. The anatomy of woody plants. Botany -- Anatomy. EVOLUTIONARY PRINCIPLES OF THE COMPOSITAE 441 involucral scales. Certain dark dots on the superior margin of the upper bundles indicate the presence of oil canals. Structures of this nature are entirely lacking in the axial bundles and in the traces which have only recently left the cylinder of the stem. Fig. 305 will serve to demonstrate the truth of the statement just made. In a is shown a strand near the axial region which obviously is not characterized by the presence of oil canals. In b, on the contrary, representing a trace destined to an
. The anatomy of woody plants. Botany -- Anatomy. EVOLUTIONARY PRINCIPLES OF THE COMPOSITAE 441 involucral scales. Certain dark dots on the superior margin of the upper bundles indicate the presence of oil canals. Structures of this nature are entirely lacking in the axial bundles and in the traces which have only recently left the cylinder of the stem. Fig. 305 will serve to demonstrate the truth of the statement just made. In a is shown a strand near the axial region which obviously is not characterized by the presence of oil canals. In b, on the contrary, representing a trace destined to an involucral. FIG. 305.—a, axial strand of infloresence of C. Scolymus; b, a strand of an invo- lucral scale in the same. scale, a series of somewhat imperfectly developed oil canals appears along the upper margin. The Cynareae represent a transition anatomically from the Tubuliflorae to the Liguliflorae. In the Cichoriae, on the other hand, we have to do with very typical representatives of the Liguliflorae, since in this subfamily all the florets are strap-shaped and the secretion is milky in its nature and contained in the region of the phloem. Interestingly enough in the oyster plant (Trago- pogoti] and in the salsifies (Scorzonera and Scolymus) vestiges of. 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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