A study of flower biology on Vitellaria paradoxa was carried out in the Sudano-Guinean zone of Cameroon. Phenological data was collected and specimen insects captured. It was noted that the shading of leaves of Vitellaria paradoxa was from November to January according to individuals. Preflowering last for about four weeks and is characterised by different morphogenetic phases from the apparition of a flower bud to the fall of corolla. Vitellaria paradoxa flowers between November and June usually on leafless branches. Flowering is influenced by temperature and during flowering period, relative humidity is low. The anthese period oscillates between 18 and 23 hours. More than 54.22% flowers complete their anthese process. For fruit bearing, the treatment effect is highly significant (P>0.001). 2616 visits of 45 species of insects were registered on Vitellaria paradoxa flowers during the observation period.