. Elements of botany. Botany. THE FLOWER OF THE HIGHER SEED-PLAXTS united and the stigmas separate or at least loLed, so as to show of how many carpels the pistil is made up (Figs. 99, 100). Even when tliere is no external sign to indicate tlie compound nature of the pistih 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 ^^~^T~^
. Elements of botany. Botany. THE FLOWER OF THE HIGHER SEED-PLAXTS united and the stigmas separate or at least loLed, so as to show of how many carpels the pistil is made up (Figs. 99, 100). Even when tliere is no external sign to indicate tlie compound nature of the pistih 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 ^^~^T~^ ^^~'b~' ' c by any part of the lining of Fh:. 113. Principal Types of Placenta, the ovary. In one-loculed j, parietal placenta; B, central placenta; pistils they frequentlv grow ''^ free central placenta ; A and /;.trans- . '' verse sections ; C, longitudinal section. m a line running along one side of the ovary, as in the pea pod (Fig. 14G). The ovule- bearing line is called ^ jjlaeenta; 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 risinff from the bottom of the ovarv are called free central pilacentas. 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
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1904
