It is very difficult to identify a camellia. There are an awful lot of them and they vary a lot. From one season to the next, one location to another, they can be so different as to look like they couldn’t possibly be the same variety. In cooler climates, or seasons, the sexual parts of the flower may not develop properly such that a double flower with stamens becomes a formal double, or a single becomes anemone centred as the stamens turn to petaloids.
It may work the other way, with a variety normally flowering as a formal double opening out fully to reveal a cluster of stamens at its centre.
In tougher conditions; hotter, dryer, poorer; the leaves will likely be smaller than is typical for the variety.
Ideally, if I have a variety I want to identify, I would take a flowering shoot to somewhere where a known, well authenticated specimen of the thing I think it might be is growing, and compare the two side by side. It does sometimes happen and it is sometimes possible to be 99% certain that the two plants are the same. I’m never 100% certain, there are varieties that seem to me inseparable, like ‘Debbie’ and ‘Debbie’s Carnation’, but they are the exception.
Usually, it doesn’t work like that. Usually I have a plant I want to identify and don’t know even what it might be. I can trawl through books and websites, compiling lists of contenders, but almost always, all I have to go on is a single picture of a flower with no foliage. Quite often the colour is suspect, especially in books. Usually there is little or no further information about size, flowering time or any other characteristics that might help with an identification.
With the internet, it needn’t be like that, in that it should be possible to do a descriptive page that is pretty much as good as standing next to an authenticated plant. That is what I am going to try to make a start on.