Pollen morphological studies have been carried out by SEM on 23 species ofSorghum(Gramineae) in order to resolve the exine surface patterns in sectionsEu-sorghum(subsectionArundinacea-seriesSpontaneaandSativaand subsectionHalepensia), andPara-sorghum. Basically, two exine ornamentation types have been observed viz. granular and insular. In sectionEu-sorghum, seriesSpontaneaandSativa(of subsectionArundinacea) are heterogeneous having both types of exine pattern. In the same section, subsectionHalepensiais characterised by having only a granular exine. SectionPara-sorghumshows a marked pollen morphological similarity with subsectionHalepensiaof sectionEu-sorghum. Snowden's concept that the two seriesSpontaneaandSativaare closely related and that the cultivatedSorghum(seriesSativa) might have evolved from the wildSorghum(seriesSpontanea), is supported by the present observations.