Pollen morphology of Acanthophyllum C. A. Mey(Caryophyllaceae) species in Turkey were investigated by light and scanning electron microscopy in this study. There are 5 species in Turkey belonging this genus: Acanthophyllum mucronatum C. A. Meyer, Acanthophyllum acerosum Sons., Acanthophyllum microcephalum Boiss., Acanthophyllum oppositiflorum Aytaç, Acanthophyllum verticillatum (Willd.) Hand.-Mazz. The pollen grains of Acanthophyllum species are radially symmetrical and isopolar, oblate-spheroidal and prolate-spheroidal, operculate, and pantoporate, their pores have conical spinules on operculum. Pore numbers and diameter, exine thickness, pollen ornamentation and operculum ornamentationvary between Acanthophyllum species