Model Oblique (image) University of Vienna Share Print E-Mail Caption The ancestral flower was bisexual with multiple whorls (concentric cycles) of petal-like organs, in sets of threes. Credit Copyright: Hervé Sauquet/Jürg Schönenberger Usage Restrictions The image may only be used with appropriate caption or credit. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.