The pollen morphology of 13 species of the genus Moringa has been studied. The pollen exine is rather distinctive and uniform in structure throughout the family. It is spheroidal, tricolporate with costate colpi, the ornamentation is psilate with sparse puncta, the endexine is very thick at the apertures but almost absent from the mesocolpial and polar areas, the foot layer is thick, the interstitium granular and the tectum thick. Six of the species have pollen grains larger than those of the rest of the genus. Pollen size correlates with macromorphology and it is postulated that polyploidy may be present. Pollen morphology and the relationship of the family is discussed.