Hoya rosarioae Very Similar to Hoya obscura

Hoya rosarioae is very similar to Hoya obscura but has smaller flowers, much longer peduncles and the pollinina are much shorter. This information comes from a Dale Kloppenburg publication, but I can attest that this plant is a different animal than H. obscura.  I have tried to grow Hoya obscura on two seperate occasions and failed – it won’t grow for me under my conditions, but Hoya rosarioae grew very easily. Below the back of the flowers: