exact dates I have reference for are contradictory so I'll be vague....
Flora was designed by Toikka for Nuutajärvi circa 1966, Nuutajarvi was owned by Wärtsilä who also owned Arabia. Early 'flora' has Nuutajärvi labels, from some time in the early 70s they were marketed under the Arabia brand with a variety of different labels, and from some time in the mid 80s to today all Nuutajärvi production has be sold as Iittala following a merger of the two company's which are now owned by the Hackman group. Older Iittala labels are triangular, more recent rectangular.
All the above is open to correction and clarification.