Extinct gymnosperm order ranging from the Triassic into the Cretaceous. They resembled cycads, and possessed reproductive structures which must have looked more like flowers than cones.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。