PlantFiles: Colville's Glory Tree, Whip Tree
Colvillea racemosa

However, I was surprised to see it as requiring continuous watering.
C. racemosa is a native of Madagascar and I understand grows in a similar environment to the other well known natives, Delonix regia and D. decaryi, which are from semi-arid environments.
I have never seen one flowering in my country, Trinidad and Tobago, as I believe rainfall is too high (about 2000mm yearly).
I have four plants that I grew from seeds sent to me from a kind lady in Germany (surprising?) in exchange for some seeds of the "Bootlace tree" - Eperua falcata - a native of Guyana, which grows very well in our national Botanic Gardens in Port of Spain. My Colvilleas are only 3 years old and are in pots until later this year.
George de Verteuil, Trinidad,

I first saw Colvillea racemosa at Hotel Hana-Maui (Hawaii), leaf-less, and looking like a massive, upright version of Delonix regia. Seedlings, sprouted 15 days after soaking in hot water, were planted-out 10 months later. This is a fast-growing tree when young.

Another great subfamily Caesalpiniaceae, family Fabaceae tree. Foliage is beautiful, twice pinnate leaves with numerous small leaflets. Looks very similar to Delonix regia when not in bloom, leaves are not quite as bright green as D regia. Tree does not get the incredible spread of canopy that the Delonix gets either.
Flowers are very different. the clustered Inflorescences are foot or more long, with grape-like clusters of round bright orange/red flower buds. These open from the top down, spilling out long yellow/orange stamens, giving a feathery look to the flowers. Amazing site when a tree is in full bloom.
Blooms late summer to fall. Full sun & water. Briefly looses leaves in winter. Fast growing.