. Elements of botany. Botany. 100 ELEMENTS 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 iu being netled-veined, , in having veinlets that join each other at many angles, so as to form a sort of delicate lace-work, like Figs. .59 and (JO. 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 pinnalehj veined. The maple leaf, or any leaf with closely similar venation, is said to be pedmalely veined. Describe the difference between th
. Elements of botany. Botany. 100 ELEMENTS 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 iu being netled-veined, , in having veinlets that join each other at many angles, so as to form a sort of delicate lace-work, like Figs. .59 and (JO. 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 pinnalehj veined. The maple leaf, or any leaf with closely similar venation, is said to be pedmalely 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 \ ^ \ some w li a t widely, he can hardly fail to notice that there is a general rela- tion betvs'een 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 ontset a pretty straight course, a fact for which the student ought to be aljle to give a reason after he has per- formed Exp. XYI. <.)n 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. Fifi. r,2. Palmately Divided Leai 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 Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn
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