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 27 wind and bee pollination DHJanzen101042.jpg high resolution
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| Willow flowers (Salix spp., Salicaceae) are a nice example of intermediacy. Opening very early in the spring when there is much wind and not much interference from leaves, the pollen is frequently carried from willow to willow by wind. However, as soon as the air is warm enough, willow pollen and nectar is also often collected by solitary bees (as well as by the honey bee pollen predator in this image) and in the process bee-pollinated. It is easy to imagine the natural selection circumstances that would push Salix into being more wind-or more bee-pollinated. | ||
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