Wait,how did I post two of these? Thats wierd.

you cannot actually id a plumeria from a picture. Even a flower can only be said to be probably a ....Only by knowing the plant the cutting came from is the only accurate method. All others are speculation and often wrong speculation. seedlings can look just like named varieties except they came from a seedpod on a different plant. There is so much variety in seeds that it leads to incorrect ids too often.

So,when it flowers I will be able to tell?

Only that it looks like a certain plant but not that it is. Only when we have genetic codes decoded for plants will there be any certainty. Too many genes in these plants. Boy if we did have codes, we would find tons of imposters out there. If it is a basic yellow or white, you can be fairly accurate.