Jeerawat Chutiwattanathada (M), the MLA1 student who goes by the moniker 'M', nominated Plumeria obtusa:
The most beautiful flower in my mind and it is also aromatic.
Photos sourced from:
http://book.baanlaesuan.com/plant-library/frangipani/https://www.instagram.com/p/BEnzx07R2om/http://kppkpacth.blogspot.co.uk/2015/02/blog-post.html