. Our native trees and how to identify them; a popular study of their habits and their peculiarities. Trees. FORM AND STRUCTURE MARGINAL INDENTATIONS. A distinction is made between indentations that are shallow and those that are deep. Of shallow indentations the fol- lowing forms prevail in the leaves of deciduous trees : Serrate, saw-toothed, with sharp teeth which incline toward the apex ; distinguished as fine and coarse. (Fig. 27.) Bi-serrate, doubly serrate, with two sets of teeth one upon the other. (Fig. 28.). Figs. 27. Dentate, toothed with outwardly projecting teeth; distin- guished
. Our native trees and how to identify them; a popular study of their habits and their peculiarities. Trees. FORM AND STRUCTURE MARGINAL INDENTATIONS. A distinction is made between indentations that are shallow and those that are deep. Of shallow indentations the fol- lowing forms prevail in the leaves of deciduous trees : Serrate, saw-toothed, with sharp teeth which incline toward the apex ; distinguished as fine and coarse. (Fig. 27.) Bi-serrate, doubly serrate, with two sets of teeth one upon the other. (Fig. 28.). Figs. 27. Dentate, toothed with outwardly projecting teeth; distin- guished as fine and coarse. (Fig. 29.) Crenate, scalloped, the teeth broad and rounded. (Fig. 30.) Undulate, when the margin forms a wavy line. (Fig. 31.) Sinuate, deeply wavy. (Fig. 32.) Eepand, margin like that of an opened umbrella. (Fig. 33.) Spinose, margin spiny. (Fig. 34.) The common forms of deeply indented margins found in the leaves of trees are Lobed and Cleft. Lobed, when the indentations extend nearly half-way to the midrib or base, and the segments or sinuses or both may be either rounded or acute. The Oak and the Maple leaves are examples. Cleft, when the sinuses are deep, narrow, and acute. 509. 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 Keeler, Harriet L. (Harriet Louise), 1846-1921. New York, C. Scribner's Sons
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