. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. MORE ABOUT POLLINATION 301 flowers are sessile. In addition to dandelion and daisy, the asters, the jgoldenrods, sunflowers, wild lettuce, thistle, burdock, and many other common weeds belong to the Composita. Though all Com- positcB have their flowers in heads, not all plants with heads are CompositcB. White and red clover have their flowers in heads, and they belong to the pea family (Leguminosm). The buttonbush and the sycamore also bear their flowers i
. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. MORE ABOUT POLLINATION 301 flowers are sessile. In addition to dandelion and daisy, the asters, the jgoldenrods, sunflowers, wild lettuce, thistle, burdock, and many other common weeds belong to the Composita. Though all Com- positcB have their flowers in heads, not all plants with heads are CompositcB. White and red clover have their flowers in heads, and they belong to the pea family (Leguminosm). The buttonbush and the sycamore also bear their flowers in heads. b. Determinate Inflorescences. — Of this type the cyme is the only one of importance. (See Figure 12 j.) It is illustrated by the geranium and by the syringa. In a cyme the terminal or central flower blossoms first, and after that only buds already formed open out into Fig. 122. — An umbel of milk- weed. Note that the pedicels all start from the same place. Note the whorl of bracts at the top of the peduncle. 64. More about Pollination. — Pollen escapes from the anthers which produce it. After its escape any one of a number of things may happen to it. It may be blown by the wind, it may be carried away by an insect, it may fall to the ground and perish. It may reach a stigma or it may not. Most of it does not. A. The Waste of Pollen. — For nearly all of the pollen which is produced there is no such thing as pollination; not one grain out of a hundred reaches a stigma. This "waste " of pollen is much greater in wind-pollinated plants than it is in insect-pollinated ones. The chance that a. 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 G. (John Gaylord), b. 1876. New York, American Book Co
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