Abstract: The biosystematic relationships among Roegneria kamoji Ohwi, R. ciliaris (Trin.) Nevski and R. japonensis (Honda) Keng in the tribe Triticeae Dumortier were studied in the present paper by the methods of morpho-logical comparison and karyotype analysis. Morphologically, R. kamoji was quite different from the other two species, i. e. R. ciliaris and R. japonensis. But there was very slight disparity between the latter two species. Therefore, the classification of the two species was very difficult. Cytologically, the karyotype formulae of the three species were as follows:R. kamoji, 2n = 6x = 42 = 30m+8sm +4SAT;R. ciliaris, 2n = 4x =28 = 18m + 6sm+ 4SAT; R. japonensis, 2n=4x=28 = 18m+6sm+4SAT. The karyotype of R. ciliaris and R. japonensis showed non-significant difference from the analysis of t-test, while the karyotype of R. kamoji was substantially different from those of the other two species. Based on above-mentioned results, the authors suggest R. ciliaris and R. japonensis be combined into one species.

Key words: Triticeae； Roegneria

摘要： 本文通过对鹅观草属的三个种:鹅观草(Poegneria kamoji Ohwi)、纤毛形观草(R.ciliaris (Trin.)Nevski) 和坚立鹅观草(R.japonensis(Honda)Keng)的形态学比较和核型分析研究了该三个种的系统关系。R.kamoji与R.ciliaris、R. japonensis形态上的差异明显，而后二个种差异甚小,难以进行划分。R．kamoji的核型公式为:2n=6x=42=30m+8sm+4SAT;R.ciliaris为:2n=4x=28=18m+6sm+4SAT;R.japonensis为:2n=4x=28=18m+6sm+4SAT。t-测验的结果表明R.ciliaris与R.japonensis的核型无显著差异。因此笔者认为R.ciliaris 和R.iaponensis应合并为一种系内的分类群。

关键词: 小麦族, 鹅观草属, 鹅观草, 纤毛鹅观草, 竖立鹅观草, 形态变异, 核型