2010.05.03 Austria, Vienna XI. district/ Lower Austria, district Schwechat (brownlands near rail hub, 168 m AMSL).Flowering from may till october.Very common (origin: Asia, but is native in Central Europe for centuries already).German name: SchllkrautID: 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/303604