@Ticomaya,
Yeah, and it's obviously not a native, is actually from tropical America, whereas Parkinsonia is a native to the southwest US, and, frankly, looks more "fitting" in the environment. I've an increasingly strong bias toward natives, or relatively heavy use of them (hah, I've lots of lavender in my own yard).
I don't know that much about Wright's planting strategies, know more about Neutra. But.. that tree at Taliesin was well pruned and sure was pretty the day I saw it.
Also the Thevetia is poisonous - all parts, if ingested. I used to have one for a while in Venice, and I worried about kids picking up the rather gorgeous seed pods in our alley; eventually took it out.
You're doing nicely, as usual, in F. Football..