. The anatomy of woody plants. Botany -- Anatomy. THE HERBACEOUS DICOTYLEDONS 395 magnified image of a part of the transverse aspect of the stem, making clearer the relations of the leaf trace to the large foliar ray. It is apparent that the ray is similar to that found in oaks in cooler climates and that it has a like relation to the leaf trace. In c is shown a diagram of Vitis, illustrating the relations of large rays and foliar traces. The cylinder in this instance shows only a single annual ring, and the rays subtending the leaf trace in transverse section are consequently less deep in the
. The anatomy of woody plants. Botany -- Anatomy. THE HERBACEOUS DICOTYLEDONS 395 magnified image of a part of the transverse aspect of the stem, making clearer the relations of the leaf trace to the large foliar ray. It is apparent that the ray is similar to that found in oaks in cooler climates and that it has a like relation to the leaf trace. In c is shown a diagram of Vitis, illustrating the relations of large rays and foliar traces. The cylinder in this instance shows only a single annual ring, and the rays subtending the leaf trace in transverse section are consequently less deep in the radial direction than those of Leea. Further, in the facial aspect of the cylinder the leaf rays are seen to be much elongated below and separated by a median process of wood into pairs of rays. This situation is strikingly unlike that in the shallow foliar rays of Leea. Still another con- trast to the exotic genus is offered by the absence of uniseriate rays except in the actual leaf trace, an interesting exemplification of the persistence of primitive characters in foliar organs. A more highly magnified view (d) of a segment of the transverse aspect of the cylinder makes clear the presence of uniseriate rays in the leaf trace and their absence in the adjoining parts. We may now pass conveniently to the diagrammatic comparison of the topographical relations presented by thicker and thinner annual stems of Vitis. In Fig. 274(1 is shown a view of a thicker axis from the surface of attachment of a leaf at the median node. The upper part of the figure shows a transverse view of the stem. FIG. 272.—Transverse section of part of a thin axis of Vitis. Explanation in the 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
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