Climate-altering Plant Physiology (IMAGE) University of Chicago Caption The vein density of flowering plants is four times higher than any other plant type, either modern or extinct. The difference in vein density is easily seen in this image of a fern leaf lying atop the leaf of a flowering plant. Credit C. Kevin Boyce Usage Restrictions This image may be used by news organizations reporting the research findings of C. Kevin Boyce and Jung-Eun Lee. 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.