This is just one clump of the blooms on our catalpa tree. They remind me so much of orchids. The tree will have long brown seed pods in the fall, most of which will cling to the tree over the winter.
My husband tried unsuccessfully to start a catalpa until he realized that, if left to Mother Nature, the seed pods would be frozen over the winter. Once he placed a seed pod in the freezer and then planted the seeds, they grew quite easily. (Each pod has a large number of seeds, not just one). It has now grown into a lovely shade tree in our front yard.