I'm sorry, Beba, I missed your message above.
I guess the flowers are now over, but I don't know whether M. vetula is self fertile. I suspect not, as I have flowers on my M. vetula vetula every year, but no fruits seem to come.
As for M. hahniana, I think that one might be.
I wouldn't expect a cross pollination to work, they are quite different species, not even closely related.
I still have some flowers even now on New Year's eve, in my greenhouse which is at about 6C. M. rhodantha and M. polythele have just a few on a couple of plants.