| Ranunculus baudotii | IE, VCH9 Co. Clare, New Quay | Harry Corbyn Levinge | William Hunt Painter | 18/5/1892 | ABS |
| Ranunculus baudotii x trichophyllus = R. x segretii | IE, VCH23 Westmeath, Knockdrin | Harry Corbyn Levinge | Harry Corbyn Levinge William Hunt Painter | 2/6/1895 | ABS |
| Ranunculus trichophyllus | IE, VCH23 Westmeath, Knock Drui, Co. West Meath | Harry Corbyn Levinge | | 10/7/1893 | SHYB |
| Ranunculus trichophyllus | IE, VCH23 Westmeath, Knock Drui, Co. West Meath | Harry Corbyn Levinge | Harry Corbyn Levinge William Hunt Painter | 2/4/1895 | SHYB |
| Ranunculus trichophyllus | IE, VCH23 Westmeath, Knock Drui, Co. West Meath | Harry Corbyn Levinge | Harry Corbyn Levinge William Hunt Painter | 15/6/1894 | ABS |
| Ranunculus trichophyllus | IE, VCH23 Westmeath, Knockdrin | Harry Corbyn Levinge | Harry Corbyn Levinge | 2/6/1895 | SHYB |
| Rhinanthus | IE, VCH23 Westmeath, Mullingar, Bog of Lynn | Edward Shearburn Marshall | Harry Corbyn Levinge William Hunt Painter | 22/7/1895 | SHYB |
| Rhinanthus minor | IE, VCH23 Westmeath, Mullingar, Bog of Lynn | Edward Shearburn Marshall | Botanical Exchange Club of The British Isles Harry Corbyn Levinge William Hunt Painter | 22/7/1895 | ABS |
| Rhinanthus minor subsp. stenophyllus | IE, VCH23 Westmeath, Bog of Lynn | Edward Shearburn Marshall | Harry Corbyn Levinge | 22/7/1895 | SLBI |
| Rosa villosa | IE, VCH23 Westmeath, Knock Ross | Harry Corbyn Levinge | Irish National Herbarium Glasnevin Dublin Science & Art Museum Dublin Harry Corbyn Levinge | 9/9/1892 | GALW |
| Rubus amplificatus | IE, VCH23 Westmeath, Knock Drui, Co. West Meath | Harry Corbyn Levinge | Harry Corbyn Levinge | 28/8/1895 | SLBI |
| Rubus fuscus | IE, VCH23 Westmeath, Knock | Harry Corbyn Levinge | Harry Corbyn Levinge William Hunt Painter | 17/7/1894 to 20/8/1894 | SHYB |
| Rubus leptothyrsos | IE, VCH23 Westmeath, Knock Drui, Co. West Meath | Harry Corbyn Levinge | Harry Corbyn Levinge | 31/7/1895 | ABS |
| Rubus macrophyllus var. schlechtendalii | IE, VCH23 Westmeath, Knock | Harry Corbyn Levinge | | 28/8/1895 | ABS |
| Rubus macrophyllus var. schlechtendalii | IE, VCH23 Westmeath, Knockdrin | Harry Corbyn Levinge | Harry Corbyn Levinge William Hunt Painter | 28/8/1895 | ABS |
| Rubus pyramidalis | IE, VCH23 Westmeath, Knock Drui | Harry Corbyn Levinge | Harry Corbyn Levinge William Hunt Painter | 31/7/1895 | SHYB |
| Rubus rubristylus | IE, VCH23 Westmeath, Crooked Wood | Harry Corbyn Levinge | Harry Corbyn Levinge | 6/8/1895 | ABS |
| Rubus rubristylus | IE, VCH23 Westmeath, Crooked Wood | Harry Corbyn Levinge | | 6/8/1895 | SLBI |
| Rumex crispus | IE, VCH23 Westmeath, Knockdrin | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley Harry Corbyn Levinge | 27/7/1895 | BIRM |
| Rumex crispus x obtusifolius = R. x pratensis | IE, VCH23 Westmeath, Knockdrin | William Richardson Linton | Botanical Exchange Club of The British Isles Charles Bailey Harry Corbyn Levinge | 27/7/1895 | MANCH |
