. A compendium of general botany. Plants. Fig. 99. Fig. 100 B. a spiral arrangement of the leaves (see Fig. 100 B, diagramatic apical view). In still other cases the halves of each segment (either side by side or above each other) may develop leaves or branches. (Leftgeb has studied the development of the mosses more par- ticularly.) In regard to the position, inclusive of the succession of develop- ment, of lateral organs we may distinguish the following cases: I. Organs are in'egnlar as to origin and position. Example: trichomes upon other organs. II. The origin and position of organs may be
. A compendium of general botany. Plants. Fig. 99. Fig. 100 B. a spiral arrangement of the leaves (see Fig. 100 B, diagramatic apical view). In still other cases the halves of each segment (either side by side or above each other) may develop leaves or branches. (Leftgeb has studied the development of the mosses more par- ticularly.) In regard to the position, inclusive of the succession of develop- ment, of lateral organs we may distinguish the following cases: I. Organs are in'egnlar as to origin and position. Example: trichomes upon other organs. II. The origin and position of organs may be in longitudinal rows, as is the case in secondary roots formed from the perieam- bium. The number of rows is dependent upon the number of primordial xylem-groups. The succession of their development is, as a rule, acropetally, therefore the youngest branch is always nearest the apex of the root. Longitudinal rows of lateral organs, such as secondary roots and leaves, also occur in creeping (" dorsiventral ") organs. III. Frequently organs originate and are arranged in whorls, as is seen in the case of leaves and branches. Two or more lateral. 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
