When do certain flowers open and close?

"Carl Linnaeus, the eighteenth-century botanist, even invented a floral clock. Noting that petals open and close at the same time each day (because they're synchronized to how much light they receive), he arranged flowers in sequence, using the movement of petals to tell time." --Diane Ackerman.





Does anyone know of any books that can tell me what time of day certain flowers open and/or close?





Does anyone know of any flowers that open at 3:00 in the afternoon? This need not be exactly to the minute!





Thanks in advance.

When do certain flowers open and close?
Four O'clocks open in the afternoon. They're a member of the morning glory family. Moonflowers open in the evening - around dusk.