Literature
- Curtis, T. G. F. and J. A. Neff (unpubl.) Scarce Plants List, from the Proposed Red Data List of Vascular Plants in Ireland (rcdoct2005.xls) from: http://www.botanicgardens.ie/gspc/news/news.htm. .
- 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.