I have had a number of these plants over the years. Always labeled Hoya carnosa for the Wax Plant and Hoya carnosa 'Compacta' (Hindu Rope) for the curly leaf variety. But sometimes they are labeled just Hoya compacta which I don't believe is correct. I have never known it to be a hybrid but rather a form of the H. carnosa. H. carnosa f. compacta might be more accurate. I don't know for certain at this point in time since names and classifications can change quickly in the plant world.
