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Floral rewards: nectar vs. pollen
Evolution of pollination systems within a particular group may involve novelties in the floral reward offered to pollinators. Freitas and Sazima (pp. 311-317) examine the pollen-flowers of two Brazilian species of violets, a genus that typically forms nectar-producing flowers. The authors discuss how natural selection might favour pollen instead of nectar as a floral reward in this group.
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