Source: Raab-Straube, E. von & Henning, T. (2018+): Violaceae. – In: Euro+Med Plantbase - the information resource for Euro-Mediterranean plant diversity.
Euro+MedendemicA: Belgium, with LuxembourgnativeB; France, with Channel is. and Monaco (FrancenativeA,B,C); GermanynativeB; Great BritainnativeB; Ireland, with N IrelandnativeB; NetherlandsnativeB; Spain, with Gibraltar and AndorranativeB; SwitzerlandnativeB
Bibliography
A.Guinochet, M. & Vilmorin, R. de 1982: Flore de France 4. – 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.Tison, J.-M. & de Foucault, B. 2014: Flora Gallica. – Mèze: Biotope