I have four of these beautiful trees on my property. 30-40 feet tall.  Enormous leaves the size of  pointed dinner plates.  They flower every June. Very aromatic blossoms. At other times they develop long hanging seed pods that resemble super-long green beans.   I have even used dead limbs and branches as a fragrant wood for barbecue. I've always wondered what these trees are called.  Can anyone help?    thank you.