Hello Maggi,
very nice plant, but in my opinion it is an hybid between S. multiflorus and S. pole-evansiae. The tepales of the single flowers are wider than by S. puniceus
and the form of the whole flower is a bit like S. multiflorus ssp katherine. However ist fine flower!
Today the flowers of my S. puniceus are full opened, the first time after 10 years! In 2012 arrived me some seedlings, they were ca. 5 mm in diameter.
Here You can see the whole of diversity of this species.
Regards
Ralf