Cyanella hyacinthoides This plant is native to South Africa. See WikipediaFred found it growing near a wetland in brown sandy soil. It is known in a few locations and is thought to be a garden escape. Photo: Fred
Sisyrinchium vaginatum Spreng. IRIDACEAELocal: Lago Sul, Braslia, Brasil.Ref.: Dias, E.B.A. & Cavalcanti, T.B. Iridaceae. In. Cavalcanti, T.B. e Batista, M.F. Flora do Distrito Federal, Vol. 8. Embrapa, 2010.
2012-05-13 Vienna XXII. district, Lobau - Danube National ParkGerman name: Sibirien-Schwertlilie, Wiesen-SchwertlilieThis very rare Iris species is not native to this habitat (and possibly not to Lobau at all); anyway, here on this place I never saw any, so it is safe to assume that somebody seeded them here on purpose.