Identification: Plant ID

Hi all
I was given a cutting of the attached succulent. My friend is from Thailand and I think this is from Thailand. She is not available in the country to tell me what this is. It recently produced a tennis ball sized bud (with a pointy end) which opened yesterday to this flower. It's amazing!
thanks

 

It's a Stapelia, but I don't know which one.

 

Thanks! I'll look up the details.

 

It is Stapelia gigantea. They are grown all over the world.

 

Thanks Rosemary. I'm thrilled to know that now.