Poinsettia

Euphorbia pulcherrima 

The poinsettia's species name pulcherrima means "most beautiful" and that it is! Euphorbia pulcherrima is named after Dr. J.R. Poinsett, and was introduced to gardeners in the early 19th century. Source http://www.flowersofindia.net/.  This species is Native to Mexico.Widely planted as a ornamental plant.