Uncle Bud What Is This Plant Really Called? My Uncle Called It A Butterfly Plant.?

What is this plant really called? My uncle called it a butterfly plant.? - uncle bud

It consists of dozens of slender stems, each side with three colors of purple wine, butterfly shape / size of the petals will be completed at night and used again in the morning. Flowers often appear with little pink buds in groups at the end of the new shoots.