Karyotypes of white flower and purple flower type of Allium wallichii from Changchong mountain were examined.The results showed that both types were tetraploid and the karyotypes types were 2A.The karyotype formula of white flower type was 2n=4×=28=8m(2sat)+20sm,T.C.% was 63.65%;The karyotype formula of purple type was 2n=4×=28=10m(2sat)+16sm+2st,T.C.% was 64.35%.Comparative analysis on cytological characteristics showed the decline of karyotype asymmetry,which suggested the white flower type was the ancest...