中文摘要：

研究的植物化石采自内蒙古乌达地区早二叠世地层,共计11属20种,分属于石松纲、楔叶纲、瓢叶目、真蕨纲、种子蕨纲和苏铁纲。研究结果表明,植物群含有许多华夏植物群分子和地方性分子,为典型的华夏植物群。根据植物群分子的总体组成,植物群的时代为早二叠世,相当于阿瑟尔期（Asselian）、萨克马尔期（Sakmarian）、亚丁斯克期（Artinskian）和空谷期（Kungurian）。在研究植物群的基础上,对植物群的古生态进行了研究,建立了早二叠世Lepidoden-dron posthumii-Paratingia datongensis植物群落。这一植物群落在二叠纪主要分布在沼泽和低地环境,以大量出现的蕨类和种子蕨分子为特征。植物群落为原地保存,借助于化石资料,植物的生活型得以重建,包括乔木、树蕨、灌木和草本。植物群落指示早二叠世本区为温暖潮湿的气候条件。

英文摘要：

The fossil plants studied in this paper were collected from the Early Permian strata in the Wuda area of Inner Mongolia,China.This flora is composed of 20 species in 11 genera and they belong to Lycopsida,Sphenopsida,Noeggerathiales,Filices,Pteridospermopsida and Cycadopsida.The result shows that the flora contains many typical Cathaysian elements and endemic species and it is a typical Cathaysia flora.On the basis of the floral components,the geological age of the flora is equivalent to the Early Permian,corresponding approximately to Asselian,Sakmarian,Artinskian and Kungurian.Based on the studies of the flora,floral palaeoecology is studied in the paper and the Lepidodendron posthumii-Paratingia datongensi community can be set up in the area.The plant community,which was the most abundant in the swamp and lowland environments during the Early Permian,was characterized by the largest number elements of ferns and pteridosperms.The plant community is preserved autochthonously and the life forms of vegetation can be reconstructed by means of fossil materials,including arbores,tree ferns,shrubs and herbs.The plant community indicated a warm and humid climatic condition in the area during the Early Permian.