Abstract: In present paper, the karyotypes and the centromeric terminalization value(T.C.%) of four species of the genus Primula from Mt.Wuliangshan, Yunnan Province are reported for first time: P.sinuata Franch.(2n=2x=22=20m(2SAT)+2st; T.C.%=57.51%), P.sinoexscapa C.M.Hu(2n=2x=22=20m+2sm; T.C.%=57.78%), P.denticulata ssp. sinodenticulata(Balf.F.et Forrest)W.W.Smith(2n=2x=22=20m(4SAT)+2st; T.C.%=56.79%)and P.interjacens var.epilosa C.M.Hu(2n=2x=18=2m(2SAT)+6sm(4SAT)+10st; T.C.%=67.47%). In addition, the probably original basic chromosome number of the genus Primula are discussed briefly.

Key words: Primula