Hi again Zuzu,
I think the reason we have disagreement over whether Zinnia hybrida is a synonym for Zinnia peruviana or not is that there are two totally different meanings for the word "synonym".
I was making the assertion that "Zinnia hybrida is not a synonym for Zinnia peruviana" in the normal meaning of the word, implying equality or interchangeability. You were basing your statement on the list of taxonomic synonyms in the Catalog of Life. The meaning of the word "synonym" in the Catalog of Life is entirely different. It does not imply equality, but instead is a list of incorrectly identified references to Zinnia peruviana (in which the writer used some other identification, a taxonomic synonym.) The CoL list of synonyms listed two different occurrences of the incorrect use of the phrase "Zinnia hybrida" in reference to Zinnia peruviana.
Incidentally, your link to the Catalog of Life entry seems to be broken at this moment.
The special meaning of the word "synonym" in a taxonomic context is described in this Wikipedia article. https://en.wikipedia.org/wiki/...
You made the mistake of thinking that the Catalog of Life synonym list empowered you to substitute the phrase "Zinnia peruviana" for the phrase "Zinnia hybrida", which it does not.
Incidentally, I did some exploration in the Catalog of Life in the area of zinnias, which I know something about, and found that it was far from up to date and not a useful resource or reference. Too bad it's not up to date. It could be useful if it were. I will not be referring to it for my own use. They are still working on it and maybe some day it will be a reliable reference.