Chromosome numbers and of the two Cyccls species from China are all 2n=2x=22, and the karyotypes are classified to be 3B according to stebbin＇s category. The karyotype formulas are 2n=2x=22=4m＋2sm＋4st＋12T for C. hainanensis, and 2n=2x=22=2m＋4sm＋4st＋12T for C. szechuanensis subsp.fairylakea. The two karyotypes are reported for the first time. The results support that Cycas can be divided into two groups based on the chromosome data.
覃广泉； 刘念.两种国产苏铁属植物的核型分析[J].热带亚热带植物学报,2005,13(6):511~515
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