score:31
I was hoping that someone with better resources on Aztec mythology would speak up, but in absence of that, I'll tell you what I found looking into this online. Chief among it was that I could find nothing whatsoever backing up that interpretation of the five flowers, and lots saying it meant completely different things. Given that, my suspicion is that this is a misinterpretation of the source material on someone's part. If not yours, then the article authors' (or perhaps their source's).
Xochipilli is associated with both the Seven-flower (Chicomexลchitl) and Five-flower (Macuilxลchitl). The "Five" variant appears to be part of a series (of yes 5) of 5-named deities that are all associated with excess or pleasure. Sort of an Aztec analog to Christian culture's Seven Deadly Sins. The fives are Five-vulture, Five-lizard, Five-rabbit, Five-grass, and Five-flower. Five-flower in particular was associated with gambling and music.
The Aztecs did have a belief that there had been 5 Suns (taken literally, or "worlds" less literally), but they didn't think all existed simultaneously. Rather that the world had ended 4 times previously, and it was their sacred duty to prevent it happening a 5th time. There is no indication I can find that they believed there were currently other worlds out there.
Azetcs were also not a particularly maritime people. In fact their empire had noticeably little coastline, considering where it was, and their capital was about as far inland as you can get in Mesoamerica. Most of the archeologists specializing in their larger Nahua culture will tell you it likely originated in the Southwest American deserts to the north.
So I'm not finding much support for the idea that they had any concept of whole other continents existing beyond their eastern and/or western sea, and given their cultural roots and outlook, it seems highly unlikely.
Upvote:89
Do you know how many continents there are on Earth? (I don't!) Is Europe a separate continent from Asia? Is Australia the biggest island or the smallest continent? Is Antarctica an ice-locked archipelago or a continent? Are the Americas one continent or two? (All of those questions can be answered reasonably either way.)
The separation of Europe from Asia into two continents happened because, from the point of view of the Greek Mediterranean world, all of Asia that mattered was across the sea from all of Europe that mattered. They knew that Europe and Asia were connected north of the Black Sea (though they didn't know how big a connection) but they didn't care, because for their purposes, they were separate continents.
The idea of a continent is more a cultural thing than anything else.
(From a proper scientific point of view continents are probably better defined by tectonic plates so now you're dealing with twenty or so. Maybe a continent is a tectonic plate with dry land attached? That still leaves quite a few. (And how much dry land is needed? And is Los Angeles on a separate continent from New York?)
If the Aztecs knew the geography of the whole Earth it would still be very surprising if they had counted continents the same way the Ancient Greeks have led us to do.
And there's no evidence they knew the geography of the whole Earth and considerable evidence that they didn't.