Cananga odorata

Cananga odorata, known as the cananga tree, is a tropical tree that is native to India, through parts of Indochina, Malaysia, the Philippines and Indonesia, to Queensland, Australia.

It is valued for the perfume extracted from its flowers, called ylang-ylang (a name also sometimes used for the tree itself), which is an essential oil used in aromatherapy.

Archiopedists would write more about the subject, but they think that Wikipedians have already said it best.