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Some days ago the particular cactus Strophocactus wittii (syn. Selenicereus wittii) was in flower. Unlike most of its relatives, it is not native to American deserts but to the widespread floodplain forests of the Amazon where it twines around the trunks of riparian trees. Its flattened leaf-like shoots attach to the bark with aerial roots. Occasionally the cactus gets inundated as it colonizes the trunks at floodwater levels. That's where the seeds float on the water as they contain air-filled chambers. The seeds develop after fertilization of the flowers by specialized night-active moths being able to penetrate the long flower funnel. Length and blooming habit of the white flowers indicate relationship with species being