Abstract: Eucalyptus citriodora is a self-compatible, protandrous, monoclinous, mass-bloomer tree. Protandrous nature prevents intrafloral selfing. Geitonogamy becomes predominant. Eighteen different insect species were recorded at the flowers foraging for nectar and pollen. The inefficiency of the visitors made the plant into anemophilous nature. Fruit set was unaffected when the insects were excluded from visiting the flowers. Flower and pollen anthesis, pollen release took place during day time. Nocturnal pollen release was not observed. The shifting of pollination system might be viewed as one of the adaptive mechanisms for tropical conditions.