Euro+Mednot endemicA: Great BritainintroducedA,B; Ireland, with N Ireland (IrelandintroducedC)
Bibliography
A.Tutin, T. G., Heywood, V. H., Burges, N. A., Valentine, D. H., Walters, S. M. & Webb, D. A. 1964–1980: Flora europaea 1-5. – Cambridge: Cambridge University Press
B.Preston, C. D. & Croft, J. M. 1997: Aquatic plants in Britain and Ireland
C.Reynolds, S. C. P. 2002: A catalogue of alien plants in Ireland. – Glasnevin