. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. 180 PRACTICAL COURSE IN BOTANY Observe both branches in their natural position; what part of the leaf is turned upward, the edge or the surface of the blade? Change the position of the two sprigs, placing the vertically growing one horizontal, and the horizontal one vertical. What part of the leaves is turned upward in each ?. 232 233 Figs. 232, 233. — Adjustment of leaves to different positions: 232, upright; 233, procumbent. 197. Leaf mosaics. — Trees with horizontal or
. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. 180 PRACTICAL COURSE IN BOTANY Observe both branches in their natural position; what part of the leaf is turned upward, the edge or the surface of the blade? Change the position of the two sprigs, placing the vertically growing one horizontal, and the horizontal one vertical. What part of the leaves is turned upward in each ?. 232 233 Figs. 232, 233. — Adjustment of leaves to different positions: 232, upright; 233, procumbent. 197. Leaf mosaics. — Trees with horizontal or drooping branches, like the elm and beech, and vines growing along walls or trailing on the ground, generally display their foliage in flat, spreading layers, each leaf fit- ting in between the interstices of the others like the stones in a mosaic, whence this has been called the mosaic arrangement. (Plate 10.) In plants of more upright or bunchy habit, the leaves are placed at all angles, giving the appearance of a rosette when viewed from above, whence this is called the rosette arrangement. A variety of the same disposition is seen in the pyramidal shape assumed by plants with large, undivided leaves like the mullein and burdock (Fig. 237), in which access of light is secured by a mutual adjustment between the size and position of leaves, the upper ones becoming successively 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 Andrews, Eliza Frances, b. 1840; Lloyd, Francis Ernest, 1868-1947. ed. New York, Cincinnati [etc. ] American book company
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