What types of flowers bloom at night?

Morning Glory, Crocus, Bloodroot, Hedgehog Cactus, Sun Daisies just to name a few. When flowers close temporarily for the night they are effectively in standby mode, protecting their delicate reproductive parts and pollen while they are not in use. The pollen is isolated from the dew that forms during the night, keeping it dry so that it can be dusted onto a passing insect the following day. Closing the flowers also helps to protect against night-time cold and bad weather.