Check out this collection of Queen of the Night or Kadupul flowers or Tan Hua, which is the world's most expensive flower, bearing no price tag at all.
The Ephemeral Beauty of Night-Blooming Flowers - The New York Times
A chance to see the Tan Hua 'bloom' before your very eyes
Queen of the night flower, Tan Hua
How to Grow Night-Blooming Cereus - Dengarden
TAN HUA Flower blooming (time lapse)
Botany in Popular Culture: The Tan Hua Flowers in Crazy Rich
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6 Most Expensive Flowers In The World
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How to grow and propagate Queen of the night/ Tanhua plant
Epiphyllum oxypetalum - Wikipedia
Kevin Kwan - For readers who are curious about the Tan Hua