1.苏铁植物门类在中生代,裸子植物达到繁盛的顶峰期,其中苏铁类植物(Cycadophyta)广泛分布全球,最具代表性,成为恐龙森林的主要的构建者,中生代又被称为“苏铁植物时代”。苏铁植物包含有苏铁纲(Cycadopsida)和本内苏铁纲(Bennettitopsida)。苏铁纲植物虽在侏罗纪和早白垩世极为繁盛,分布遍及全球,但现今已处于次要地位(图1),仅存留10属近180种,分布于热带、亚热带地区,很多种类被广泛用于园林绿化及作为庭院植物。本内苏铁则常见于晚三叠世至早白垩世植物群, 1. Cycas Phyllostachys In the Mesozoic, gymnosperms peaked at their peak, with Cycadophyta being the most widely distributed and representative of the world and becoming the major builder of dinosaur forests. Mesozoic is also known as the “Cycas era”. Cycadopsida contains Cycadopsida and Bennettitopsida. Although the Jurassic and Early Cretaceous plants in the Jurassic and Early Cretaceous are extremely prosperous and distributed throughout the world, the plants of the Cyclobalanopsis series are now in a secondary position (Figure 1), with only 10 genera and nearly 180 species remaining in the tropics and subtropics. Many species are widespread For landscaping and as a garden plant. Ben Nei Su is common in the Late Triassic to Early Cretaceous flora,