. Plants; a text-book of botany. Botany. 74 PLANT RELATIONS. H^. Fig. 64. An araucarian pine, showing tlie central siiaft, and the regular clusters of branches spreading in every direction and bearing numerous small leaves. The low- ermost branches extend downwards and are the largest, while those above become more horizontal and smaller. These dif- ferences in the size and direction of the branches secure the largest light expo- sure. are of this character; and as the main pur- pose is food storage the most favorable position is a subter- ranean one (see Fig. 66). Sometimes such scale leaves
. Plants; a text-book of botany. Botany. 74 PLANT RELATIONS. H^. Fig. 64. An araucarian pine, showing tlie central siiaft, and the regular clusters of branches spreading in every direction and bearing numerous small leaves. The low- ermost branches extend downwards and are the largest, while those above become more horizontal and smaller. These dif- ferences in the size and direction of the branches secure the largest light expo- sure. are of this character; and as the main pur- pose is food storage the most favorable position is a subter- ranean one (see Fig. 66). Sometimes such scale leaves become very broad and not merely overlap but en- wrap one another^ as in the case of the onion. 51. The tuber type. —The ordinary potato may be taken as an il- lustration (see Fig. (i7). The niiuule scale leaves, to be found at the "eyes" of the potato, do not overlap, which means that the stem joints are farther apart than in the bud type. The whole form of the stem results from its use as a place of food storage, and hence such stems are generally subterra- nean. Food storage, su1)terranean position, and reduced scale leaves are facts which seem to follow each other 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1900
