. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada . Botany; Botany; Botany. THE PISTILS, OB GYNECIUM. 107 525, Two MODES OP COHESION in the carpellary circle greatly affect the structure of the ovary and fruit. First and regularly, the carpels may be closed as when simple, and conjoined by their sides and fronts, as in lily and marsh mallow. In this case, 1, The compound ovary will have as many cells as carpels. 2, The partitions between the cells, i. e., the dissepiments (dissepio, to separate) will
. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada . Botany; Botany; Botany. THE PISTILS, OB GYNECIUM. 107 525, Two MODES OP COHESION in the carpellary circle greatly affect the structure of the ovary and fruit. First and regularly, the carpels may be closed as when simple, and conjoined by their sides and fronts, as in lily and marsh mallow. In this case, 1, The compound ovary will have as many cells as carpels. 2, The partitions between the cells, i. e., the dissepiments (dissepio, to separate) will each be double, will meet in the center, will be verti- cal and alternate with the stigmas. 3, The single carpel can have no true dissepiment. If any ever occur it is regarded as spuriovs, being a membranous expansion of the dorsal suture or the placentae, as in flax. 4, The placentae as well as the ventral suture will be axial, and the dorsal suture on the outer wall, opposite the stigmas. 626. Again, the carpels may each be open and conjoined by their edges, as the petals in a monopetalous corolla. So it is in the com- pound ovary of the violet, rock-rose. In this case, 1, There will be no dissepiment (unless spurious, as in the Cruciferas), and but one cell. 2, The placentae of each carpel will be separated and carried back to the wall of the ovary, i. e., they will become parietal (paries, a wall.) 521. INTEEMEDIATB CONDITIONS. Between the two conditions of axile (or cen- tral) and parietal plaoentse we find all degrees of transition, as illustrated in the different species of 'St. Jolin'swort, and in poppy, where the inflected margins of the carpels carry the placenta inward, well nigh to the axis. Moreover, the placentae are not always mere marginal lines, but. 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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