Hoya pauciflora is an native of India that I have kept for a long time and never been successful in blooming.  I do love the shape and form of the plant, and hope to get it to bloom for me one day.  **Edited 12/26/11**  I have finally bloomed this plant after 4 1/2 years of trying.  I think what finally did the trick for me is subjecting it to very cool temperatures (50° nights) and then bringing it back into a very warm temps (84° days).  This was all done under artificial light.