. Outlines of plant life : with special reference to form and function . Botany. 104 OUTLINES OF PLANT LIFE. intervals between the larger ribs, but the blade is made up of a series of independent portions united to a common stalk. Each ultimate branch of the blade is known as a leaflet. Blades in which the green tissue is continuous, even • though deeply divided, are. B Fig. g6. Fig. 97. Fig. g6.—Diagrams ot slight leaf branching. .<4, leaf with crenate edge; 5, leaf with dentate edge; C, leaf with serrate edge. —After Bessey. Fig. 97—Leaf of Amorpko/i/iallus, s^xovrmg sympodial branching.
. Outlines of plant life : with special reference to form and function . Botany. 104 OUTLINES OF PLANT LIFE. intervals between the larger ribs, but the blade is made up of a series of independent portions united to a common stalk. Each ultimate branch of the blade is known as a leaflet. Blades in which the green tissue is continuous, even • though deeply divided, are. B Fig. g6. Fig. 97. Fig. g6.—Diagrams ot slight leaf branching. .<4, leaf with crenate edge; 5, leaf with dentate edge; C, leaf with serrate edge. —After Bessey. Fig. 97—Leaf of Amorpko/i/iallus, s^xovrmg sympodial branching. The successive lateral axes are numbered in order. The extent of branching makes the blade divided. Reduced. - After Sachs. called jzw/i/e leaves. (See figs. 87, 89, 92, 96, 97.) Those which are branched into distinct leaflets are called compound leaves. (See figs. 90, 95.) 129. Venation.—The ribs and veins, being composed in part of the vascular strands which enter the leaf, and in part of stiffening mechanical tissues, branch profusely and in such a way that no part of the green tissue is far from a vein. In figures 98 and 99, though none of the finest branches are shown, some idea of the complete distribution of the veins may be obtained. The branching of the ribs and veins agrees in the main with the differ- ent modes described for the shoot, ^ 89, which see. A formal account of venation may be found in Gray's Structural Botany, pp. 90-94. 130. Special forms,—Foliage leaves may be modified to serve special purposes without wholly losing their function. 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 Barnes, Charles Reid, 1858-1910. New York : Henry Holt and Company
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