Hylocereus undatus or Night-Blooming Cereus. A member of the cactus family, the blooms appear at night and soon close after the day starts. There seems to be many Chinese names: 霸王花, 曇花, There’s a Chinese saying “曇花一現” meaning something extremely rare; short-lived; “a flash in the pan”.
由於在晚上開花，而且又很重的花香，所以又叫月下美人。晚間開放，至次日早凋謝。開花時長4，5個小時，因此用曇花一現來形容時間很短、稍縱即逝的機遇。
- Hylocereus undatus commonly known as Night Blooming Cereus
