Literature
- Curtis, T. and R. Thompson ( 2009. ) The Orchids of Ireland. National Museums Northern Ireland, County Down, Northern Ireland.
- Tutin, T. G., V. H. Heywood, N. A. Burges, D. M. Moore, D. H. Valentine, S. M. Walters and D. A. Webb (eds.) ( 1980. ) Flora Europaea, Volume 5. Cambridge University Press, Cambridge, UK.
- Webb, D. A. and M. J. P. Scannell ( 1983. ) Flora of Connemara and the Burren. Royal Dublin Society and Cambridge University Press, Cambridge, UK.
- Webb, D. A., J. Parnell and D. Doogue ( 1996. ) An Irish Flora. Dundalgan Press, Dundalk.