Clarkia Flowers (IMAGE) University of California - Santa Cruz Caption Close-up photos of Clarkia unguiculata and Clarkia cylindrica flowers show the two types of anthers, a conspicuous inner whorl and an outer whorl that blends in with the petals. Credit Kay et al., PRSB 2020 Usage Restrictions For use only with news coverage of this research License Licensed content 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.