Euro+MedendemicA: France, with Channel is. and Monaco (FrancenativeA,B); Great BritainnaturalisedC; Ireland, with N Ireland (Northern IrelandintroducedD); Spain, with Gibraltar and AndorranativeB (SpainnativeE,F)
A.Guinochet, M. & Vilmorin, R. de 1978: Flore de France 3. – Paris
B.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
C.Stace, C. 2010: New Flora of the British Isles, ed. 3
D.Reynolds, S. C. P. 2002: A catalogue of alien plants in Ireland. – Glasnevin
E.Bolòs, O. de, Vigo Bonada, J., Masalles, R. M. & Ninot, J. M. 1990: Flora manual dels països catalans. – Barcelona
F.Castroviejo, S. 2013: Flora Iberica 20. – Madrid
G.anonymous 2010: Anthos. Information System of the plants of Spain. Real Jardín Botánico, CSIC - Fundación Biodiversidad – http://www.anthos.es/