. The anatomy of woody plants. Botany -- Anatomy. THE EQUISETALES (INCLUDING SPHENOPHYLLALES) 271 evolutionary interest. In Equisetum arvense (Fig. 1956), in all probability one of the most highly specialized members of the group, an external endodermis alone is for the most part present, an internal boundary of this nature being found only in certain instances in the region of the nodes. In E. silvaticum, which may be considered a somewhat less specialized type, only an external endodermis ap- pears in the aerial stem, which accordingly presents a condition very similar to that found in E. ar
. The anatomy of woody plants. Botany -- Anatomy. THE EQUISETALES (INCLUDING SPHENOPHYLLALES) 271 evolutionary interest. In Equisetum arvense (Fig. 1956), in all probability one of the most highly specialized members of the group, an external endodermis alone is for the most part present, an internal boundary of this nature being found only in certain instances in the region of the nodes. In E. silvaticum, which may be considered a somewhat less specialized type, only an external endodermis ap- pears in the aerial stem, which accordingly presents a condition very similar to that found in E. arvense. In the subterranean stems, however, and in primitive. 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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