Abstract
The details of a cytogenetic study on 8 taxa of the mediterranean genus Anacyclus are presented. The results include information of the gross morphology, pollen fertilities and meiotic pairing behaviour of F1 hybrids supplemented by data on the karyotype morphology and DNA contents of parenthal plants. The results indicate that evolution in the genus has been accompanied by chromosomal repatterning. There are three distinctive groups within the experimental taxa, a pair of closely related perennials and two groups of annuals. There is considerable genome homology within each group but major differences between them. The groups are discussed in terms of their systematic relationships with other members of the genus in an effort to provide an explicit evolutionary model for the origin of different taxa. The understanding of the relationships of the annual taxa is complicated by sympatry and the occurrence of natural hybrids.
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