Commonly known as Indian Rosewood or Black Rosewood from the Fabaceae (Leguminosae) Family, this tree was introduced at least 5 years ago to our roadsides for shade and they were planted in lots of places.
The one I planted at HortPark flowered recently. I have to admit the flowers are not conspicuous and are hardly attractive. Anyway, that was why it was not planted for its flowers. 2 links are shown below: