. Introduction to structural and systematic botany, and vegetable physiology. Botany. that, if the contiguous parts of a whorl of three or more closed car- pels cohere, the resulting compound ovary will have as many cavi- ties, or cells, as there are carpels in its composition, and the placentae (one in the inner angle of each carpel) will all be brought together in the axis of the compound pistil. And the partitions, or Dissep- iments, which divide the compound ovary into cells, manifestly consist of the united contiguous portions of the walls of the carpels. These necessarily are composed of
. Introduction to structural and systematic botany, and vegetable physiology. Botany. that, if the contiguous parts of a whorl of three or more closed car- pels cohere, the resulting compound ovary will have as many cavi- ties, or cells, as there are carpels in its composition, and the placentae (one in the inner angle of each carpel) will all be brought together in the axis of the compound pistil. And the partitions, or Dissep- iments, which divide the compound ovary into cells, manifestly consist of the united contiguous portions of the walls of the carpels. These necessarily are composed of two layers, one belonging to each carpel; and in ripe pods they often split into the two layers. True dissepiments must always be equal in number to the carpels of which the compound pistil is composed. 550. In certain cases, indeed, there are addi- *°° tional partitions, ov fake dissepiments. These are commonly projec- FIG. 496. Pistil of a Saxifrage, composed of two carpels or simple pistils united below, but distinct above ; cut across both above and below. PIG. 497. Pistil of common St. Johnswort, of three united ovaries ; their styles distinct. FIG. 498. The same of another species of St. Johnswort (Hypericum prolificum,), the styles also united into one, which, bowever, split apart in the fruit. riG. 499. Pistil of Tradescantia or Spiderwort, even the three stigmas united into one. The ovary in all cut across to show the internal structure. FIG. 500. Cross-section of a flower of Flax; each of the five cells of the ovary partly divided by on imperfect false partition from the 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 Gray, Asa, 1810-1888. New York [etc. ] Ivison, Blakeman, Taylor & Co.
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1850, booksubjectbotany
