I would guess too that this is a hybrid. I have basically versions of both hybrids that are quite large and hybrids that are on the small side, like my neopabstopetalum. I think as well that it's not so unusual for hybrids to lack fragrance. I have a couple that don't have very pleasant fragrances, one that's lovely, and a couple that don't really smell at all. It seems zygos can be a bit of a mixed bag, then again what hybrids aren't?