Abstract: The somatic chromosome numbers of two species of Adoxaceae from north-east of China are reported in this paper. Adoxa orientalis Nepomn. (from Daxinganling Heilongjiang province)2n= 108; Adoxa moschatellina L. (from Antu Jilin province and Xifong Liaoning prov-ince)2n»36? Adffxa moschatellina L. (from Shangzi Heilongjiang province) 2n= 54. Among them, the chromosome numbers of Adoxa orientalis are reported for the frist time. It shows the maxi-mum number in Adoxaceae according to the data have reported before. Cytological evidens may not support that the Adwa orientalis is the primary group in Adoxaceae.

Key words: Adoxaceae

摘要： 中国东北分布的两种五福花科植物的染色体进行了观察，结果如下：1.东方五福花Adoxa orientalis Nepomn．体细胞染色体数为2n=108，是五福花科植物中目前已知染色体数目最多，倍性最高的一个种。此系该种自1984年发表以来第一次报道其染色体数目。2.五福花Adoxa moschatellina L.体细胞染色体数目在东北不同地区采集的材料有所不同。辽宁省西丰县和吉林省安图县产的材料为2n=36，黑龙江省尚志县产的材料为2n=54。以上结果表明东方五福花在五福花科系统演化中处于较同属植物五福花更为进化的水平。文章还根据现已发表的细胞学资料初步讨论了五福花科的系统关系。

关键词: 五福花科, 东方五福花, 五福花, 染色体数目