Dear Dr. Huda Altameme, the following paper probably is helpful: Basiri Esfahani et al. 2011. A taxonomic study of Acanthophyllum C. A. Mey. (Caryophyllaceae) in Iran. Iran. J. Bot. 17: 24-39. http://journals.areo.ir/article_101550_ef6135c0333b072709a9915aaa84275f.pdf