On Plants with Almost Regular Meiosis I

抄録

1. The events of microsporogenesis in Heuchera americana L., n-7, are presented as characteristic of a group of higher plants whose reduction divisions still retain traces of previous hybridization of the species.
2. Comparison is made between such meiotic irregularities as are found in H. americana and various types of sex chromosomes, to the discredit of the latter.