I came across this sp. too in one of the isolated beaches in Penang. Strangely it grows on sandy beaches with plenttiful of shaded trees. If I'm not mistaken, it produces lots of clustering yellow orangy flowers but not as big as in your photo. Non stop flowering plant.
Personally I think it's more towards amorphallus or it could be totally of different genus. Nice to see it does occur in Tioman Island.
Great finding!
