. Cyclopedia of farm crops. Farm produce; Agriculture. faster than another, so that the tip circles in the same direction as the hands of a watch, to the right, or with the sun (as in the hop), or in the opposite direction (as in the morning-glory). Such plants unwind and reverse their direction if placed upside down, and they will not twine on a horizontal or nearly horizontal support. Tiie flower.—When the work of root, stem and leaf has stored a sufficient surplus of food, the plant proceeds to flower. The century plant spends many years in this process ; trees usually take four or five yea
. Cyclopedia of farm crops. Farm produce; Agriculture. faster than another, so that the tip circles in the same direction as the hands of a watch, to the right, or with the sun (as in the hop), or in the opposite direction (as in the morning-glory). Such plants unwind and reverse their direction if placed upside down, and they will not twine on a horizontal or nearly horizontal support. Tiie flower.—When the work of root, stem and leaf has stored a sufficient surplus of food, the plant proceeds to flower. The century plant spends many years in this process ; trees usually take four or five years or more ; biennials, as the beet and turnip, require two, while annuals complete their preparation in a few days or weeks. The food is stored in roots, tubers, root- stocks, stems, or in modified leaves such as we find in bulbs. In the latter , the fully formed minia- ture can often be seen on cutting open the bulb. The flower is usu- ally spoken of as a modified branch. In their early stages, flower-buds are so much like leaf-buds that they cannot be told apart. But the growing leaf-bud pro- duces leaves that soon become separated by the elongation of the stem, while in the flower-bud they remain crowded to- gether, and become modified into dissimilar struc- tures. The outermost set of these structures, the calyx (Fig. 14), consists of green, leaf-like sepals whose function is to protect the internal parts, much as the outer leaves of a bud protect the innermost. comes the corolla, consisting of petals, which are leaf-like except in color. Instead of chloro- phyll they possess a number of pigments that are either held in solution in the cell sap or appear in solid form. These, by their combination, produce an endless variety of coloration. The appearance of white petals is due (like that of snow) to the presence of air. The next set of organs, the stamens, often have a leaf-like basal part, while the upper part pro- duces an anther, i. e., a .structure
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectagriculture, bookyear
