Читать книгу Principles of Plant Genetics and Breeding - George Acquaah - Страница 245

Some flowers are complete (possess all the four basic parts) while others are incomplete (are missing one or more of the four basic floral parts). Furthermore, in some species, the sexes are separate. When separate male and female flowers occur on the same plant, the condition is called monoecy. Sometimes, the male and female flowers occur in different kinds of inflorescence (different locations as in corn). Other examples of monoecious plants include most figs, birch, and pine trees. It is easier and more convenient to self‐pollinate plants when the sexes occur in the same inflorescence. In terms of seed production, monoecy and dioecy may appear to be inefficient because not all flowers produce seed. Some flowers produce only pollen.