Cycads are the most primitive living seed-plants. Studying on the pollination biology of cycads has significant value for researching into the origin, phylogeny of seed plants, the evolution of dependent mutualism between the insects and cycads, as well as the mechanism of reproduction and the mechanism of endanger. In this review, we summarize the information available concerning the pollination biology of cycad, including morphology and structure of male and female cone, floral phenology of male and female plants, the medium of pollination and the mechanism of pollination. For future research, we suggested that more studies should be carried out on the pollination of cycad (especially for the Cycas) in a wider range, and the exclusion method should be conducted to determine the medium of pollination of cycad more widely, and more detailed studies should be done about the problem of that insect is in highly specialized dependent mutualisms with cycads.
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