1. The basic haploid chromosome number in the genusTulipa is 12. Polyploid series occur in both the subsections Eriostemones and Leiostemones.
2. Although the diploid species probably reproduce sexually in the wild, the polyploids must be purely clonal since no aneuploids have been found.
3. Two main types of change have affected the chromosome morphology of the genus. Genotypic change of size and regulated structural change altering the position of the centromere have separated the genus into three groups with large, medium and small chromosomes. Random structural change has produced complements with reduplicated fragments (T. galatica) and with clearly unmated chromosomes (T. Gesneriana var. Zomerschoon).
4. Evidence from external and chromosome morphology, from intersterility and from the time at which meiosis occurs, points to the conclusion that the subgroupClusiana of the Leiostemones is as distinct from the other subgroups as it is from the Eriostemones.
Volume 101, 2022
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