. The anatomy of woody plants. Botany -- Anatomy. THE HERBACEOUS DICOTYLEDONS 391 lie on either side of the trace. The leaf trace thus illustrates in the genus Vitis the conservative character which has been asserted for it on earlier pages. The most interesting feature presented by Fig. 2joa is, however, the fact that the leaf trace is subtended externally by a broad mass of parenchyma which on its flanks passes inwardly into the broad rays, separating the foliar segment from its neighbors on either hand. The situation in a general. FIG. 268.—a, transverse section of leaf ray in Leea; b, vert
. The anatomy of woody plants. Botany -- Anatomy. THE HERBACEOUS DICOTYLEDONS 391 lie on either side of the trace. The leaf trace thus illustrates in the genus Vitis the conservative character which has been asserted for it on earlier pages. The most interesting feature presented by Fig. 2joa is, however, the fact that the leaf trace is subtended externally by a broad mass of parenchyma which on its flanks passes inwardly into the broad rays, separating the foliar segment from its neighbors on either hand. The situation in a general. FIG. 268.—a, transverse section of leaf ray in Leea; b, vertical section of leaf ray in Leea. way, in fact, duplicates that found in the case of Leea, except that primitive rays are confined to the traces proper in Vitis and the broad ray subtending the trace is very much shortened in its radial dimension. Fig. 2706 shows the same trace in a lower section or, in other words, considerably below the node. Here the broad ray facing or confronting the leaf trace has disappeared, having been gradually replaced by typical woody tissues, con- sisting of septate fibers and vessels. As a consequence of this situation the flanking rays are now separately continuous to the outside of the cylinder and are not united by a broad tangential. 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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