Looking at the stems, foliage, and timing, I suspect the unknown portion of the parentage is not a typical floribunda. It seems to have a lot in common with other floribundas and shrubs of this Kordes era. Which may be why Magenta was a better plant than most of its time.
i know this post is old, but do you have any suspect(s) for that unknown parent or was it maybe never commercialised as to keep that plant in the company?
