Either it's a common word that is just hard to spell, and sticking to actual spelling is the saving grace as people who didn't know the spell will have a fighting chance to remember it.

Either they come up with an easier to spell version (e.g. "fuxia", but then those who knew the right spell will have to remember both, and those who "misspelled" the flower will be thinking Google's project name is the "correct" spelling.