Tim, if I said all plumeria flowers would have a yellow center, I shouldn't have used the word "all". I have some that are orange, red, and even brown. My whites and generally speaking my light pink all have yellow though.
The Celadine is now found with all kind of sizes and colors. I have been able to differentiate four sub-varieties in my own plants. Also the weather will alter colors and patterns. Heck, even the time of day will alter colors. The Celadine can be almost all yellow and almost all white. The only way to truly tell whether it is a Celadine is by examining the mature leaf borders. I think the Celadine is considered a "yellow" though. I have the Haustin White and Princess White and they are consistently "whites" with only the slightest of a yellow center.
Below are all Celadine and here's the leaf of the Celadine.
drdawg (Dr. Kenneth Ramsey)
The reason it's so hard to lose weight when you get up in age is because your body and your fat have become good friends.