Hibiscus trionum flower (IMAGE) University of Cambridge Caption Striations start to form in the cuticle on the adaxial side of the proximal (purple) region of the Hibiscus trionum petal during early stages of bud development and are fully established by the time the flower is fully developed. Credit Image by Chiara A. Airoldi. Usage Restrictions Please only republish image when referencing this paper's research. License Original 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.