Nick Maclaren wrote:

Oh, by the way, the other common name is Queen of the Night - which,
given David Poole's description, is not unreasonable.

The 'original 'QOTN' is supposed to be Selenicereus grandiflorus, but
it seems that almost any night blooming cactus is dubbed with the same
name nowadays. Just goes to prove that any reliance on common names
is risky at best. There's a superficial similarity in flower shape,
size and colour, but see the two side-by-side and they are very
different.