We've had this tree/bush in our yard for almost 12 years, that we've known about it.,Early June, every year, it blooms small white bell flowers that seem fragrant mostly in the evenings.,To this day, my wife and I have asked everyone that has ever seen it, if they might know just what the name of this plant is to no avail.,All the branches and main stems are hollow. As a matter of fact, I accidentally broke one of them, live, last month and for kicks, I pressed it into the ground and kept watering it.,It has been growing buds and leaves ever since. I am attempting to post as many pics as I can here,to offer what ever information might be needed to identify this plant. Any ideas and suggestions would be most appreciated. Thank You for trying to help us identify our plants.

Main stalk

Unknown Plants in our yard.

We also have a few other plants that we would like to identify.
If it appears that we are being pointed in the right direction, then I shall post images of the other plants as well. If someone has a site they can suggest for us to find out more information on our plants please feel free to post advice here.