. Botany; an elementary text for schools. Plants. 266. Some flowers have so developed as to prohibit self- pollinatio)). Very irregular flowers are usually of this cate- gory. Regular flow- ers usually depend on dichogamy and the selective power of the pistil to in- sure crossing. Floiv- ers ivhich are very irregular and pro- vided with nectar and strong perfume are usually pollinated by insects. Gaudy col- oider flower of hoUyhock. qys probably attract insects in many cases, but perfume appears to be a greater attraction. The insect visits the flower for the nectar (for the making of honey) a
. Botany; an elementary text for schools. Plants. 266. Some flowers have so developed as to prohibit self- pollinatio)). Very irregular flowers are usually of this cate- gory. Regular flow- ers usually depend on dichogamy and the selective power of the pistil to in- sure crossing. Floiv- ers ivhich are very irregular and pro- vided with nectar and strong perfume are usually pollinated by insects. Gaudy col- oider flower of hoUyhock. qys probably attract insects in many cases, but perfume appears to be a greater attraction. The insect visits the flower for the nectar (for the making of honey) and may unknowingly carry the pollen. Spurs and sacs in the flower are nectaries, but in spurless flowers the nectar is usually secreted in the bottom of the flower-cup. Flowers which are polli- nated by insects are said to be entomophilous ("insect loving"). Fig. 208 shows a larkspur. The en- velopes are sepa- rated in Fig. 209. The long spur at once suggests in- sect pollination. project into this spur, apparently serving to guide th^. 208. Flower of larkspur. The spur is a sepal. 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, Macmillan Co.
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