Abstract
The authors have observed the chromosome numbers of Mexican Tea (Chenopodium ambrosioides L.) and American Wormseed (Chenopodium ambrosioides L. var. anthelminticum A. Gray), together with some other species of Chenopodium.
Results obtained are summarized as follows:
1. The authors have determined for the first time that, the chromosome numbers of Mexican Tea are n=8, 16, and 24, and that of American Wormseed is n=32.
2. It has been shown for the first time that the basic number of Mexican Tea and American Wormseed is 8.
3. Diploid (n=8), tetraploid (n=16) and hexaploid (n=24) plants of Mexican Tea, and American Wormseed (n=32) have morphologically each different characteristic features.
4. Chromosome numbers of some other species of Chenopodium observed by the authors are shown in Table 2, and it has been shown for the first time that their basic number is 8.
