四川被子植物区系特征的初步研究

四川地区被子植物区系188科1493属8711种及1252变种，全球50％以上的科都有代表，与毗邻地区及世界植物区系有着广泛而密切的联系。区系古老而原始，珍稀孑遗类群丰富；单型或少种的科属众多，含100种以上的大科和大属也十分繁荣；含5种以下的属占76.89%,但占总属数约22.64%的多种属和大属是区系的主体，包含区系总种数的63.28%。科的分布类型有明显热带性质，属、种的分布类型反映出典型的亚热带属性。优势现象明显，特有类群和表征类群丰富。该地区被子植物区系对中国乃至东亚都有代表性。

A Preliminary Study on the Characteristics of Angiosperm Flora in Sichuan Region

There are 188 families, 1493 genera, 8711 species and 1252 varieties in Angiosperm flora of Sichuan region, including more than 50% of families in the world, and contacting with its adjacent area flora and the global flora widely and intimately. The richness of relict and endemic compositions shows that the Angiosperm flora in Sichuan is old and primitive. The monotypic or oligotypic families and genera are much abundant in the region meanwhile the families and genera containing more than 100 species are very luxuriant in its flora also. Although the genera with less than 5 species are about 73.80% the genera with 6-99 species, which is about 22.64% of the total genera in the flora are the main composition. The areal-types of families are mainly tropical, but those of genera and species reflect a typically subtropical characteristics. The Angiosperm flora in Sichuan region is characterized by not only obvious dominance pheneomena but also abundant endemic and characteric taxa. It is a representativeness to the ones of China and East- Asia.