Abstract
Karyotypic studies were performed on 12 species/ populations of Iran- ian tulips for the first time. The species/ populations possessed 2n = 2x = 24 chro- mosome number but varied in details of karyotype including type of chromo- somes, karyotype symmetry and number of SAT-chromosomes and differed sig- nificantly in total chromatin length as well as length of chromosome arms. A pair of heteromorph chromosomes occurred in T. humilis. The use of karyotypic da- ta in taxonomy of the genus Tulipa L. is discussed.
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