Irisflorentin, a new isoflavone has been isolated from the rhizoma of Iris florentina L.(Iridaceae) besides irigenin, iristectorigenin B and irisolone. The structure of irisflorentinhas been determined as 5, 3', 4', 5'-tetramethoxy-6, 7-methylenedioxyisoflavone by chemical degradation and spectral means.
