. Introduction to botany. Botany. Flowers. ^59. Fig. 83. IV, a crowded cyme or fascicle; x, a corymb; y, an umbel. of a corymb, whose older flowers differ from those of a raceme in having their pedicels elongated so that a some- what flat-topped flower cluster is produced, y stands for an umbel, having the pedicels of nearly equal length, and inserted at about the same height on the common axis. 2c represents a head of the corriposite type, and t a head of the clover type with the receptacle much exaggerated. The raceme, spike, corymb, umbel, and head are called indeterminate; they have this f
. Introduction to botany. Botany. Flowers. ^59. Fig. 83. IV, a crowded cyme or fascicle; x, a corymb; y, an umbel. of a corymb, whose older flowers differ from those of a raceme in having their pedicels elongated so that a some- what flat-topped flower cluster is produced, y stands for an umbel, having the pedicels of nearly equal length, and inserted at about the same height on the common axis. 2c represents a head of the corriposite type, and t a head of the clover type with the receptacle much exaggerated. The raceme, spike, corymb, umbel, and head are called indeterminate; they have this feature in common, that the older flowers are at the base or periphery, and the younger flowers are at the apex or center of the inflorescence. In another type of inflorescence known as the cyme {v and w) the terminal or central flower is the oldest. This sort of inflorescence is termed determinate, since the com- mon axis is not indefinite in elongation as in the raceme and spike. A compact cyme like that of the Sweet William is called -a. fascicle, and one that is still more compact so as to simulate a head is termed a glomerule. 127. Tie paper bags over flowers, so that neither wind nor insects can disturb them, and note whether they are able to achieve self-fertilization. 128. Before the stamens have discharged their pollen, remove them from a flower, and then by means of a camel's hair brush transfer to the stigma pollen from a flower of another plant of the same kind. Tie a bag over the flower. 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.
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