Chromosome number reports in Astragalus sect. Onobrychoidei (Fabaceae) from Iran

In this study, original mitotic chromosome counts have been presented for 10 populations belonging to 6 species of astragalus sect. onobrychoidei: a. aduncus, a. arguricus, a. cancellatus, a. lilacinus and a. vegetus. all taxa were diploid and possessed 2n = 2x = 16 chromosome number, consistent with the proposed base number of x = 8. in addition, meiotic studies revealed chromosome number of 2n = 2x = 16 for a. aduncus21 and a. brevidens and also 2n = 4x = 32 for a. vegetus99. although this taxon displayed regular bivalent pairing and chromosome segregation at meiosis, some abnormalities were observed.