needrain said: I'm thinking that's a Huernia or Ceropegia. One of the so-called carrion flowering plants. Don't really know how they would pair long-term with a desert cactus. I tend to think of them as a succulent outside the cacti family. Which doesn't mean they couldn't co-exist - I just don't know.
Baja_Costero said: Yes. All the succulents in that group (which do often have stinky flowers) are now Ceropegia. You are not likely going to get a firm ID until it flowers. The flowers are kind of the highlight of this group, lots of variation in size and color and other things.
Compatible with the cactus, I think, at least for now.
It needs more light. Compare the growth below the red line to the growth above it. The plant is "stretching" in response to low light.
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Kaktus said: I will guess ceropegia red dragon