. The anatomy of woody plants. Botany -- Anatomy. FIG. 278.—Slender upper region of the stem of H. hirsutiis. going, but the topography is strikingly different. Here the foliar traces, instead of merely standing flush with the surface of the cylinder, as in the upper region of the more woody herbace- ous types, are actu- ally outstanding, or salient. As a conse- quence of this situa- tion the leaf traces no longer correspond to depressions of the stem, but actually underlie ridges on its surface. This condi- tion is, in fact, highly characteristic of ex- treme herbs, in which the leaf trace ha
. The anatomy of woody plants. Botany -- Anatomy. FIG. 278.—Slender upper region of the stem of H. hirsutiis. going, but the topography is strikingly different. Here the foliar traces, instead of merely standing flush with the surface of the cylinder, as in the upper region of the more woody herbace- ous types, are actu- ally outstanding, or salient. As a conse- quence of this situa- tion the leaf traces no longer correspond to depressions of the stem, but actually underlie ridges on its surface. This condi- tion is, in fact, highly characteristic of ex- treme herbs, in which the leaf trace has become the dominant factor in the organization of the cylinder of the axis. This ana- tomical situation corresponds to a very high degree of assimilative effi- ciency on the part of foliar organs, result- ing in a large amount of food storage or seed pro- duction, as the case may be. In Fig. 279 is shown the trace of • the herbaceous re- FIG. showing the leaf trace in the Sion m°re highly herbaceous region of Helianthus. magnified. 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 Press
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