Garlic vine (Mansoa alliacea): “Its compact habitat and pretty continuous flowers make it a popular ornamental plant in gardens in the tropics. Flowering twice a year you will find it quite often covered with flowers. Flowers start off purple with white throat and change to a lighter shade of lavender with age. Eventually fading to almost white. You will see 3 different color of flowers at the same time on the plant” (More here)
Shots and captures 
Beautiful.