Tree Rings (IMAGE) Harvard University Caption A leaf and flower of tulip-poplar (Liriodendron tulipifera), the tallest documented tree in the eastern US. Fast-growing and productive, this species is important for both forest products and the carbon cycle. Credit Neil Pederson 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.