Massoud Ranjbar - Department of Biology, Herbarium division, Bu-Ali-Sina University, P.O. Box ۶۵۱۷۵/۴۱۶۱, Hamedan, Iran.
Roya Karamian - Department of Biology, Herbarium division, Bu-Ali-Sina University, P.O. Box ۶۵۱۷۵/۴۱۶۱, Hamedan, Iran.
Soheila Bayat - Department of Biology, Herbarium division, Bu-Ali-Sina University, P.O. Box ۶۵۱۷۵/۴۱۶۱, Hamedan, Iran.

In this study original mitotic chromosome counts are presented for ۴ Oxytropis species from ۴ sections of the genus Oxytropis in Iran including: O. bicornis (O. sect. Oxytropis) (۲n = ۲x = ۱۶), O. suavis (O. sect. Ortholoma) (۲n = ۲x = ۱۶), O. aucheri (O. sect. Eumorpha) (۲n = ۲x = ۱۶) and O. karjaginii (O. sect. Janthina) (۲n = ۴x = ۳۲). This report is the first cytogenetic analysis of these taxa. All taxa (with exception of O. karjaginii) are diploid and possess ۲n = ۲x = ۱۶ chromosome number, consistent with the proposed base number of x = ۸. In addition, meiotic chromosome count and behavior are presented for O. masanderanensis (O. sect. Ortholoma) (۲n = ۲x = ۱۶). Although this taxon displayed regular bivalent pairing and chromosome segregation at meiosis, but some abnormalities were observed.

meiotic behavior, Mitosis, Morphology, Oxytropis, Iran