云南热带种子植物区系

A FLORISTIC STUDY ON THE SEED PLANTS FROM TROPICAL YUNNAN

云南热带是指云南东南、南及西南的沿边热带地区，其地理范围在现令热带雨林及热带季雨林分布的区域。其种子植物区系有４９１５种，隶属于１４４７属和２４８科，基本上是热带北缘性质但同时明显表现出向亚热带过渡的特点。经分析，云南热带东西两侧的地理联系、替代现象、特有现象和区系起源和演化上有很大差异，其原因可能有不同地史背景。因此，将云南热带东西两侧划分为古热带植物区中两个不同的植物区系地区是合理的，但其范围和分布界应按《云南省植被区划图》（吴、朱，１９８７）所标出。

Tropical Yunnan is the tropical border area of SE,S & SW Yunnan. This area is the range of tropical rain forests and tropical monsoon forests in Yunnan province now. Its seed plant's flora has 4915 species in 1447 genera and 248 familles.It is basically tropical in nature but has some obvious transitional characteristics from tropical to subtropical floras, so that it is best to be said as a north variant oftropical flora.After analysing its florlstic elements,the eastern part and western part of tropical Yunnan have many differences in the geographical relationship.vicariance,endemism,as well as floristic origin and differentiation.The cause of these differences may be due to their different geological background. So that it is reasonable to divide these two parts of tropical Yunnan into different regions of palaeotropical kingdom. but the range and boundary of these two floristic regions should be based on the map of idealized vegetation of Yunnan(Wu & Chu,1987).