The Virginia spring beauty has pale pink flowers that close at night. California poppies also exhibit this behavior, but they are most often yellow or orange (some breeders have selectively bred for specific colors). Hibiscus flowers, which can be a range of colors including pink, also remain open during the day and close shortly after sunset. Some people speculate that these plants close their flowers at night in order to save pollen since most pollinating insects are dormant in the absence of daylight.
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