The first known species of the family Equisetaceae, found in the Carboniferous of Europe, and the direct ancestor of the only extant genus Equisetum. See sphenopsida.
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。