Unknown tree

I've seen this tree on many occasions but I have no idea what it is. There are many of them in flower at the moment. I have no idea whether they are some imported species, but somehow think that they may be a native species.

The mass of bell like flowers fall from brilliant greent leaves and make a spectacular sight.

I just don't know what they are. Shall have to try and find out.

(This photo was taken at Fort Lytton, Queensland)