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Abstract
We investigated the chromosome number and morphology of five Centaurea species belonging to five different Centaurea sections. All material analyzed was diploid with chromosome number 2n = 18 or 2n = 20. Chromosome number 2n = 18 was found for two populations (specimen a and specimen b) of Centaurea cassia Boiss., a rare species from Sect. Jacea (Mill.) DC., and two populations (specimen a and specimen b) of C. ptosimopappa Hayeka, a local endemic belonging to Sect. Ptosimopappus O. Hoffm. A chromosome number of 2n = 20, however, was observed for the other three Centaurea species: C. arifolia Boiss., a local endemic from Sect. Cynaroides Boiss. ex Walp., C. antochia Boiss. var. antochia, an endemic variety belonging to Sect. Acrocentron (Cass.) DC., and C. hyalolepis Boiss. from Sect. Calcitrapa DC. The chromosome number for the latter species represents the first record for Hatay province. Differences in chromosome size and karyotype are described.
Acknowledgements
We thank the Scientific Investigation Project Coordinator of Istanbul University (project no: 22822) for their financial support. This study was part of Mehmet Bona's master's thesis research under guidance of advisor Associate Professor Aliye Aras Perk from the Faculty of Science at Istanbul University. We are grateful to Professor Dr Neriman Özhatay for many valuable suggestions regarding the manuscript. We also thank Margaret Johnson for improving the text.