Grass leaf mystery solved (IMAGE) John Innes Centre Caption Developing Maize Plant – a staple crop and member of the grass family. A new study explains how the grass leaf evolved. Credit Annis Richardson Usage Restrictions No restrictions. License Public Domain 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.