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© 2018 The Japan Mendel Society Cytologia 83(4): 407–414 Karyological Investigation of Sixteen Cirsium Mill. (Asteraceae, Cardueae) Taxa from Turkey Yasar Kiran* Firat University, Science Faculty, Biology Department, Elazig, Turkey Received June 27, 2018; accepted July 18, 2018 Summary The chromosome number and karyotype analysis of sixteen taxa of genus Cirsium Mill. distributed in Turkey were analyzed. This taxa are, Cirsium steriolepis Petr., C. bulgaricum DC., C. polycephalum DC., C. trachylepis Boiss., C. sommieri Petr., C. osseticum (Adams) Petrak, C. leucocephalum (Willd.) Spreng ssp. tenuilobum (K. Koch) Greuter, C. haussknechtii Boiss., C. ekimianum Yildiz & Dirmenci, C. handaniae Yildiz, Dirmenci & Arabacı, C. davisianum Kit Tan & Sorger, C. hypoleucum DC., C. pseudopersonata Boiss & Bal. ssp. pseudopersonata, C. pseudopersonata Boiss. & Bal. ssp. kuznezowianum (Somm. & Lev.) Petrak, C. canum (L.) All., C. obvallatum (Bieb.) Fischer, and nine of them are endemic species (C. steriolepis, C. polycephalum, C. trachylepis, C. sommieri, C. leucocephalum ssp. tenuilobum, C. davisianum, C. handaniae, C. ekimianum and C. pseudopersonata ssp. pseudopersonata). The somatic chromosome number of all studied taxa were deter- meined as 2n=2x=34. Total chromosome lengths varied 68.00 to 147.92 µm among species. Karyotype asymme- try indices other parameters were also calculated. Karyotype analysis indicated that Cirsium taxa generally have median (m and M) chromosomes. In addition, only C. davisianum species has one submedian (sm) chromosome. The chromosome number and karyotype of C. polycephalum, C. handaniae, C. davisianum and C. ekimianum are newly reported. Key words Asteraceae, Cirsium, Karyotype, Chromosome number, Turkey. The genus Cirsium Mill. (thistle) of the family Astera- 102 are either very rare or doubtful (Bures et al.
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