Abstract
1) Chromosome numbers of the genus Chenopodium observed by the authers during the period of 1950 to 1952 are shown in Table 1, and it has been shown for the first time that the basic numbers are 8 and 9.
2) Mixoploidy was found in the root tip cells of Ch. murale L. (2n=18) and Ch. vulvaria L. (2n=18). Only in the periblem, 2n (18) and 4n (36) numbers were found in Ch. murale; 2n (18) and 6n (54) numbers in Ch. vulvaria. The size of cells of 4n and 6n numbers is larger than that of 2n numbers.
