Hoya cv. Kaimuki is a cultivar developed by  Michael Miyashiro of Hawaii that combines H. macgillivrayi and H. archboldiana.  I received this plant in the summer of 2012.  It arrived with rotted roots so I needed to take a cutting and start the plant over from scratch.  It quickly rooted and I was able to flower it nine months later in the spring of 2013.  I believe that most of my luck with the macgillivrayi/archboldiana complex stems from giving the plant continuous 12 hour days, which are only achieved around here by using grow lights.  This plant has huge bloom, which measure 3 inches across from point to point, and they are very long lasting – up to two weeks

I also find that this complex can have huge variation in flower color depending on how it is grown.  I would not be surprised if the next time I flower this plant it would bloom all red.