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