Yeah, and it's a whole different animal to the Peacock Ginger which is essentially a groundcover. The leaves on mine never get above about 6in.
That's why I'm puzzled that Kate's flowers look a lot like the White Butterfly. One explanation could be that the Hedychiums sometimes make proliferations (new plants) on the flower scapes so if she got a start of one of those, it could have had a flower that has stayed dormant until now. Very odd though, and she says it's Peacock, (Kaemferia) not butterfly (Hedychium).