Mussaenda sanderiana

@ S Frazier, thanks for the comments. However, M. sanderiana is known to be found in Khao Yai National Park: http://www.dnp.go.th/mfcd3/khaoyaiplants...

Also, here are a couple of other photos that have been identified as M. sanderiana:
http://www.magnoliathailand.com/webboard...
http://www.flickr.com/photos/tony_rodd/3...

When I get home I will double check in the field guide where I originally made the ID from.

Cheers, Adam

@ Olivia Chee - Thanks :)

I noticed you didn't use a common name so I looked further at your spotting. I would have suggested Mussaenda philippica which has these common names Bangkok Rose, Virgin Tree, Buddha's Lamp or simply White Mussaenda http://www.flowersofindia.net/catalog/sl... However I don't know enough to distinguish between the two, but I find much more info on M. philippica, e.g. on EOL.

Interesting flower!

Thanks!

Wow! Amazing flower! ;-)