If you click on the blue Home tab, then put Koelreuteria in the search box on the right, you'll find quite a few useful references to this splendidly useful and utterly drought-tolerant tree, aptly known as the Golden Rain Tree, elsewhere in the forum.
As John says it does need a hot summer to flower well, but this is really only a problem in northern Europe, and never in mediterranean conditions. W J Bean of Bean's Trees and Shrubs said that the finest specimens he'd seen in Europe were in central France.