Beauty is All Around Us!

On my way to the bus stop near my home, I saw this beautiful unique flower near the bus stop at Tampines. Wow luckily I have my lumix camera to capture this beautiful flower I also saw a yellow butterfly near the flower! Anyone has any idea what is the name of this pretty flower?

Update: From Facebook Nature Society group, I learned that this pretty flower is Lantana  camara and the leave is poisonous.