| Juncus bulbosus | IE, VCH23 Westmeath | | Harry Corbyn Levinge | 1891 | SLBI |
| Juncus bulbosus | IE, VCH23 Westmeath, Knockdrin | Harry Corbyn Levinge | Botanical Exchange Club of The British Isles Augustin Ley Harry Corbyn Levinge | 8/7/1893 | BIRM |
| Juncus bulbosus | IE, VCH23 Westmeath, Quarry Bog | Harry Corbyn Levinge | Augustin Ley Harry Corbyn Levinge | 15/8/1891 | BIRM |
| Juncus tenuis | IE, Cork, Lauragh | Reginald Wiliam Scully | Harry Corbyn Levinge | 7/8/1894 | SHYB |
| Limosella aquatica | IE, VCH9 Co. Clare, Corofin | Patrick Bernard O'Kelly | Botanical Exchange Club of The British Isles Augustin Ley Harry Corbyn Levinge | 13/7/1892 | BIRM |
| Limosella aquatica | IE, VCH9 Co. Clare, Inchiquin Lough | Patrick Bernard O'Kelly | Harold Stuart Thompson Harry Corbyn Levinge | 13/7/1893 | BIRM |
| Marrubium vulgare | IE, VCH9 Co. Clare, Black Head | Harry Corbyn Levinge | | 21/6/1891 | K |
| Marrubium vulgare | IE, VCH9 Co. Clare, Black Head | Harry Corbyn Levinge | Harry Corbyn Levinge | 21/6/1891 | K |
| Mentha arvensis x aquatica = M. x verticillata | IE, VCH23 Westmeath, Knockdrin | Harry Corbyn Levinge | | 23/8/1888 | DBN |
| Mentha arvensis x spicata = M. x gracilis | GB, VC57 Derbyshire, Miller's Dale | Harry Corbyn Levinge | | 7/9/1893 | LIV |
| Mentha spicata | IE, VCH23 Westmeath, River Gaine | Harry Corbyn Levinge | James Sykes Gamble | 27/9/1888 | K |
| Mentha spicata x suaveolens = M. x villosa | GB, VC57 Derbyshire, Matlock | A Steuart Eleonora Armitage Harry Corbyn Levinge | Harry Corbyn Levinge John Durbin Gray | 30/8/1893 | CGE |
| Minuartia verna | IE, VCH9 Co. Clare, Ballyvaghan | Harry Corbyn Levinge | Science & Art Museum Dublin Harry Corbyn Levinge | 19/5/1892 | GALW |
| Moehringia trinervia | IE, VCH23 Westmeath | Harry Corbyn Levinge | Dublin Museum Irish National Herbarium Glasnevin Dublin | 24/7/1890 | GALW |
+ | Myriophyllum verticillatum | IE, VCH20 Co. Wicklow, nr Mullingar | Harry Corbyn Levinge | Botanical Exchange Club of The British Isles Charles Bailey Harry Corbyn Levinge | 22/7/1895 | MANCH |
| Neckeria lutea | IE, VCH20 Co. Wicklow, Ballyarthur | R Bayly | Harry Corbyn Levinge William Hunt Painter | 8/8/1894 | ABS |
| Neotinea maculata | IE, VCH9 Co. Clare, Ballyvaughan | Harry Corbyn Levinge | Augustin Ley Harry Corbyn Levinge | 18/5/1892 | BIRM |
| Neotinea maculata | IE, VCH9 Co. Clare, Burren | Patrick Bernard O'Kelly | Augustin Ley Harry Corbyn Levinge | 5/1894 | BIRM |
| Neotinea maculata | IE, VCH9 Co. Clare, Glanquin | Harry Corbyn Levinge | Harry Corbyn Levinge | 20/5/1892 | ABS |
| Neotinea maculata | IE, VCH9 Co. Clare, Glenquin | Harry Corbyn Levinge | Botanical Exchange Club of The British Isles Harry Corbyn Levinge | 20/5/1893 | ABS |
