Here's a website someone pointed out to me some time ago. Lots of good info there. Maybe you can find it? Sorry I'm not more help than that. I am terrible at remembering names, but I think I know what you are talking about. If I remember correctly, it is a legume, interestingly enough.

Good luck!

Here is a link that might be useful: Morton arboretum

It may be a Catalpa tree. I have one in my back yard. It gets very pretty
flowers on like you discribed. It is my Northern orchid tree! They smell
good too. The leaves on the tree are large and kind of heart shaped.
In the Fall they have long hanging brown seed pods. It is a fast growing tree.
some people don't like them because they think they are messy, but I
love the large tree and flowers!

Thanks SO much garden4bees! That's it! When you mentioned the seed pods I knew you had it, and a google search turned up some great info. I liked a picture of a catalpa flower below. Just gorgeous.

Thanks also, cantstopgardening. That's a great site! I live near the Arboretum but never thought to check out their site. Can't wait to visit them soon :-)

Here is a link that might be useful:

Another picture, I couldn't resist!

Here is a link that might be useful: {{gwi:1051449}}