Iris Chamaeiris lati folia tota alba, Iris Dalmatica fl caeruleo, Iris maiorfrancia, Gerulea lineis ornate (1719) by Michael Valentini taken from Viridarium Reformatum, seu Regnum Vegetabile: Krauter Buch (Newly Revised Garden of the Plant Kingdom: Herb Book), Michael Bernhard Valentini (1657-1729) editor. Frankfurt, Anton Heinscheidt, 1719. Source - theantiquarium.com
This is a painting of the most expensive tulip ever sold, 13000 florins in 15th ce. Netherlands. That amount would have bought a large house and a tract of land! The unusual stripping is responsible for the Tulip speculation of the 15th century and a virus was responsible for the coloring!