The plant species diversity in southern Tibetan Plateau

目的：探讨青藏高原南缘高等植物的多样性及其系统发育关系。1998年，我们考察了位于高原最南端的尼泊尔东部的阿伦河地区，以及位于高原最东缘的中国横断山脉。在尼泊尔，研究主要集中在以下属：风毛菊属、绿绒蒿属、虎耳草属、马先蒿属和杜鹃属。1)本研究收集的材料可用于野外细胞分类学研究、形态学研究、种群多样性研究、分子系统发育研究和垂直分布研究.在中国，研究主要集中在以下属：委陵菜属、灯心草属、绿绒蒿属、虎耳草属、马先蒿属，在尼泊尔也进行了研究。本研究结果表明：1）委陵菜属植物有24种10变种，其中多叶委陵菜为一新种; 2）灯心草属植物有2新种，即灯心草属（Juncus gunggae）和川滇灯心草属（J.tradiphyllus）; 3）虎耳草属植物在本地区有一定的分布。在实地调研之后，对收集到的资料进行分析.作为结论，发表了一份报告。

This research aimed to clarify the diversity and phylogenetic relationship of the higher plants distributed in southern margin of the Tibetan Plateau. In 1998 we surveyed the Arun River Region in eastern Nepal situated in the southernmost margin of the Plateau, and also the Hengduan Mountains in China situated in the easternmost margin of the Plateau.1. In Nepal the research is focused on the following genera, Saussurea, Meconopsis, Saxifraga, Pedicularis and Rhododendron. 1) We collected the materials for cytotaxonomical studies in the field, 2) for morphological studies, 3) for population diversity, 4) for molecular phylogenetic studies, and 5) for the vertical distribution comparing with the related taxa.2. In China the research is focused on the following genera, Potentilla, Juncus, Meconopsis, Saxifraga, Pedicularis, as done in Nepal. As the results of this research we have clarified and implemented the followings ; 1) for Potentilla it is confirmed that 24 species and 10 varieties are distributed in this region, one of which is a new species, Potentilla polyphylloides, 2) two new species are found in Juncus, Juncus gunggae and J.tradiphyllus, 3) for Saxifraga an enumeration of this region is published.3. After the field research the collected materials are analyzed.4. As a conclusion a report is published.