Orbea variegata, clone from my Mom's garden. We got it to bloom under our plant lights.
I learned the name of this plant as "Stapelia variegata," and so it was named by Linnaeus himself. However, the powers that be decided that it wasn't really part of the genus Stapelia--no other member had that pronounced annulus, while that was the defining feature of the Orbea. So, it was reclassified. It's like finding out that a childhood friend has changed his name.
A close-up allows you to see the essential milkweed-ness of the flower.