I think it is a Stapelia, see if the flowers stink, then it probably is Stapelia. Sorry, I can't help more. The four tip flower actually has five, one is just dwarfed (locacted at 7 o'clock),
Dan
Lincoln, NE USDA 5

I can assure you that it has only 4 petals, which is the reason I took a photo of it, as well as the other photo I have posted. Now looking at the other photo, it shows a 5 petalled and a 6 petalled flower (one of the petals is pointing toward the camera. There is no smell obvious with this flower and flies do not seem to be attracted, unlike Stapelia hirsuta which is alongside it.

Dan,

As you may know, genetic misfits are known to occur in these plants, resulting in flowers which have petals numbering other than five.

{{gwi:464225}}

It looks close to my Huernia thuretii ssp. thuretii. Your petals seem a bit longer...so can't say for sure, but check out link below.

I've had different count on the petals of some of my Stapelia as well!

~Rosemarie

Here is a link that might be useful: Huernia thuretii ssp. thuretii

I think you are correct Rosemarie. I found the pic in the link below which looks almost identical to my flowers.
Thanks.

Here is a link that might be useful: {{gwi:464224}}