The first enigma is that N. petersiana blooms during the day but recent molecular studies by Dr. Thomas Borsch and others show it more closely allied with the subgenera Lotos and Hydrocallis (Abstract), tropical night bloomers. This non-scientist writer can only wonder if it could be the "missing link" between day and night blooming tropicals, something hybridizers have dreamed of.
The second enigma relates to N. lotus, a night blooming tropical (subgenus Lotos), also native to Africa. Several sources report that it is day blooming in South Africa. It is hoped that new collection of both these species from the wild planned for 2003 and subsequent cultivation will shed more light on them.
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