We aren't sure what kind of tree this is. One tree-trimmer guessed acacia, and google seems to agree.
I wish the tree was like this all year long, but it only lasts about two weeks, and then the wind kicks up and all the blossoms blow into our neighbors' yards. One neighbor suggested we cut the tree down for this reason. It's impolite to give your neighbor the finger, so I just said no.
For the two weeks the blossoms are on the tree, the whole thing hums with hundreds of bees. Some are honey bees, some are big and black -- carpenter bees, I guess?
Here's a closer look.
The only problem with this tree is that it's not in my back yard. I'd like to lie in its shade and stare upward for a while.