| Neotinea maculata | IE, VCH9 Co. Clare, Glenquin House | Harry Corbyn Levinge | Botanical Exchange Club of The British Isles Augustin Ley Harry Corbyn Levinge | 20/5/1892 | BIRM |
| Oenanthe fistulosa | IE, VCH20 Co. Wicklow, The Murrough | Harry Corbyn Levinge | | 10/7/1890 | K |
| Oenanthe fistulosa | IE, VCH23 Westmeath, Lough Ennell | Harry Corbyn Levinge | Harry Corbyn Levinge | 6/8/1891 | K |
| Pilosella aurantiaca | IE, VCH17 North-east Galway, Mount Bellew | M Bayly | Harry Corbyn Levinge | 19/7/1894 | ABS |
| Pilosella aurantiaca | IE, Galway, Mount Bellow | Harry Corbyn Levinge | Harry Corbyn Levinge M Bayly | 19/7/1894 | SHYB |
| Pimpinella major | IE, VCH9 Co. Clare, Kilrush | Patrick Bernard O'Kelly | Harry Corbyn Levinge | 13/7/1893 | GALW |
| Pimpinella major | IE, VCH9 Co. Clare, Scattery Island | Patrick Bernard O'Kelly | Harry Corbyn Levinge | 13/7/1893 | GALW |
| Plantago maritima | GB, VC49 Caernarvonshire, Criccieth | Harry Corbyn Levinge | James Sykes Gamble | 8/1884 | K |
| Polypodium vulgare | IE, VCH23 Westmeath, Knock Ross | Harry Corbyn Levinge | Botanical Exchange Club of The British Isles Augustin Ley Harry Corbyn Levinge | 17/6/1892 | BIRM |
| Potamogeton coloratus x berchtoldii = P. x lanceolatus | IE, VCH9 Co. Clare, Cahir River | Patrick Bernard O'Kelly | Dublin Museum Harry Corbyn Levinge Harold Stuart Thompson | 12/7/1894 | BIRM |
+ | Potamogeton friesii | IE, VCH20 Co. Wicklow, Loch Derravaragh | Harry Corbyn Levinge | Charles Bailey Harry Corbyn Levinge | 24/7/1895 | MANCH |
| Potamogeton friesii | IE, VCH23 Westmeath, Lough Derravaragh | Harry Corbyn Levinge | | 24/7/1895 | BIRM |
| Potamogeton gramineus | IE, VCH25 Co. Roscommon, River Suck | Harry Corbyn Levinge | Watson Botanical Exchange Club Arthur Bennett Harold Stuart Thompson | 26/7/1891 | BIRM |
| Potamogeton lucens | IE, VCH23 Westmeath, Lough Derravaragh | Harry Corbyn Levinge | | 9/8/1892 | MANCH |
| Potamogeton lucens | IE, VCH23 Westmeath, Lough Derravaragh | Harry Corbyn Levinge | Botanical Exchange Club of The British Isles Augustin Ley | 9/8/1892 | BIRM |
| Potentilla fruticosa | IE, VCH9 Co. Clare, Ballyvaughan | Harry Corbyn Levinge | Dublin Museum Irish National Herbarium Glasnevin Dublin Harry Corbyn Levinge | 17/5/1892 | GALW |
| Potentilla fruticosa | IE, VCH9 Co. Clare, Turlough | Harry Corbyn Levinge | Harold Stuart Thompson Harry Corbyn Levinge | 17/5/1892 | BIRM |
| Pyrola rotundifolia | IE, VCH23 Westmeath, Loughanstown | Harry Corbyn Levinge | Harold Stuart Thompson Harry Corbyn Levinge | 21/6/1892 | BIRM |
| Pyrola rotundifolia | IE, VCH23 Westmeath, Scragh Bog | Harry Corbyn Levinge Henry Groves James Groves | Allan Octavian Hume Henry & James Groves | 4/8/1892 | SLBI |
| Pyrola rotundifolia | IE, Loughanstown | Harry Corbyn Levinge James Groves | Allan Octavian Hume | 14/8/1892 | SLBI |