Karyotypes of Five Species in Ranunculus

The karyotypes of five species of genus Ranunculus in Yunnan province of China were analysed.In Sect.Ranunculus,the karyotype formulas of Ranunculus chinensis Bunge and R.cantoniensis DC.were 2n=2x=16=6m+4sm+6st and 2n=4x=32=14m+6sm+12st.The asymmetrical karyotype coefficient of R.chinensis,R.cantoniensis and R.sieboldii Miq.,gradually increased in different population from west to east in China.In Sect.Auricomus,the karyotypes(2n=4x=32=12m+12sm+8st) of R.pulchellus var.stracheyanus Hand.-Mazz.in Zhongdian population was obviously different from that in Qinghai population(2n=4x=32=24m+8sm).The chromosome numbers and karyotypes(2n=40,2n=5x=40=30m+10sm)of R.tangusticus var.dasycarpus(Maxim.)L.Liou and that(2n=40,2n=5x=40=20m+16sm+4st) of R.napahaiensis W.T.Wang & L.Liao are reported for the first time.