This is now known as Phal bellina (formerly known as Phal violacea var Borneo).
A 6N plant does not mean its flowers will be 6 times the normal size. Rather, the flowers of such polyploids will be somewhat larger, longer-lasting with fuller-formed segments and more intensely saturated floral pigments. Such plants typically grow at a much slower rate compared to the normal (i.e. 2N) plants.