So not even in America are people having rumdul tree? I need to ask local Cambodian people if they have got it

Never heard of it before but sure has very unusual flowers. Looks like you should be able to grow from seeds if you can find here in US.

@Cherupushpam Hospital Thank you for your comment: where are you located? In which country? And where did you get your rumdul tree? Please share your experience on this tree, its information is really scarce so anything you have will be highly appreciated. Could you share some photos of your rumdul tree please

Seems like he is located in Kerala, India.

Very unique flower.

@Kukane Wyndell Yes indeed & it is said to be very fragrant, unfortunately almost nobody has planted this tree to be able to share first hand experiences