. Introduction to botany. Botany. 188 Introduction to Botany. its long proboscis to the bottom of the tube and secures the nectar; and while it is tarrying briefly at each flower, keeping itself poised by the swift vibration of its wings, it is pretty certain to touch with its proboscis both anthers and stigmas, which stand close together at about the same height near the mouth of the corolla. Both cross and self. Fig. 104. Sphinx moth and flower of Datura stramonium, posed to show the relative lengths of the flower and of the moth's proboscis. Reduced rather more than one-half. pollination mi
. Introduction to botany. Botany. 188 Introduction to Botany. its long proboscis to the bottom of the tube and secures the nectar; and while it is tarrying briefly at each flower, keeping itself poised by the swift vibration of its wings, it is pretty certain to touch with its proboscis both anthers and stigmas, which stand close together at about the same height near the mouth of the corolla. Both cross and self. Fig. 104. Sphinx moth and flower of Datura stramonium, posed to show the relative lengths of the flower and of the moth's proboscis. Reduced rather more than one-half. pollination might be brought about in this way, but, as Darwin has shown, the foreign pollen would probably possess the greater potency, and cross fertilization would be apt to result. Figure 104 is a photograph of a sphinx moth and Datura flower, posed to show the relative lengths of the moth's proboscis and the corolla tube. 138. Cross Pollination of Salvia.—In the Salvias, or sages, we find several contrivances working together for a common end. The corolla is tubular below and two- Hpped above, the lower lip serving as an alighting place for bees, and the upper forming a protective covering for the stamens and style. There are two stamens of peculiar construction set one on either side of the mouth of the. 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 Stevens, William Chase, 1861-. Boston, D. C. Heath & Co.
Size: 2336px × 1069px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1902
