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Pollen morphology of all Iranian Celtis species was examined and compared with some African Celtis, using light and scanning electron microscopy. Pollen grains are triporate or tetraporate and the main shapes are prolate and subprolate. Most of the Iranian Celtis grains are bigger than those of African species. Sculptural density of pollen is lower than in African Celtis.fatcat:4gbkl2kcfbdbdfysvqg6y4yh4u