【摘要】 分析了美国扁柏、日本扁柏和日本花柏的核型，它们的核型公式分别为Ｋ（２ｎ）＝２２＝２２ｍ，２０ｍ＋２ｓｍ和１４ｍ＋８ｓｍ。作者比较了扁柏属６个代表种的核型，发现北美种类有比东亚种类原始的趋势。在柏本亚科中，扁柏属可能最进化，柏木属最原始，福建柏属和杂交属×Ｃｕｐｒｅｓｓｏｃｙｐｅｒｉｓ居中。论文还讨论了柏木和福建柏的系统位置。更多还原

【Abstract】 The present paper deals with the karyotype analyses of Chamaecyparis lawsoniana. Ch.obtusa and Ch. Pisifera. The karyotype formulas of the species are K(2n)= 22= 22m, 20m+2sm and 14m+8sm respectively. After making comparison among the karyotypes of 6 representative species in Chumaecyparis with related data of geography and fossil, the authors think that the species lived in North America might be more primitive than that in East-Asian. In the Cupressoideae Chamaecyparis may be the most advanced one, Cupressus the most primitive and Fokienia and× Cupressocyparis may be the intermediate taxa. The evolutionary positions of Cupressus funebris and Fokienia hodginsii are also discussed in the paper.更多还原