. Class-book of botany [microform] : being outlines of the structures, physiology, and classification of plants : with a flora of the United States and Canada. Botany; Botany; Plants; Plants; Botanique; Botanique; Plantes; Botanique. THE LEAF. AFTER VII THE L EAF. 217. Its importance. The leaf constitutes the verdure of plants, and is by far the most conspicuous and beautiful object in the scenery of nature. It is also of the highest impoitance in the vegetable econ- omy, being the organ of digestion and respiration. 218. The leaf is characterized by a thin and expanded form, presenting the la
. Class-book of botany [microform] : being outlines of the structures, physiology, and classification of plants : with a flora of the United States and Canada. Botany; Botany; Plants; Plants; Botanique; Botanique; Plantes; Botanique. THE LEAF. AFTER VII THE L EAF. 217. Its importance. The leaf constitutes the verdure of plants, and is by far the most conspicuous and beautiful object in the scenery of nature. It is also of the highest impoitance in the vegetable econ- omy, being the organ of digestion and respiration. 218. The leaf is characterized by a thin and expanded form, presenting the largest possible surface to the action of the air and light, which agents are indispensable to the life and increase of the plant. 'J 19. The color op the leaf is almost universally green, which of all colors la the most agreeable to the eye; but its intensity vaiies by infinite shades, and is often finely contrasted with the more delicate tints of the flower. Towards maturity its verdure is changed, often to the most brilliant hues, as red, crimson, oran-re, yel- low, giving our autumnal forest scenery a gaiety, variety, an 3 splendor o^ coloring which the wildest fancy could scarcely surpass. m in ^ PHYLLOTAXY, OR LEAF-ARRANGEMENT 220. As the position of the leaf upon the stem marks the position o» t»ic cixillar bud, it follows that ttie order of the leaf-arrangement will be the order ol the branches also. The careful investigation of this subject has developed a science of unexpected exactness and beauty, called phyllotaxy {<l)v?,Xov, a leaf, rd^ig, order. 8ft 8f. 86, Ladlfls'-sllpper (leaves nlternnte); 86. Synnndra ptrnndlflora (leavos ); 88, Mede«la VirRlnina (loaves vertloiUate); 87, Larix Amoricana (leaves fasciculate).. 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 Wood, Alphonso, 181
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Keywords: ., bookcentury1800, bookdecade, booksubjectbotany, booksubjectplants