| Rumex crispus x obtusifolius = R. x pratensis | IE, VCH23 Westmeath, Knockdrin | William Richardson Linton | Botanical Exchange Club of The British Isles Charles Bailey Harry Corbyn Levinge | 27/7/1895 | MANCH |
| Rumex crispus x obtusifolius = R. x pratensis | IE, VCH23 Westmeath, Knockdrin | William Richardson Linton | Botanical Exchange Club of The British Isles Charles Bailey Harry Corbyn Levinge | 27/7/1895 | MANCH |
| Salix pentandra | IE, VCH23 Westmeath, Bog of Lynn | Harry Corbyn Levinge | Harry Corbyn Levinge | 14/6/1895 | SHYB |
| Saxifraga rosacea | IE, VCH9 Co. Clare, Black Head | Harry Corbyn Levinge | Croydon Natural History and Scientific Society Henry Franklin Parsons | 19/5/1892 | SLBI |
| Saxifraga rosacea | IE, VCH9 Co. Clare, Black Head | Harry Corbyn Levinge | Botanical Exchange Club of The British Isles Augustin Ley | 19/5/1892 | BIRM |
| Saxifraga rosacea | IE, VCH9 Co. Clare, Black Head | Harry Corbyn Levinge | Augustin Ley Harry Corbyn Levinge | 21/6/1891 | BIRM |
| Saxifraga rosacea | IE, VCH9 Co. Clare, Blackhead Bay | Harry Corbyn Levinge | Botanical Exchange Club of The British Isles William Hunt Painter | 19/5/1892 | ABS |
| Scrophularia auriculata | IE, VCH23 Westmeath, Donore | Harry Corbyn Levinge | Harry Corbyn Levinge William Hunt Painter | 13/9/1895 | ABS |
| Scrophularia auriculata | IE, VCH23 Westmeath, Lough Derravaragh | Harry Corbyn Levinge | Botanical Exchange Club of The British Isles Augustin Ley | 13/9/1895 | BIRM |
| Scrophularia auriculata | IE, VCH23 Westmeath, Multyfarnham,Donore | Harry Corbyn Levinge | Harry Corbyn Levinge | 13/9/1895 | SLBI |
| Scutellaria galericulata | GB, VC49 Caernarvonshire, Criccieth | Harry Corbyn Levinge | | 8/1854 | K |
| Scutellaria minor | GB, VC49 Caernarvonshire, Criccieth | Harry Corbyn Levinge | James Sykes Gamble | 8/1884 | K |
| Sesleria caerulea | IE, VCH15 South-east Galway, Castle Taylor | Harry Corbyn Levinge | | 16/5/1894 | ABS |
| Sesleria caerulea | IE, VCH15 South-east Galway, Castle Taylor | Harry Corbyn Levinge | Augustin Ley Harry Corbyn Levinge | 16/5/1892 | BIRM |
| Silene latifolia subsp. alba | IE, VCH21 Co. Dublin, Portmarnock | Harry Corbyn Levinge | Dublin Museum Irish National Herbarium Glasnevin Dublin | 12/7/1890 | GALW |
| Sium latifolium | IE, VCH9 Co. Clare, Ennis | Patrick Bernard O'Kelly | Harry Corbyn Levinge Patrick Bernard O'Kelly | 12/8/1891 | K |
| Sium latifolium | IE, VCH9 Co. Clare, Ennis | Patrick Bernard O'Kelly | Harry Corbyn Levinge | 13/7/1891 | K |
| Sium latifolium | IE, VCH15 South-east Galway, Portumna | Harry Corbyn Levinge | Harry Corbyn Levinge | 20/8/1892 | GALW |
| Sium latifolium | IE, VCH16 West Galway, Portumna | Harry Corbyn Levinge | Dublin Museum | 20/8/1892 | GALW |
| Stellaria palustris | IE, VCH23 Westmeath, Lough Ennell | Harry Corbyn Levinge | | 14/8/1891 | K |