. Foundations of botany. the figure above mentioned) are found in the so-calledroot-leaves of plants. Good examples of these are the dandelion, chicory, falldandelion, thistle, hawk-weed, pyrola, are the leaves ofthese plants kept fromshading each other? 151. Much-DividedLeaves. — Not infre-quently leaves are cutinto slender fringe - likedivisions, as in the carrot,tansy, southernwood,wormwood, yarrow, dog-fennel, cypress-vine, and many other common plants. Thiskind of leaf seems to be adapted to offer considerablesurface to the sun without cut-ting off too much light fromother le
. Foundations of botany. the figure above mentioned) are found in the so-calledroot-leaves of plants. Good examples of these are the dandelion, chicory, falldandelion, thistle, hawk-weed, pyrola, are the leaves ofthese plants kept fromshading each other? 151. Much-DividedLeaves. — Not infre-quently leaves are cutinto slender fringe - likedivisions, as in the carrot,tansy, southernwood,wormwood, yarrow, dog-fennel, cypress-vine, and many other common plants. Thiskind of leaf seems to be adapted to offer considerablesurface to the sun without cut-ting off too much light fromother leaves underneath. Sucha leaf is in much less danger ofbeing torn by severe winds thanare broader ones with undividedmargins. The same purposesare served by compound leaveswith very many small leaflets,such as those of the honey-locust, mimosa acacia (Fig. 113),and other trees and shrubs of the pea family. What kindof shade is produced by a horse-chestnut or a maple treecompared with that of a honey-locust or an acacia ?. Fig. 111. —Leaf-Mosaic of aCampanula. 144 FOUNDATIONS OF BOTANY
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1901
