Poplar Measurements (IMAGE) Oregon State University Caption Measurements being collected on a representative tree at the Arizona plantation, June 2013. Credit Photo by D.J.P. Moore (University of Arizona). Usage Restrictions None 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.