Bauhinia blakeana

The flower on this 1997 Hong Kong stamp belongs to that of the Hong Kong Orchid tree.

The real flower looks like this:

These trees were laden with flowers that were still fresh with several still in the budding stages when I saw them over the weekend at a park. The leaves are butterfly-shaped and the flowers looked like another specie of butterflies fluttering amongst them. The photos have been digitally enhanced to emphasise the brillance of these blooms in the strong morning light.