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Ok, so when in doubt, point to the botany version seems to be the rule! The only one you'd missed, I think, was Pfiesteria piscicida.
Now the task is to try to sort out the articles on botanical nomenclature, so that there is a page ""specific name (botany)"" to link to (or perhaps a section of an article). At the moment I'm just trying to understand what articles there are and how they interconnect.   "