Nominated by Matthew Peilow, who said:
I first saw these trees in Sydney, Australia, and was mesmerised by their magnitude of colour! They flower for weeks from mid-October and are a sign of the better weather to come.
Tree facts
Height: 5-15 m
Bark: Grey-brown, smooth when young, finely scaled when mature
Leaf: Opposite, bipinnate, with 13-41 green leaflets
Flower: Purplish blue, tubular, in terminal panicles
Fruit: Oval, woody seed pods, containing winged seeds
Native to central-south South America, it is planted widely in sub-topical countries for it's long lasting bright lilac-blue flowers.