| Cerastium fontanum subsp. scoticum | GB, VC90 Angus, Meikle Kilrannoch | Micheline Joan Sheehy Skeffington | | 22/7/1986 | GALW |
| Chenopodium album | IE, VCH16 West Galway, Nuns Island | Micheline Joan Sheehy Skeffington | | 7/10/1983 | GALW |
| Cochlearia danica | IE, VCH6 Co. Waterford, Kilfarrasy | Micheline Joan Sheehy Skeffington | Trinity College, Dublin | 18/5/1980 | GALW |
| Cochlearia danica | IE, VCH16 West Galway, Galway | Micheline Joan Sheehy Skeffington | | 18/4/1983 | GALW |
| Cochlearia danica | IE, VCH21 Co. Dublin, Howth | Micheline Joan Sheehy Skeffington | Trinity College, Dublin | 9/6/1979 | GALW |
| Cochlearia danica | IE, VCH21 Co. Dublin, Howth | Micheline Joan Sheehy Skeffington | | 9/6/1979 | GALW |
| Cochlearia officinalis subsp. scotica | IE, VCH9 Co. Clare, Eararna | Micheline Joan Sheehy Skeffington | | 12/5/1981 | GALW |
| Cochlearia officinalis subsp. scotica | IE, VCH35 West Donegal, Kincaslough | Micheline Joan Sheehy Skeffington | | 16/6/1979 | GALW |
| Cochlearia pyrenaica | GB, Perthshire, Caenlochan | Micheline Joan Sheehy Skeffington | | 23/7/1986 | GALW |
| Cochlearia pyrenaica subsp. alpina | IE, VCH28 Co. Sligo, Benbulbin | Micheline Joan Sheehy Skeffington | | 10/6/1981 | GALW |
| Coronopus didymus | IE, VCH16 West Galway, Galway | Micheline Joan Sheehy Skeffington | | 18/4/1983 | GALW |
| Coronopus didymus | IE, VCH20 Co. Wicklow, Wicklow | Micheline Joan Sheehy Skeffington | Irish Biogeographical Society | 19/5/1979 | GALW |
| Coronopus squamatus | IE, VCH15 South-east Galway, Craughwell | Micheline Joan Sheehy Skeffington | | 20/6/1984 | GALW |
| Cruciata laevipes | FR, Baisieux | Micheline Joan Sheehy Skeffington | | 21/8/1981 | GALW |
| Cryptogramma crispa | GB, VC90 Angus, Caenlochan | Micheline Joan Sheehy Skeffington | | 23/7/1986 | GALW |
| Cystopteris fragilis | IE, VCH17 North-east Galway, Annaghdown | Micheline Joan Sheehy Skeffington | | 21/6/1981 | GALW |
| Daboecia cantabrica | IE, VCH16 West Galway, Rushennamanagh | Micheline Joan Sheehy Skeffington | | 20/8/1986 | GALW |
| Draba muralis | IE, VCH16 West Galway, University College Galway | Micheline Joan Sheehy Skeffington | | 26/4/1981 | GALW |
| Drosera intermedia | FR, Lanneanaou, Morlaix, Brittany | Micheline Joan Sheehy Skeffington | | 13/8/1981 | GALW |
| Dryopteris filix-mas | IE, VCH17 North-east Galway, Briar Hill | Micheline Joan Sheehy Skeffington | | 5/7/1981 | GALW |
| Epilobium anagallidifolium | GB, VC90 Angus, Meikle Kilrannoch | Micheline Joan Sheehy Skeffington | | 22/7/1986 | GALW |
| Epilobium ciliatum | IE, VCH16 West Galway, Galway | Micheline Joan Sheehy Skeffington | | | GALW |
| Epilobium lanceolatum | FR, Ille et Vilaine, Brittany | Micheline Joan Sheehy Skeffington | | 5/8/1981 | GALW |
| Epilobium montanum | IE, VCH16 West Galway, Galway | Micheline Joan Sheehy Skeffington | | 28/6/1983 | GALW |
| Epilobium obscurum | IE, VCH16 West Galway, University of Galway | Hugh O'Donnell | | 29/6/1983 | GALW |
| Equisetum | IE, VCH19 Co. Kildare, Tankardstown | Micheline Joan Sheehy Skeffington | | 20/6/1982 | GALW |
| Equisetum arvense | IE, VCH16 West Galway, Galway | Micheline Joan Sheehy Skeffington | | 11/4/1988 | GALW |
| Equisetum fluviatile x arvense = E. x litorale | IE, VCH16 West Galway, Lough Mask | Micheline Joan Sheehy Skeffington | | 26/7/1980 | GALW |
| Equisetum palustre | IE, VCH9 Co. Clare, Cappanawalla | Micheline Joan Sheehy Skeffington | | 1/6/1986 | GALW |
| Equisetum palustre | IE, VCH28 Co. Sligo, Benbulbin | Micheline Joan Sheehy Skeffington | | 10/6/1982 | GALW |
| Equisetum palustre | IE, VCH28 Co. Sligo, Rosses Point | Micheline Joan Sheehy Skeffington | | 9/6/1982 | GALW |
| Equisetum variegatum | IE, VCH26,VCH27,VCH28, Carrower | Micheline Joan Sheehy Skeffington | | 8/6/1981 | GALW |
| Equisetum variegatum | IE, VCH26 East Mayo, Bunnyconnellan | Micheline Joan Sheehy Skeffington | | 28/5/1981 | GALW |
| Eriophorum angustifolium | IE, VCH26,VCH28, Carrownaglogh | Micheline Joan Sheehy Skeffington | | 8/6/1981 | GALW |
| Eriophorum angustifolium | IE, VCH16 West Galway, Rossaveel | Micheline Joan Sheehy Skeffington | | 17/5/1981 | GALW |
| Eriophorum gracile | IE, Kerry, Killarney | Micheline Joan Sheehy Skeffington | | 9/6/1982 | GALW |
| Eriophorum gracile | IE, VCH16 West Galway, Maam Cross | Micheline Joan Sheehy Skeffington | | 27/7/1980 | GALW |
| Eriophorum latifolium | IE, VCH21 Co. Dublin, Ballyman | Micheline Joan Sheehy Skeffington | Irish Biogeographical Society | 6/1978 | GALW |
| Eriophorum vaginatum | IE, VCH9 Co. Clare, Lisdoonvarna | Micheline Joan Sheehy Skeffington | | 11/6/1981 | GALW |
| Eriophorum vaginatum | IE, VCH9 Co. Clare, Lough Coller | Micheline Joan Sheehy Skeffington | | 8/6/1981 | GALW |