The present study includes the whole genus Madhuca and is not restricted to those of the Malaysian area only. The results of this study could not have been obtained without the kind help of the Directors of the herbaria of Berkeley (U.S.A.), Berlin, Bogor, Florence, Jamaica Plain (U.S.A.), Kepong, Kew, Lae, Leiden, London, Manokwari, Paris, Singapore, Utrecht and Washington to whom I express my most sincere thanks. The abbreviations of the names of herbaria are those proposed in the Index Herbariorum by Lanjouw and Stafleu. The herbarium of the Forest Department in Manokwari, is still indicated by Holl, the original abbreviation.