The Queen's Crape Myrtle (Lagerstroemia speciosa) is a common flowering tree and it's planted for it's beauty. Some people call it Banaba. Banaba extract, obtained from the leaves of the plant, is high in plant insulin, known as corosolic acid. Herbalists claim that the extract produces anti-diabetic effects when consumed by humans in the form of dietary supplements, juices or teas. Tea made from the leaves is said to help you to lose a few pounds. If you Google it (or Bing) you will find that the more expensive the product, the better it will work.
I think that I will just enjoy the beauty of the flowers.