An orange is a common fruit that grows on citrus trees. what part of the citrus tree's flower does the orange develop from?

Citrus × sinensis, orange, orange or sweet orange, is a fruit tree of the genus Citrus, which is part of the family of rutáceas. It is a medium-sized tree -even in optimum growing conditions up to 13 m in height-, perennial, with a large, round or pyramidal crown, with oval leaves between 7 and 10 cm wide and often stipulated and branches sometimes with large spines (more than 10 cm).

 Its white flowers, called azahar, are born isolated or in clusters and are extremely fragrant. Its fruit is sweet orange.

 
 azahar