bigdog

Erlend, I don't think that it's 'Helen', as that is still an awfully new introduction, and this plant seems to be very well-established. These seeds are also black, whereas the 'Helen' seeds that I've received have been rather gray in color.
I did have a couple of dead M. sikkimensis seeds lying around, and used them as reference. They were noticeably larger, but the same, irregular shape. I think it could be a M. sikkimensis X also, or just M. sikkimensis. Whatever it is, I look forward to growing it in my yard!