It may help to talk a little about "what is a pattern name". First and best, is where the name is given by the factory and they printed it on the back, as that way the whole world knows it and calls it the same thing. Second best is when the factory gave it a name, which they recorded in their pattern books, but did not print it on the wares. Later research may have enabled the correct names to be applied to these patterns, which were either listed previously as unidentified or had been given a name in the meantime.
This brings us the third best, which is where a pattern has been given a name by an earlier authority (author or learned society) and that has become the accepted name and used widely thereafter.
It appears that your pattern falls into the fourth best category. One author has apparently given the pattern a name and that name has NOT been widely taken up as an accepted name for that pattern. It may be simply because that pattern turns up so rarely today that few clamour for an accepted name.
Put in simple terms, as I understand it, Ivy & Flowers is not THE name of your pattern, but rather it is A name that Ellen Hill gave it. However, that book is one of the few I do not have access to, so may be wrong. Not sure where the 1855 came from either.
The good news is that you do have a definite maker and your china dates from 1851 or later, which is all confirmed from the backstamp.
Your latest discovery is from the Rorstrand factory of Sweden, which was one of the few Continental European factories to produce transferware. They were not especially original and copied even Wedgwood patterns, as well as Mayer.
In searching in the future the only real concrete peg you have is Mayer. The problem is that you will see an awful lot of other Mayer patterns, before occasionally you hit on Ivy & Flowers or whatever it is called.
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