Comparative cytogenetic within <i>Achillea</i> genus (Asteraceae) in Iran

The cytological features including chromosome numbers and detailed measurements of 46 populations ten Achillea species ( A. aleppica, bibersteinii, eriophora, filipendula, millefolium, nobilis, pachycephala, tenuifolia, vermicularis, wilhelmsii ) were reported from Iran. Sample plants seeds collected diff erent geographical regions Total length, long/ short arm ratio, centromere index, total form percentage, inter intra-chromosomal different relative lengths the mitotic chromosomes calculated. showed one basic number x = 9 with two ploidy levels 2x 4x ). nobilis pachycephala , for first time are new to science biebersteinii (4x) (2x) . mean length ranged 3.8 μm in millefolium Semnan, Chasham, Sirat 6.37 Golestan, Agh Emam. Karyotype analysis indicated that taxa have predominantly median sub-median centromeres. Several karyological aspects these discussed light cytogenetic data.