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By hermaphrodite plants with incomparably greater certainty by self-fertilisation than by the union of the sexual elements belonging to two distinct flowers or plants. Yet it is as unmistakably plain that innumerable flowers are adapted for cross-fertilisation as that the teeth and talons of a carnivorous animal are adapted for catching prey; or that the plumes wings and hooks of a seed are adapted for its dissemination. Flowers therefore are constructed so as to gain two objects which are to a certain extent antagonistic and this explains many apparent anomalies in their structure. The close proximity of the anthers to the stigma in a multitude of species favours and often leads to self-fertilisation; but this end could have been gained far more safely if the flowers had been completely closed for then the pollen.
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