2010.05.09 Austria, Upper Austria, district Rohrbach/O (fresh meadow, 695 m AMSL).Flowering from april till june.Typically flowers are of a light violet colour; in this meadow (and in this region, at that) however they're all white like this one.Very common.German name: Wiesen-SchaumkrautID: Fischer & al., Exkursionsflora (2008 3rd)
Kohler's Medizinal-Pflanzen in naturgetreuen Abbildungen mit kurz erlauterndem Texte :.Gera-Untermhaus :Fr. Eugen Kohler,[1883-1914].biodiversitylibrary.org/page/303578