. Botany of the living plant. Botany; Plants. BOTANY OF THE LIVING PLANT t0 their tips, and a single stigma is the result, as in the Lily (Fig. 209) Datura (Fig. 214). Even here the receptive surface is lobed, and the number and position of the constituent carpels is indicated by that of the stigmatic lobes. From external observation this is often the readiest guide to the composition of the gynoecium. For instance, the two-lobed stigma of the Compositae accords with the facts of. *n9 Fig. 214. Stigma of Datura with pollen-grains adhering to its surface. (After Figuier.) development of their f
. Botany of the living plant. Botany; Plants. BOTANY OF THE LIVING PLANT t0 their tips, and a single stigma is the result, as in the Lily (Fig. 209) Datura (Fig. 214). Even here the receptive surface is lobed, and the number and position of the constituent carpels is indicated by that of the stigmatic lobes. From external observation this is often the readiest guide to the composition of the gynoecium. For instance, the two-lobed stigma of the Compositae accords with the facts of. *n9 Fig. 214. Stigma of Datura with pollen-grains adhering to its surface. (After Figuier.) development of their flowers, in which two carpels make their appear- ance (Fig. 198). In Datura the two lobes clearly indicate the two carpels of the Solanaceae. The roughness of the stigmatic surface is due to the outgrowth of the superficial cells as papillae (Fig. 214), the size of which is found to bear a relation to the size of the pollen-grains. The cells are thin- walled, with active protoplasts ; frequently they are moist, or secrete a sticky juice, which helps to detain the pollen-grains in contact with the surface. The grains themselves have sometimes a sticky exterior, which serves the same end. A still more important feature is that the style, by its elongation carries the stigma upwards to a level suitable for. 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 Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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Keywords: ., bookcentury1900, bookpublis, booksubjectbotany, booksubjectplants
