. Botany of the living plant. Botany; Plants. BOTANY OP THE LIVING PLANT tbility is common. It is styled meristic variation, and probably on in producing it is the size of the apical cone, which, when large proportionally to the leaf-primordia, can accommodate a larger Dumber of young leaves at the same level. Such variations are .union in the floral region, where cyclic arrangements prevail. [Compare Floral Diagrams in Appendix A.) But in most Dicotyledons, and very generally in Monocotyledons, the arrangement of the leaves is alternate] that is, they are seated singly, each at a different le
. Botany of the living plant. Botany; Plants. BOTANY OP THE LIVING PLANT tbility is common. It is styled meristic variation, and probably on in producing it is the size of the apical cone, which, when large proportionally to the leaf-primordia, can accommodate a larger Dumber of young leaves at the same level. Such variations are .union in the floral region, where cyclic arrangements prevail. [Compare Floral Diagrams in Appendix A.) But in most Dicotyledons, and very generally in Monocotyledons, the arrangement of the leaves is alternate] that is, they are seated singly, each at a different level upon the axis. The arrangement is. Fig. 135. A F. Ground-plans of buds of Sunflower of different ages : but these drawings are not uniform in scale. See Text. (After Church.) often such that an ascending spiral line may be drawn round the mature stem so as to thread together the bases of them all. Such arrangements are therefore described as spiral. That the cyclic and spiral modes of arrangement are not essentially distinct from one another is shown by the fact that both may appear successively in the same plant. For instance, in the Sunflower, the seedling starts with paired cotyledons, followed by decussate leaves of the plumule (Fig. 135, a), which arrangement may be maintained for a time (c) ; but sooner or later irregularities appear (b), leading to an alternate arrangement (dj, which becomes more complex in the upper vegetative on (e), and culminates in the very complex structure of the flowering head (Fig. 135, f). It will be unnecessarv for us to trace. 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.
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