. Essentials of botany. Botany; Botany. 100. ESSENTIALS OF BOTANY Compare the mode of veining or venation of the elm and the maple leaf by making a diagram of each. These leaves agree in being nelted-ceined, i.e., in having veinlets that join each other at many angles, so as to form a sort of delicate lace-work, like Figs. 59 and 60. They differ, however, in the arrange- ment of the principal veins. Such a leaf as that of the elm is said to be feather- veined, or pinnately veined. The maple leaf, or any leaf with closely similar venation, is said to be palmately veined. Describe the difference
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. Essentials of botany. Botany; Botany. 100. ESSENTIALS OF BOTANY Compare the mode of veining or venation of the elm and the maple leaf by making a diagram of each. These leaves agree in being nelted-ceined, i.e., in having veinlets that join each other at many angles, so as to form a sort of delicate lace-work, like Figs. 59 and 60. They differ, however, in the arrange- ment of the principal veins. Such a leaf as that of the elm is said to be feather- veined, or pinnately veined. The maple leaf, or any leaf with closely similar venation, is said to be palmately veined. Describe the difference between the two plans of venation. 117. Relation of Venation to Shape of Leaves.—As soon as the student begins to observe leaves somewhat widely, - he can hardly fail to notice that there is a general rela- tion between the plan of venation and the shape of the leaf. How may this relation be stated? In most cases the principal veins follow at the outset a pretty straight course, a fact for which the student ought to be able to give a reason after he has per- formed Exp. XVI. On the whole, the arrangement of the veins seems to be such as to stiffen the leaf most- in the parts that need most support, and to reach the region near the margin by as short a course as. Fig. 62. Palmately Divided Leaf of Buttercup.. 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 work.. Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn