Literature
- Preston, C. D., D. A. Pearson and T. D. Dines ( 2002. ) New Atlas of the British and Irish Flora. Oxford University Press, UK.
- Stace, C. ( 1997. ) New Flora of the British Isles. Cambridge University Press, The Bath Press, 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.