Onc. Charlesworthii name

[wuness]

I just did a bit of research on this plant. Seeing that the name ends in -ii, I assumed this was a species. It is, however, a hybrid between Onc. noezlianum and Onc. incurvum. Does this violate some rule of taxonomy that attempts to distinguish between specific epithets and grex names. I don't think I've seen anything like this before. (By the way, this same name applies to another Oncidium hybrid with different parents to further add to the confusion.)

wuness