. Essentials of botany. Botany; Botany. leafy twig, by a twisting about of the petioles. The adjust- ment in many opposite-leaved trees and shrubs consists in having each pair of leaves cover the spaces between the pair below it, and sometimes in the lengthening of the lower peti- oles so as to bring the blades of the lower leaves outside those of the upper leaves. Examination of Figs. 72 and 73 will make the matter clear. The student should not fail to study the leafage of several trees of different kinds on the growing tree itself, and in climbers on walls, Fig. 70. Leaf Ai-rangement ^^^ ^ ^
. Essentials of botany. Botany; Botany. leafy twig, by a twisting about of the petioles. The adjust- ment in many opposite-leaved trees and shrubs consists in having each pair of leaves cover the spaces between the pair below it, and sometimes in the lengthening of the lower peti- oles so as to bring the blades of the lower leaves outside those of the upper leaves. Examination of Figs. 72 and 73 will make the matter clear. The student should not fail to study the leafage of several trees of different kinds on the growing tree itself, and in climbers on walls, Fig. 70. Leaf Ai-rangement ^^^ ^ ^^^-^^ j^^^ circumstances of the Oak. modify the position of the leaves. Maple leaves, for example, on the ends of the branches are arranged much like those of the horse-chestnut, but they are found to be arranged more nearly flatwise along the inner portions of the branches, that is, the portions nearer the tree. Figs. 74 and 75 show the remarkable difference in arrange- ment in different branches of the Deutzia, and equally interesting modifications may be found in alternate-leaved trees, such as the elm and the cherry. 125. Leaf-Mosaics. — In very many cases the leaves at the end of a shoot are so arranged as to form a rather symmetrical pattern, as in the horse- chestnut (Fig. 72). When this is suflQciently regular,. Fig. 71. Leaf Arrangement of European 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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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1908
