The Effects of Cross and Self-Fertilisation in the Vegetable Kingdom

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The Introductory Remarks begin: "There is weighty and abundant evidence that the flowers of most kinds of plants are constructed so as to be occasionally or habituallycross-fertilised by pollen from another flower, produced either by the same plant, or generally, as we shall hereafter see reason to believe, by a distinct plant. Cross-fertilisation is sometimes ensured by the sexes being separated, and in a large number of cases by the pollen and stigma of the same flower being matured at different times. Such plants are called dichogamous, and have been divided into two sub-classes: proterandrous species, in which the pollen is mature before the stigma, and proterogynous species, in which the reverse occurs; this latter form of dichogamy not being nearly so common as the other."画面が切り替わりますので、しばらくお待ち下さい。
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