Flower: side
Flowers begin to open at 6 p.m. and fully open by 9 p.m. Stamens drop in the next morning.

Nectar
All stamens removed. Copious nectar, up to 0.5 ml, is secreted at night. White filamentous structures are petals.

Longisection of flower bud
Starch is accumulated at the base of a calyx tube (stained purple in insertion). Starch dissolves simultaneously with flowering,

Stigma and scales
A mucilage substance presents on stigma to which pollen and scales of moths are attached.