This is a photo from an article in Cactus
and Succulent Journal · November 2010. Skinny, but it is a cutting.
And the leaves from same article.
And the buds from same article.
I have not been able to find any proper photos (do
firstname.lastname@example.org, if you got one). The
photos below are from internet shops, selling seeds - and I can't say, if
the ID is right.
A green plant from Koexflorseeds.eu.