. Botany of the living plant. Botany; Plants. MODIFICATIONS OF FORM 203 these successive stages out into detail, though they are found to follow certain definite methods. The point is that from a cyclic beginning a spiral disposition is arrived at. As the individual plant develops and its apex expands, the complexity of the arrangement of its appendages increases. The individual life of the Sunflower illustrates a relation that is usual, viz. that complex spiral arrangements. Fig. 136. Transverse sections through the apical buds of branches of Araucaria excelsa of different sizes. (After Churc
. Botany of the living plant. Botany; Plants. MODIFICATIONS OF FORM 203 these successive stages out into detail, though they are found to follow certain definite methods. The point is that from a cyclic beginning a spiral disposition is arrived at. As the individual plant develops and its apex expands, the complexity of the arrangement of its appendages increases. The individual life of the Sunflower illustrates a relation that is usual, viz. that complex spiral arrangements. Fig. 136. Transverse sections through the apical buds of branches of Araucaria excelsa of different sizes. (After Church.) The uppermost is of a branch of the first degree (7+11): the lower, left, a branch of the second degree (5+8): the lower, right, one of the third degree (3+5). are found where a widened axis develops with short internodes, and where the crowded primordia of leaves are of relatively small size. Such spirals occur either in the vegetative or the floral region. Very beautiful examples are seen in the vegetative shoots of Araucaria excelsa of various size (Fig. 136). A biological consequence is that with verv numerous leaves each obtains a maximum exposure to light incident from above. Moreover, since the branching is axillary in the flowering plants, the position of the branches themselves will. 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 Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
Size: 1350px × 1851px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublis, booksubjectbotany, booksubjectplants
