云南楚雄州双子叶植物区系特征分析

云南省楚雄州自然分布(少数几种为栽培)的双子叶植物有2939种(含种以下单位)，隶属170科914属。本文对其区系成分进行了统计分析，结果表明双子叶植物科的分布类型主要是以热带——亚热带分布型(41科，占24．18％)和热带——温带分布型(31科，占18．24％)为主。属的分布类型主要以泛热带分布型(243属，占26．59％)、东亚分布型(112属，占12．25％)和北温带分布型(94属，占10．28％)为主。楚雄州双子叶植物区系特征有以下显著特点：①植物种类丰富；②区系成分复杂、起源广泛；③热带、亚热带成分突出。

Analysis of Characteristics of Dicotyledoneae Flora in Chuxiong of Yunnan Province

There are 2939 species (including taxon unit below species) of dicotyledoneae in the natural distribution of Chuxiong (the minority of them are cultivated), all the species are assigned to 170 familias, 914 genera. The analysis and statistics on the flora element show that the distribution patterns of the dicotyledoneae familia are mainly characterized by the pattern of tropical-subtropical distribution (41 familias,24 18%)and by the pattern of tropical-temperate distribution (31 familias,18 24%).The distribution patterns of genus are mainly characterized by the pantropical distribution (243 genera,26 59%)?the East-Asian distribution (112 genera,12 25%)and the north temperate distribution (94 genera,10 28%).There are obvious features of dicotyledoneae flora in Chuxiong, which including: plant species are plentiful; flora element originated complex and wide; tropical and subtropical elements are outstanding.