. Essentials of botany. Botany; Botany. TI-IE FLOWER OF THE HIGHER SEED-PLANTS 155 united and the stigmas separate or at least lobed, so as to show of how many carpels the pistil is made up (Figs. 99, 100). Even when there is no external sign to indicate the compound, nature of the pistil, it can usually be recognized from a study of a cross-section of the ovary. 184. Locules of the Ovary; Placentas. — Compound ovaries very commonly consist of a number of separate chambers known as locules. Fig. 113, B, shows a three- loculed ovary seen in cross- section. The ovules are not borne indiscriminat
. Essentials of botany. Botany; Botany. TI-IE FLOWER OF THE HIGHER SEED-PLANTS 155 united and the stigmas separate or at least lobed, so as to show of how many carpels the pistil is made up (Figs. 99, 100). Even when there is no external sign to indicate the compound, nature of the pistil, it can usually be recognized from a study of a cross-section of the ovary. 184. Locules of the Ovary; Placentas. — Compound ovaries very commonly consist of a number of separate chambers known as locules. Fig. 113, B, shows a three- loculed ovary seen in cross- section. The ovules are not borne indiscriminately .- —— , „ by any part of the lining of Fig. 113. Principal Types of Placenta, the ovary. In one-loculed ^, parietal placenta; i?, central placenta; pistils they frequently grow C', free central placenta; A and B,trans- ,. , Terse sections; C. longitudinal section. m a line running along one side of the ovary, as in the pea pod (Fig. 146). The ovule- bearing line is called a placenta; in compound pistils there are commonly as many placentas as there are separate carpels joined to make the pistil. Placentas on the wall of the ovary, like those in Fig. 113, A, are called parietal placentas; those which occur as at B, in the same figure, are said to be central; and those which, like the form rep- resented in C of the same figure, consist of a column rising from the bottom of the ovary are called free central placentas. 185. Superior, Half-Inferior, and Inferior Ovaries When, as in the flower of Fig. 98, the receptacle is rounded or club-shaped and the floral organs arise from it in suc- cessive sets, the flower is said to be hypogynous, from two Greek words, here applied to mean under the pistil, and the ovaries are said to be superior (Fig. 114, I).. 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 B
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