Palynology study was undertaken on 32 taxon of Malaysian Dipterocarpaceae belonging to four genera Shorea, Hopea, Parashorea and Neobalanocarpus heimii, to investigate pollen morphology systematic significance at lower hierarchical levels. Results show that pollen morphology within these four groups is fairly uniform. There is no character that can really separate these four genera. However S. maxima can be distinguished from other Shorea by its crotonoid exine ornamentation and it could be a diagnostic character for this species. The colpate apertures and the closely comparable exine ornamentation confirm the homogeneity of this tribe. This is similar to the results reported by Erdtman (1952) and Maury et al. (1975). The presence of two types of pollen grain, tricolpate and tetracolpate, strongly suggests it corresponds to the species chromosome number or more specifically polyploidy. The results of this present study show that there are overlapping morphological characters in these two closely allied genera Hopea and Shorea. The pollen morphology in Hopea shows an agreement with Ashton’s classification (1982) at subspecies level. All species in Parashorea show similarities in pollen morphology with an exception in P. tomentella which is slightly different in exine ornamentation. This study has shown that pollen characters do not provide much information for systematic analysis especially at lower hierarchical levels except for genus Hopea.