How the Plant Produces Seed . same flower, in many cases they are not ripened at the same time, sothat as far as pollination is concerned the situation is much the sameas if a single flower had only one kind of organ. In the flowers of thefirst kind, in which stamens and pistils are present together, the transferof pollen from stamen to stigma would not appear to be a difficult matter,but in the case of stamens and pistils borne in different flowers, or evenon different plants, pollinationbecomes a serious problem. Solu-tion of this problem is of courseof vital importance to the plants,because
How the Plant Produces Seed . same flower, in many cases they are not ripened at the same time, sothat as far as pollination is concerned the situation is much the sameas if a single flower had only one kind of organ. In the flowers of thefirst kind, in which stamens and pistils are present together, the transferof pollen from stamen to stigma would not appear to be a difficult matter,but in the case of stamens and pistils borne in different flowers, or evenon different plants, pollinationbecomes a serious problem. Solu-tion of this problem is of courseof vital importance to the plants,because of the part played bypollination in the process of repro-duction. The following examplesshow how the problem has beensolved in a few cases. In many land plants the pollenis carried from the stamens to thestigmas of other flowers by aircurrents. The pollen grains are sosmall that they form a fine, dust-like powder, and may be carriedmany miles by the wind. Thiswind pollination occurs in manycommon plants, such as grasses(fig.
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