I think it probably was entered as a cultivar on the basis of the MOBOT sign in jmorth's photos. But speaking of that sign, I'm going to change the species to thyrsiflora. I suspect we once listed K. thyrsiflora as a synonym of K. tetraphylla, because we once (foolishly?) took The Plant List at its word, but now that we know it's a separate species, I'm going to follow the MOBOT sign all the way.