Abstract: In the present paper, karyological studies were carried out in five species of Subgen. Palladia ( Lysimachia) from China, of which the chromosome numbers and the karyotypes of the four species are first re-ported, which are: Lysimachia glanduliflora Hanelt 2n = 24 = 12m + 8sm + 4st(2SAT), Lysimachia heteroge-nea Klatt 2n = 22 = 2m + 4sm + 6st + lOt, Lysimachia Candida Lindl. 2n = 24 = 14m + 6sm(2SAT) + 4at and Lysimachia parvifolia Franch. 2n = 48 = 34m + lOsm + 4st. The karyotype of Lysimachia fortunei Maxim from Jiujiang of China (2n = 24 = 20m + 4sm(2SAT) ) is somewhat different from that from Japan (2n = 24 = 18m (1SAT) + 6sm(SAT)) . The four sections with nine species in the Subgen. Palladia ( Lysimachia) were also cytologically analysed in the paper. The result shows that in the four sections, Sect. Spicatae has the most sym-metrical karyotype. Sect. Lubinia has the most asymmetrical karyotype ,and Sect.Candidae is between the fomer two sections, but Sect. Miltandrae has various kinds of the karyotypes including the former three sections.

Key words: Lysimachia, Karyotype

摘要： 本文对5种珍珠菜亚属植物进行了染色体数目及核型研究。其中隧瓣珍珠菜2n＝24＝12m＋8sm＋4st（2SAT）、黑腺珍珠菜 2n＝22＝2m＋4sm＋6st＋10t、泽珍珠菜 2n= 24＝14m＋6sm（2SAT）＋4st和小叶珍珠菜 2n=48＝34m＋10sm＋4st的染色体数目及核型为首次报道。中国九江产的红根草核型2n＝24＝20m＋4sm（2SAT）与日本产的核型2n＝24＝18m（1SAT）＋6sm（1SAT）有所不同。本文还分析了珍珠菜亚属4组9种植物的核型。其结果表明在4个组中，穗花组核型最为对称，海滨组核型最不对称，湿生组介于前两者之间，而腺药组具有前3组的各种类型。

关键词: 珍珠菜属, 核型