Ecological interactions between flowers and pollinators greatly affect the plant reproductive success. To facilitate these interactions, many flowers are known to display their attractive qualities in a rhythmic fashion. In this issue, Hou et al. found that Trifolium repens could increase reproductive fitness by accurate pollination. The most suitable flower angle saved pollinators' visiting energy and enabled them to obtain the highest nectar rewards (nectar secretion and number of pollen grains). This coordination between plants and pollinators maximized the interests of them, which is a crucial factor in initiating specialized plant-pollinator relationships.
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