. Beginners' botany. Botany. THE FL O WER — FER TILIZA 7 ION AND POLLINA TION 147. some of the anthers mature simultaneously with the pistils, so that there is chance for self-pollination in case for- eign pollen does not arrive. Even when the stigma receives pollen from its own flower, cross-fer- tilization may result. The hol- lyhock is proter- androus. Fig. 198 shows a flower recentlv Fig. 198. —Flower of Hollyhock; proterandrous. expanded. The center is occupied by the column of sta- mens. In Fig. 199, showing an older flower, the long styles are conspicuous. Some flowers are so constructe
. Beginners' botany. Botany. THE FL O WER — FER TILIZA 7 ION AND POLLINA TION 147. some of the anthers mature simultaneously with the pistils, so that there is chance for self-pollination in case for- eign pollen does not arrive. Even when the stigma receives pollen from its own flower, cross-fer- tilization may result. The hol- lyhock is proter- androus. Fig. 198 shows a flower recentlv Fig. 198. —Flower of Hollyhock; proterandrous. expanded. The center is occupied by the column of sta- mens. In Fig. 199, showing an older flower, the long styles are conspicuous. Some flowers are so constructed as to prohibit self-polli- nation. Very irregular flowers are usually of this kind. With some of them, the petals form a sac to inclose the anthers and the pol- len cannot be shed on the stigma but is retained until a bee forces the sac open; the pollen is rubbed on the hairs of the bee and transported. Regular flowers usu- ally depend mostly on dichogamy and the selective power of the pistil to insure crossing. Floivers that are very. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan company
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
