I was curious if anyone might be able to identify a tree. I've included a picture, but wish I could have added another showing more than just leaves and flowers.
It seems to be a common landscape tree in Fort Collins. It has a relatively smooth bark, and the branches start out sort of twisted from the central core. It's blooming now with white petals and a yellow center. Very fragrant, and seeming to set off allergy problems. Bees like the flowers.
Later in the year (by September, but probably starting earlier) the leaves turn a dark dull purple.