Some years ago I purchased some supposed M. rubinea seeds, and just a couple of them sprouted. Several years latter, only one of this plants survived but obviously it is not M. rubinea.
However this plant has shown a good cold hardiness. It is planted beside my M. basjoo (regular and Sakhalin) and my M. sikkimensis (Red Tiger) and at least it showed the same cold hardiness. I would guess it is a little bit more hardy because the leaves stay green longer and start growing in spring some weeks before basjoo. But of course this could also be due to a microclimate
In any case no idea what species it is.
I take this pictures of the male bud and fruits this morning, could somebody help to identify it?