. College botany; structure, physiology and economics of plants. Botany. 56 COLLEGE BOTANY food produots. These .functions of support and transportation are performed by the stem. The secondary functions are: (1) photosynthesis by green in the same manner as the leaves (page 195). This is of secondary importance in most plants, but is a primary function in such plants as the cactus, in which the leaves are of no con- sequence. (2) For the storage of water and reserve foods, as in the case of the cactus, the tuber of the potato and the fleshy biilbs. (3) For climbing, as in the case of t
. College botany; structure, physiology and economics of plants. Botany. 56 COLLEGE BOTANY food produots. These .functions of support and transportation are performed by the stem. The secondary functions are: (1) photosynthesis by green in the same manner as the leaves (page 195). This is of secondary importance in most plants, but is a primary function in such plants as the cactus, in which the leaves are of no con- sequence. (2) For the storage of water and reserve foods, as in the case of the cactus, the tuber of the potato and the fleshy biilbs. (3) For climbing, as in the case of the morning-glory,. Fig. 33.—Ivy holdfast type of stem. Fig. 34.—Thorn type of the grape and some of the ivies (Figs. 32 and 33). (4) As thorns (Fig. 34), in the case of the honey locust and hawtho'm. (5) For reproduction, as in the case of many underground stems, the willows, grapes and many other plants. The tendency ot many plants to reproduce by means of stems is utilized by the growers. The tubers, or underground st^ms of potatoes, are always used in the growing of this crop. Grape-s, roses, ger- aniums, begonias, carnation, privet, willows and a whole host of other plants are very generally p'ropagated by means of cuttings. Bulbs are also used for the growing of many plants. The stems are also used in grafting and bud- ding (page 103).. 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 Cook, Melville Thurston, 1869-1952. Philadelphia and London, J. B. Lippincott Company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
