. A compendium of general botany. Plants. Fig. 156. — Cross- section through the ovary of Paris quadrifo- Ua. (After Krass and Lan- dois.) Fig. 157.—Ovary of Atropa Bellddonna. A. LoDKitudinal section ; B, cross- section. (After Krass and Lan- dois.) Fig, 158.—Central placenta of Pri- mula officinalis, with the ovules removed. (After Berthold and Landois.) gynoecium of Paris quadrifolia ; it is usually known as a " four- chambered ; Fig. 157 shows the polymerous syncarpous. {two-chamlered) gynoecium of Atropa Belladonna. The manner in which the carjiellary leaf-margins are unit
. A compendium of general botany. Plants. Fig. 156. — Cross- section through the ovary of Paris quadrifo- Ua. (After Krass and Lan- dois.) Fig. 157.—Ovary of Atropa Bellddonna. A. LoDKitudinal section ; B, cross- section. (After Krass and Lan- dois.) Fig, 158.—Central placenta of Pri- mula officinalis, with the ovules removed. (After Berthold and Landois.) gynoecium of Paris quadrifolia ; it is usually known as a " four- chambered ; Fig. 157 shows the polymerous syncarpous. {two-chamlered) gynoecium of Atropa Belladonna. The manner in which the carjiellary leaf-margins are united sometimes brings the margins nearly to the middle of the cavity of the ovary. This produces what is known as axillary placentatioov (Figs. 156 and 157), which is very common. More rarely the margins project little or not at all into the cavity of the ovary, when it is known as parietl placentation ( Violacecej. There are also intermediate forms of placentation which produce the incom- pletely many-chambered ovaries {Papaver). The so-called central placentation (for example, of the Primulacece; see Fig. 158) is not well understood from a morphological standpoint. It seems as though the floral axis (torus) produced the ovules. It is, however, possible that a caulome may develop ovaries.' The Position and Form of Ovaries.—An ovule is said to be atropous {prihotropous) or straight when it forms a direct con- tinuation with its stalklet or funiculus. The ovule is said to be anatropous when the funiculus extends along and is adherent to the 1 For fear that this statement may be misleading I will state that a caulome, as such, icill 7iever produce ovaries.— 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 Westermaier, Max; Schneider, Albert, 1863-1928. New York : Wiley
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1896
