Most of the time, I love more the form and architectural bark of this tree, and less of its yellow flowers.
But the tree that left a lasting impression on me was the one at Esplanade Park, where a plaque was put up on the tree, where its branches are so low that it touched the ground and one can see the flowers up close.
A link on this tree species is attached here:http://www.bonsaihunk.us/info/CaesalpinaFerrea.html