Article

A population of Crepis pannonica, growing in the Hosrov reserve in Armenia, at the southem limit ofthe species' area, has been investigated over a period ofmore than 20 years. An extraordinary chromosomal polymorphism has been detected by the study ofroot tip mitoses ofseedlings. 40 different chromosome complement variants were found, including a full range of aneuploids, B-chromosomes, structural hetero- and homozygotes, witnessing active chromosomal restructuring and karyotype evolution.