. The anatomy of woody plants. Botany -- Anatomy. THE STEM 185 compound and primitive rays. In shrubby representatives of the genus Vitis occurring in the southwest region of the United States there is sometimes present the same mode of organization of the rays as characterizes the stem of Leea figured above. In more northern species of Vitis, however, a very different situa- tion presents itself—namely, that found in Fig. 138. Here the only rays present are of the compound type. An interesting. FIG. 138.—Diagram of the organization of the stem in a northern species of Vitis light is thrown on
. The anatomy of woody plants. Botany -- Anatomy. THE STEM 185 compound and primitive rays. In shrubby representatives of the genus Vitis occurring in the southwest region of the United States there is sometimes present the same mode of organization of the rays as characterizes the stem of Leea figured above. In more northern species of Vitis, however, a very different situa- tion presents itself—namely, that found in Fig. 138. Here the only rays present are of the compound type. An interesting. FIG. 138.—Diagram of the organization of the stem in a northern species of Vitis light is thrown on the situation by the consideration of the seed- ling in the genus Vitis. Fig. 139 presents the stem of the young individual. There are seen masses of wood representing leaf traces still in position in the woody cylinder of the stem. The segments under consideration are clearly bounded on either side by compound rays, while in the wood are present distinct vestiges of primitive rays. It is evident that, if the anatomy of the seedling has any clear bearing on the problem of the origin of the type of stem presented in our northern species of grapevine, primitive rays were once present in the intervals of wood bounded laterally by the large or compound rays, and that these have subsequently been. 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 Jeffrey, Edward C. (Edward Charles), b. 1866. Chicago, Ill. , The University of Chicago Press
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