Poplar Plantation near Boardman, OR (IMAGE) DOE/Joint Genome Institute Caption Hybrid poplar trees growing in Greenwood Resources plantations near Boardman, OR are shown. These trees have the highest annual productivity of any hardwood species in North America. The research described here is aimed at developing molecular markers to customize poplar for bioenergy production. Credit DOE JGI 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.