Hoya krohniana is a newly determined Hoya species that has been known in the trade for years as the “Heart-Leafed lacunosa.  It is a highly recommended plant that likes it a little cooler than H. lacunosa if you want to bloom it.  The plant blasted buds at least 10 times in my 85° plant room, but quickly bloomed after I took it out of that area.  The blooms smell every bit as sweet as lacunosa.  I consider this plant a must have for beginner and advanced Hoya collectors alike!

Here is a video showing the plant from 2013: