I
This is the kind of roebelenii you want to use making crosses with sanderianum and her hybrids. Good stuff!
Dot,
roebelenii in its true sense equals long, pendulous, twisting petals. philippinense= shorter, twisted petals held outward ~45 degrees from the pouch. Of course, over the years people have cris-cross these plants and possibly overlapping ranges in natural as well, you end up with all kinds of variations. IMHO.