The guy said that this particular plumeria is often called an obtusa but said that he was absolutely sure it was not one and the same. He says the plant that is found in a small area of PR is found nowhere else. The petals are narrow and pointed and don't overlap. The leaves are rounded and at least in the photo that he sent me, and that I posted, the leaves look like no plumeria I have ever seen. He also said that the fragrance is unlike that of the obstusa and is stronger.
Perhaps this is a variation of the obtusa. I just don't know.