. Plant studies; an elementary botany. Botany. Fig. 136. Yucca and Pronuba. In the lower figure to the right an opened flower shows the pendent ovary with the stigma region at its apes. The upper figure to the right shows the position of Pronuba when collecting pollen. The figure to the left represents a cluBter of capsules of Tueca, which shows the perforations made by the larva? of Pronuba in escaping.—After Rilet and Trelease. of their own length, and a transfer of pollen from flower to flower is necessary. 90. Self-pollination.—In considering these three general methods of preventing self-
. Plant studies; an elementary botany. Botany. Fig. 136. Yucca and Pronuba. In the lower figure to the right an opened flower shows the pendent ovary with the stigma region at its apes. The upper figure to the right shows the position of Pronuba when collecting pollen. The figure to the left represents a cluBter of capsules of Tueca, which shows the perforations made by the larva? of Pronuba in escaping.—After Rilet and Trelease. of their own length, and a transfer of pollen from flower to flower is necessary. 90. Self-pollination.—In considering these three general methods of preventing self-pollination, it must not be sup- posed that self-pollination is never provided for. It is pro- vided for more extensively than was once supposed. It is found that many plants, such as violets, in addition to the usual showy, insect-pollinated flowers, produce flowers that are not at all showy, in fact do not open, and are often not prominently placed. The fact that these flowers are often closed lias suggested for them the name cleistogamous. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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