秦岭石瓮种子植物区系研究

石瓮地处秦岭南坡柞水县境内，共有野生种子１１３科，４２１属，８１３种。通过对该区种子植物的科、属、种分析统计，归纳该区种子植物区系特点如下：１）植物种类较为丰富；２）地进成分复杂，分布类型多样，区域联系广泛，与世界各大洲有密切的联系；３）区系起源古老；４）区系性质明显是温带性，且以北温带成分为主，区系过渡性明显；５）本区植物区系８０．４４％的成分与华中植物区系共有，具有华中植物区系特征。

Studies on the Flora of Seed Plants of Shiweng in Qinling

Shiweng is located on the Zhashui County of the Southern slope of Qinling, There are 813 species of wild seed plants belonging to 113 families and 421 genera in Shiweng. Based on the analysis of families, genera and species, the characteristics of flora are summaried as follows: 1) The seed plants species are rich; 2) The geographical elements are complex, and the types of distribution are varieties. The floristic elements are wide connection with flora of the world; 3) The origin of the flora is very ancient; 4) The flora has an obvious character of temperate zone, and the northern temperate elements have a dominant position. the flora show more transitional; 5) This region is the closest to the floristic region of Central China. Hence, the flora of Shiweng should belong to the Flora of Central China.