Have been awaiting buds to open for sometime. There were numerous abortions in the last few months. Perhaps it is too windy or too warm. At last on the 6th day of Chinese New Year, the flowers open:
My guess is Caralluma crenulata. It turns out to be correct. The stems are 4-angled and rather thin just 5-6 mm with small residual leaves. Unlike other stapeliads, it has a rather irregular habitat branching at will like a straggly Edithcolea grandis. So far it does not appear to form underground stolons/stems, noting the lack of new stem growth emerging from underground. A friend gave me a small plant that was purchased from the renown Chatuchak Market in Bangkok, Thailand. C. crenulata type is recorded from Sagaing in the dry savannah interior of Myanmar. I reckon it would be highly probable that some plant finds its way to the neighbouring Thailand which has a very developed horticultural industry.