Plenty of fabulous photos in this thread but not very many flowering trees. Here are a few from around the streets and gardens of Cairns. The photos are a bit amateurish but I hope they don't detract too much from the beauty of the trees.
Brachychiton acerifolus. A native of the rainforests on NE Queensland. Common in gardens and also called the Coral Tree
Mucuna Bennetti or Flame of the Forest. Not really a tree but a massive vine, native of Papua New Guinea that invades the largest of trees. The site of a tree covered in this vine in flower is breathtaking. A true tropical it will not grow in temperate or even sub-tropical climates.
Cassia Fistula. A very common Cassia that flowers in spring. There are streets lined with this tree in older areas of town. A spectacular sight in suburbia.
And finally, the Poinciana. It is at its best when flowering after a very dry winter when all the green leaves drop and all you can see is this massive brilliantly red tree. It is a little too wet here in Cairns to see it at its best.
Grant