Leaf of Grass (image) Brown University Share Print E-Mail Caption In this magnified cross-section of a leaf of Eriachne ciliata grass, scientists note that the circle-shaped veins are relatively close and are ringed by large "bundle sheath" cells. That anatomy promotes a more efficient "C4" means of photosythesis. Credit Courtesy Edwards Lab/Brown University Usage Restrictions With 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.