OK, this has become an obsession. This tree grows outside of my dad's apt. in Southern California (Upland). It is NOT a jacaranda (which is a magical haze of lavender and which ALSO blooms near him)but I can't figure out what the heck it is. I love a Google challenge and this one has been driving me nuts. My first guess is that it was a lavender crepe myrtle tree and maybe that's still a possibility. Was surprised to see the variability of crape (crepe?) myrtle trees. But now, I'm not thinking that's not what it is. Currently these trees are about 25 feet high. THANKS for all guesses!