It is sometimes called the Hong Kong orchid : Bauhinia blakeana

This tree was discovered in around 1880 near the ruins of a house on above the shore-line of western Hong Kong island near Pok Fu Lam and propagated to the formal botanical gardens in Victoria/Central. It was later named for Sir Henry Blake, British Governor of Hong Kong, from 1898 to 1903 who was a keen amateur botanist, by the man who made the first thorough scientific description of the 'Hong Kong orchid tree' S. T. Dunn, Superintendent of the Botanical and Forestry Department, who assigned it to the genus Bauhinia and named it after Blake in his paper of 1908.