It has to do with both. Not only can you often see marked differences between plants of the same species, on some, because the blooms last for such a long time, two spikes concurrently *on the same plant* can have flowers which are vastly different in color and pattern, depending on the temps and nutrients each spike received while it was developing. Many harlequins are notorious for this, producing flowers with broad, Dalmation-like spots one season, or a haze of tiny, pinprick-like spots the next.it seems that the flowers for phal zebrina can look totally different from one plant to another. does anyone know if this has to do with culture? or does it have to do with genetics?
Phal zebrina, acutifolia, sumatrana, and Polychilos sumatrana all refer to the same plant.