. Flower ecology. Plant ecology; Fertilization of plants. 92 ment of the conspicuous flowers and also because insects failed to pollinate the flowers during bad FIG, 37. Figr. 37. CleistogramouK flower of Lamium amptextcatde. (After Lub- buok). PIG. 37 A. Fig. 37 A. Section of cleiatogamoHS flower of dead nettle (Lamium amplexi- caule). (After Lubbuck.) Arlstolochiaceae. Birthwort (Aristolochia clematitis) is an example of flowers pollinated by small flies; the arrangement is quite unique. The yellow flowers are arranged in whorls. The long, tubular flowers consist of a wide, funnel-
. Flower ecology. Plant ecology; Fertilization of plants. 92 ment of the conspicuous flowers and also because insects failed to pollinate the flowers during bad FIG, 37. Figr. 37. CleistogramouK flower of Lamium amptextcatde. (After Lub- buok). PIG. 37 A. Fig. 37 A. Section of cleiatogamoHS flower of dead nettle (Lamium amplexi- caule). (After Lubbuck.) Arlstolochiaceae. Birthwort (Aristolochia clematitis) is an example of flowers pollinated by small flies; the arrangement is quite unique. The yellow flowers are arranged in whorls. The long, tubular flowers consist of a wide, funnel-shaped throat and a long and narrow tube which is lined with stifle hairs. The lower part is enlarged and contains the stamens and part of the pistil. In Aristolo- chia ringens the calyx has developed a lower and upper lip. In the birthwort there is a flattened expansion which serves as a resting place for insects. The colors as well as the disa- greeable odor make these flowers attractive to certain kinds of insects. Flies find no difliiculty in going into the flower, since the hairs all point in an oblique direction away from the opening. When the insect reaches the expansion it is comfortably housed. The temperature is several degrees warmer than the surrounding air. They now try to escape, and in doing so come in contact with the stigma where they leave some pollen from other flowers, but they cannot es-. 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 Pammel, Louis Herman, 1862-1931. [n. p. ] Press of J. B. Hungerford
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectfertili, bookyear1898
