What colour are the flowers on an orange tree?

Explanation

The orange tree comes from Burma and southern China. Later the tree spread to India and then to Europe, where oranges have been grown since the 15th century. The tree can be 10-12 metres high, has thorns and fragrant white flowers. Oranges are round with a thick orange peel and juicy flesh. Oranges are picked often before they are ripe. Thereby they stay fresh during the long transport route from southern Europe, North Africa or the Middle East.