Iris germanica cv. Sans Souci
Sans Souci is a cultivar of Iris germanica. "Variegata with bright yellow standards over falls washed mahogany red. Distinguished from Honorabile by the color not being solid on the falls. Intensity of color varies year to year seemingly dependent on weather." https://www.historiciris.org/listings/sans-souci/
''Iris germanica'', the German Iris, is a species in the genus iris. The Iris Germanica grows up to 90 cm high and 10 cm wide. The roots can go up to 10 cm deep. It is an outdoors plant that blooms most in May-August, but planting it would be best in February-April.''. It is a European hybrid, rather than a true wild species. ''I. germanica'' is known to produce the isoflavone irilone.