down, Downpatrick | Samuel Alexander Stewart | Charles Bailey | 7/1880 | MANCH |
| Apium nodiflorum x inundatum = A. x moorei | IE, VCH38 Co. Down, Downpatrick,Quoile | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Augustin Ley | 7/1880 | BIRM |
| Potamogeton perfoliatus | IE, VCH39 Co. Antrim, Lough Mourne | Samuel Alexander Stewart | Alfred Fryer Charles Bailey | 19/7/1880 | MANCH |
| Potamogeton lucens x gramineus = P. x angustifolius | IE, VCH30 Co. Cavan | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Arthur Bennett | 6/7/1881 | ABS |
+ | Potamogeton praelongus | IE, VCH39 Co. Antrim, Rathlin Island,Ushet Lough | Samuel Alexander Stewart | Alfred Fryer Charles Bailey | 4/8/1882 | MANCH |
| Scrophularia auriculata | IE, VCH39 Co. Antrim, Four Mile Burn | Samuel Alexander Stewart | Alexander Somerville | 22/7/1883 | E |
| Potamogeton lucens x gramineus = P. x angustifolius | IE, VCH40 Co. Londonderry, coleraine | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Charles Bailey | 29/7/1883 | MANCH |
| Polygala vulgaris | IE, VCH28 Co. Sligo, Benbulben | Samuel Alexander Stewart | Reginald Wiliam Scully | 3/8/1883 | SLBI |