Ceropegia rupicola comes from Yemen; Ceropegia aristolochioides comes from an area between Senegal and East-Africa, in other words, from the tropical area just south of the Sahara. Normally these two species do not come into contact with each other, but in collections this is quite possible and this is what happened. The result is the cross of which you see the flower in the picture below.
The flower and stem are similar in structure to that of C. aristolochioides, but it is much larger. Barring the difference in size, the plant could easily be mistaken for an aristolochioides, but for the fact that the seeds were definitely collected from a rupicola plant. One of the reasons that there are not more hybrids from these two species, unlike for instance C. sandersonii and C. stapeliiformis which produce many hybrids, is because rupicola is difficult to keep in cultivation and you need to have a large plant before it flowers.
The C. rupicola x aristolochioides prefers conditions more like those in the natural habitat of C. aristolochioides, that is: hot and moist, rather than the dry heat in which C. rupicola grows. It can take drier conditions, but then it will not grow so very fast. In cultivation, it can also take cooler conditions, down to 15°C, but it does a lot better when it is kept warmer.

 

Ceropegia rupicola x aristolochioides

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