| Dear Crikey, I had my little joke. I was hopeful that someone in the know would let us both know.
i did a little research on the internet and found not only media picta but also midio picta. That is a bit confusing . I was wondering if the varigated form was some form of hybrid or a natural mutation. I have seen varigated plants that have not been grafted that have thrown a branch that is not varigated and the advice is always to remove same. I wonder if that is what has happend to your plant it has simply returned to the original species or as these plants were grown from seed is it simply a case of cross polination . yours truly
Baldric | 
