You must not be putting the right info in to the field guide. But it is not catalpa either, though getting closer.
A mature catalpa tree is very tall, with very large heart shaped leaves, with long points. In spring it has beautiful white bell flowers:
This time of year, it would probably be showing its bean like seed pods (it is in the Legume family):
when riper, they are brown and give it its nickname cigar tree.
https://upload.wikimedia.org/wikipedia/c ... a_Leaf.jpg
https://upload.wikimedia.org/wikipedia/c ... tree_1.jpg
You didn't agree with lilac? I really think that is what it is.
Sorry, I missed your location. When you are in reply mode, you can't see that any more.
I'm giving you the tree pictures, because those should be clues if you know where your leaves came from.