【摘要】 德宏地区野生种子植物共记录有 2 2 7科 ,1 43 2属 ,493 7种。按种数以禾本科 (2 69种 ) ,菊科 (2 67种 ) ,兰科 (2 5 9种 ) ,蝶形花科 (2 2 9种 ) ,茜草科 (1 66种 ) ,蔷薇科 (1 5 3种 ) ,大戟科 (1 1 0种 ) ,樟科 (1 0 1种 ) ,莎草科 (97种 ) ,荨麻科 (90种 ) ,桑科 (89种 ) ,爵床科 (77种 )等为优势科。在属的分布区类型构成上 ,以热带亚洲成分为最多 ,占总属数的 2 5 .1 % ,其次是泛热带成分 ,占总属数的 1 8.4% ,旧世界热带成分占 1 0 .3 % ,北温带成分占 1 1 .6% ,东亚成分占 9.2 % ,中国特有成分占 1 .8%。所有热带成分合计共 92 5属 ,占总属数的 68.2 % ,构成该植物区系的主体 ,温带成分 (类型 8～ 1 4)共有 40 6属 ,约占总属数的 3 0 % ,故认为该植物区系仍属于热带性质的植物区系 ,受热带亚洲植物区系的渗透和强烈影响 ,在世界植物区系分区上属于古热带植物区 ,马来西亚亚区 (热带亚洲植物区系区 )中的滇—缅—泰地区。更多还原

【Abstract】 The flora of Dehong region,SW Yunnan,is recorded to consist of 4 937 native seed plant species belonging to 1 432 genera and 227 families,of which the family Gramineae with 269 species is the largest family in size;Compositae with 267 species is the second;Ochidaceae with 259 species is the third;and other families are ranked as following:Papilionaceae(229 species),Rubiaceae(166),Rosaceae(153),Euphorbiaceae(110),Lauraceae(101),Cyperaceae(97),Urticaceae(90),Moraceae(89)and Acanthaceae(77). The statistics of distribution patterns of genera shows that the genera of tropical distribution make up 68.2% of the total sum of the flora,while the genera of temperate distribution contribute 30%. Furthermore,the genera of tropical Asian distribution contribute 25.1% of the total sum of the genera,which represents strong affinity to tropical Asian flora. It is confirmed that the flora of Dehong region is of the tropics in nature and as a part of the tropical Asian flora. Occurred at the northern margin of tropical Asia,the flora also shows conspicuous characters of the tropical margin and is the transitional to the subtropical flora of SW China.更多还原