在秦岭种子植物区系中有 34种国家二类和三类珍稀濒危保护植物 ,其中濒危 2种、稀有 17种、渐危 15种。地理成分分析表明 ,在属一级水平上以北温带成分、中国特有成分及东亚成分为主 ,种一级水平上以华中区系成分为主。野外调查发现其中 2种分布于秦岭北坡 ,7种见于秦岭南坡 ,其余 2 5种广布于秦岭南北坡 ;珍稀濒危植物的垂直分布多集中于海拔 10 0 0～ 2 0 0 0m之间。

There are 34 species of national key preserving plants in seed plant flora of Qinling Mt .These
plants are divided into three types , such as 2 endangered species , 17 rare species and 15 vulnerable species .The geographical compositions of the rare and endangered plants are studied .The result shows that the north temperate element , China endemic element and East Asia element are the major geographical compositions at genus level .The geographical compositions of species takes Central China as the dominant element .The result of the field investigation shows that 2 species distribute in the north slope , 7 species in the south slope , and other 25 species at Qinling Mt .widely .The vertical distribution of these species is mostly in range of the elevation 1 000 -2 000 m .