Finally Flowered Hoya maxima Red Corona!

It was a difficult long process, but finally I flowered one of the imbricate Hoya species.  Plant scientists need to do a study and survey on these plants as I am very confused on differences between H. imbricata and H. maxima. They are all shingle plants with the same symbiotic relationship with ants. There are supposedly species whose leaves get to be 10 inches in diameter.  That I would love to see!