This is one of the tall and straight growing Clerodendrums. From the Verbenaceae Family, it is known by its common names Tube Flower or Skyrocket.Interestingly, the few Clerodendrums e.g. C. calamitosum, that I know with white flowers typically have showy red hard sepals that remain after the flowers are shed. Unfortunately, this one does not have fragrant flowers. A link is attached below:
