Abstract
The present study represents phylogenetic analyses of Plumbaginaceae with emphasis on Acantholimon from Iran using nrDNA ITS and plastid trnY-T sequences. The analyses support the monophyly and the close relationship of Limonium, Armeria and Psylliostachys. This is the first report of the close relationship between Acantholimon and Cephalorhizum. The data for the position of Cephalorhizum is unclear. The Shimodaira–Hasegawa test of nrDNA ITS and the combined datasets indicated that Acantholimon and Cephalorhizum are distinct genera. The molecular data revealed that the traditionally recognized multi-specific Acantholimon sections (Acantholimon, Acmostegia, Glumaria, Microstegia, Staticopsis and Tragacanthina) are not monophyletic. Their members are intermixed with each other and scattered across the Acantholimon clade, but the smaller sections including Platystegia and Pterostegia, each comprising two species, are monophyletic.
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