I was looking up some descriptions of new species of Ceropegia on Friday night. I found one on Researchgate from 2015 for a species called Ceropegia terebriformis. The specific name terebriformis means "drill shaped" and refers to the tightly spiralled top of the corolla looking like a modern drill bit. It was only found once. The living plants they had collected grew very well for a while but all died. No uses were recorded.