Scannell, M. J. P., & Synnott, D. M. (1973). Census catalogue of the flora of Ireland: A concise conspectus of the Irish Pteridophyta, Gymnospermae, and Angiospermae including all the native plants and established aliens known to occur in Ireland with the distribution of each species. Stationery Office.

Scannell, Mary J. P., and Donal M. Synnott. Census Catalogue of the Flora of Ireland: A Concise Conspectus of the Irish Pteridophyta, Gymnospermae, and Angiospermae Including All the Native Plants and Established Aliens Known to Occur in Ireland with the Distribution of Each Species. Stationery Office, 1973.