Texas Gardening: What is this pretty volunteer?, 1 by quilter_gal

quilter_gal wrote:
I really kind of like this pretty, leafy "tree" - it is rather non-descript with large leaves, but then it starts flowering - lilac shaped flower clusters with tiny white flowers. No scent that I noticed and the flowers only last a couple of days, then they put on seed pods.

As long as this isn't poisonous to dogs, I'll probably just leave them growing where they are. At the moment, this large one (about 30" tall and very fast-growing) is providing shade for tomatoes and strawberries in a hay bale and another one has come up in a jumbled flower bed.

Anyone know what it is? :)
Thanks!
Elizabeth