I need help to identify the following tree. It is commonly seen in Hong Kong. However，I can't find it when searching for it under the common trees in Hong Kong. What is the name of the tree?
It looks like Bougainvillea sp. from the picture. It's a common ornamental vine in the sub-tropics. The pink leak-like bracts are not the flowers. The true flowers are the small button like tips in the middle. Hundreds of varieties in different sizes and colors are available.