Abstract
1. The haploid chromosome number in Monarda fistulosa, M. didyma, and Nepeta cataria is sixteen, in M. punctata twelve. 2. In M. fistulosa one pair of satellite chromosomes is commonly in contact with the nucleolus at synizesis, the open spireme stages, diakinesis, and interkinesis. A second pair of satellite chromosomes is free of the nucleolus in diakinesis and interkinesis. 3. Two pairs of satellite chromosomes are present in M. didyma and N. cataria. One pair is attached to the nucleolus, the other pair free, at diakinesis and interkinesis. 4. Only one pair of satellite chromosomes was observed in the nuclei of M. punctata at diakinesis. It is attached to the nucleolus.
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