N. burbidgeae x rajah is N. Alisaputrana
I want three of them as well. Perhaps BE may have some in their N. burbidgeae seedgrown set. I hear N. Alisaputrana was growing side by side N. burbidgeae on Pig Hill, so perhaps they may have crossed or back crossed to N. burbidgeae. Generations of cross species over a sympatric region could only help strengthen their potential blood line. My hunch is that many species may have crossed outside their species and then back crossed to increase genetic variability. Imagine your great great grandmother that had one eight Cherokee, but her kids and your family tree looks 100% caucasian. Or are all the Miss America contestants LIARS when they say they are part Cherokee, or Spanish or Chinese, etc.
Just a thought to throw things off balance.