flower of an hour
/ˈflaʊər əv ən ˈaʊər/
noun
- A small annual plant with short-lived, hibiscus-like flowers that bloom for only a few hours, also known as bladder hibiscus.
- The flower-of-an-hour blooms in the morning and wilts by afternoon.
- I planted flower-of-an-hour seeds in my garden for their delicate yellow petals.
- Children love watching the flower-of-an-hour open and close in a single day.