Abstract: The karyotypes of twelve barrenwort species were studied by means of the cytological observation of root-tips. The results show that their karyotypes are similar to each other , with one pairs of middle satellite chromosomes and symmetric karyotype . Among them, the karyotype formulas of Epimedium sagittatum, E. myrianthum, E. acuminatum , E. wushanense, E. simplicifloum, E. yinjiangense, E. luodianense, E. davidi , E. pubigerum , E. franchetii and E. alpinum are 2n = 2x = 6m (2SAT ) + 6sm, and E. leptorrhizum 2n = 2x= 8m (2SAT ) + 4sm . Results of karyotypes analysis supported the opinion of the barrenwort is very conservative in evolution , Our karyotype study suggested that genus Epinedium should be the oldest group in the family of Berberidaceae .

Key words: Epimedium

摘要： 用细胞压片法对12 个淫羊藿属( Epimedium) 植物的根尖有丝分裂进行了观察, 并对其核型进行了比较研究。结果表明: 这12 种淫羊藿在核型上基本相似, 都有1 对中间随体染色体, 而且都为对称核型。粗毛淫羊藿( E. acuminatum) 、印江淫羊藿( E . yinjiangense )、单叶淫羊藿( E. simplicifloum) 、巫山淫羊藿( E. wushanense) 、光叶淫羊藿( E. myrianthum) 、宝兴淫羊藿( E. davidi) 、罗甸淫羊藿( E. luodianense) 、木鱼坪淫羊藿( E. franchetii ) 、箭叶淫羊藿( E. sagittatum) 、E. pubigerum、高山淫羊藿( E. alpinum) 等11 个种的核型公式均为2n = 2x= 6m (2SAT ) + 6sm, 而黔岭淫羊藿( E. leptorrhizum) 的核型公式为2n = 2x = 8m ( 2SAT ) + 4sm。结果显示12 种淫羊藿的体细胞染色体数目均为2n = 12 , 基数X = 6; 都属于对称核型、都有1 对中间随体; 染色体均为m、sm 两种类型。

关键词: 淫羊藿, 核型, 系统关系FONT