Abstract: Karyotypes of 5 populations to Allium robustum，A. fetisowii and A. roborowskianum
originated from Xinjiang were analyzed by squash method. The result showed that the chromosome
numbers of A. fetisowii were 2n = 2x = 20 and 2n = 3x = 30，and its karyotype was 2B. The chromosome
numbers of A. robustum and A. roborowskianum were 2n = 2x = 16 respectively，and their karyotype was
all 2A. The karyotype formular of A. fetisowii in Yumin-Tacheng population was K（2n）= 2x = 20 = 12m +
7sm + 1st. The karyotype formular of A. fetisowii in Yumin population were K（2n）= 2x = 20 = 12m + 6sm
+ 2st and K（2n）= 3x = 30 = 18m + 6sm + 6st. The karyotype formular of A. roborowskianum in
Yumi-Tacheng and Qitai populations were K（2n）= 2x = 16 = 12m + 4sm，and the karyotype formular of
A. robustum was K（2n）= 2x = 16 = 14m + 2sm. Satellite appeared on the short arm in m chromosome of
A. robustum and sm chromosome of A. roborowskianum in Qitai population. The compositions of
chromosome relative length were different in different species. A. fetisowii had all 4 kinds of chromosomes
based on the index of relative length，A. roborowskianum missed L and S chromosome，and A. robustum had no L chromosome. A. fetisowii has intraspecific ploidy differentiation，and its triploid is reported for the first time.

Key words: Allium, A. robustum, A. fetisowii, A. roborowskianum, karyotype, diploid, triploid