his cytological study was performed in 19 taxa grown naturally in Nizip region (Aksaray). These taxa are Conringia perfoliata (.) Busch, Alyssum strigosum Banks & Sol. subsp. strigosum, Alyssum murale Waldst. & Kit. subsp. murale var. murale. | Turk J Biol 33 (2009) 35-44 © TÜBİTAK doi: A Cytogenetical Study on Some Plants Taxa in Nizip Region (Aksaray, Turkey) Meryem ÖZTÜRK, Esra MARTİN, Muhittin DİNÇ, Ahmet DURAN, Ayşe ÖZDEMİR, Özlem ÇETİN Selçuk University, Ahmet Keleşoğlu Faculty of Education, Department of Biology, Konya - TURKEY Received: Abstract: This cytological study was performed in 19 taxa grown naturally in Nizip region (Aksaray). These taxa are Conringia perfoliata (.) Busch, Alyssum strigosum Banks & Sol. subsp. strigosum, Alyssum murale Waldst. & Kit. subsp. murale var. murale, Matthiola longipetala (Vent.) DC. subsp. bicornis (Sibth. & Sm.) ., Erysimum thyrsoideum Boiss. subsp. thyrsoideum (Brassicaceae), Silene alba (Mill.) . Krause subsp. divaricata (Reichb.) Walters, Silene conoidea L., Silene otites (L.) Wibel. (Caryophyllaceae), Linum austriacum L. subsp. austriacum (Linaceae), Medicago × varia Martyn., Onobrychis argyrea Boiss. subsp. argyrea (Fabaceae), Astrodaucus orientalis (L.) Drude (Apiaceae), Centaurea patula DC., Centaurea solstitialis L. subsp. solstitialis, Cnicus benedictus L. var. benedictus, Tragopogon longirostris Bisch. ex . var. longirostris (Asteraceae), Paracaryum ancyritanum Boiss., (Boraginaceae), Plantago major L. subsp. intermedia (Gilib.) Lange, Plantago lanceolata L. (Plantaginaceae), Erysimum thyrsoideum subsp. thyrsoideum, Paracaryum ancyritanum, and Onobrychis argyrea subsp. argyrea. Somatic metaphase chromosome numbers of Paracaryum ancyritanum, Onobrychis argyrea subsp. argyrea, Erysimum thyrsoideum subsp. thyrsoideum, and Alyssum murale subsp. murale var. murale were determined for the first time. Moreover, karyotype analyses of Cnicus benedictus var. benedictus, Matthiola longipetala subsp. bicornis and Medicago × varia were carried out for the first time in the present study. Key Words: Aksaray, chromosome number, karyotype, endemic, Turkey Nizip (Aksaray, Türkiye) Bölgesindeki Bazı .