. Foundations of botany. should not fail tostudy the leafageof several trees ofdifferent kinds onthe growing treeitself, and inclimbers on walls(Plate III), and tonotice how circum-stances modify the position of the leaves. Maple leaves, forexample, on the ends of the branches are arranged much Fig. 108.—Leaf Arrangement of Horse-Chestnuton Vertical Shgots (side view). 142 FOUNDATIONS OF BOTANY like those of the horse-chestnut, but they are found to bearranged more nearly flatwise along the inner portionsof the branches, that is, the portions nearer the 109 and 110 show the remarkab
. Foundations of botany. should not fail tostudy the leafageof several trees ofdifferent kinds onthe growing treeitself, and inclimbers on walls(Plate III), and tonotice how circum-stances modify the position of the leaves. Maple leaves, forexample, on the ends of the branches are arranged much Fig. 108.—Leaf Arrangement of Horse-Chestnuton Vertical Shgots (side view). 142 FOUNDATIONS OF BOTANY like those of the horse-chestnut, but they are found to bearranged more nearly flatwise along the inner portionsof the branches, that is, the portions nearer the 109 and 110 show the remarkable difference inarrangement in different branches of the ^Quizi^ andequally interesting modifications may be found inalternate-leaved trees, such as the elm and the Fig. 109. —Opposite Leaves of Deutzia^ (from the same shrub as Fig. 110), asarranged on a Horizontal Branch. ? 150. Leaf-Mosaics. — In very many cases the leaves atthe end of a shoot are so arranged as to form a prettysymmetrical pattern, as in the horse-chestnut (Fig. 107).When this is sufficiently regular, usually with the spacebetween the leaves a good deal smaller than the areas ofthe leaves themselves, it is called a leaf-mosaic (Fig. 111).Many of the most interesting leaf-groups of this sort (as 1 Deutzia crenata. LEAF EXPOSURE TO SUN AIST) AIR 143
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