I saw this at the garden center used as an arbor vine. It is Quisqualis indica or Rangoon Creeper . Apparently it's an aggressive vine that originates in Southeast Asia and is used quite a bit down in Austin. It dies back each winter but keeps coming back in the Spring. I love this vine because the foliage is dense, providing a screen from the hot sun and because the flowers smell sweet as homemade pie!
Here it is on the arbor:
