The elements of botany for The elements of botany for beginners and for schools elementsofbotany00gray Year: 1887 138 VEGETABLE LIFE AND WORK. [SECTION 16. needle-shaped (rhapliides), as in stalks of Calla-Lily, Rhubarb, or Four- o'clock, they are usually packed in sheaf-like bundles. (Fig. 465, 466.) § 3. ANATOMY OF ROOTS AND STEMS. 423. This is so nearly the same that an account of the internal structure of stems may serve for the root also. 424. At the beginning, either in the embryo or in an incipient shoot from a bud, the whole stem is of tender cellular tissue or parenchyma. But wood (c
The elements of botany for The elements of botany for beginners and for schools elementsofbotany00gray Year: 1887 138 VEGETABLE LIFE AND WORK. [SECTION 16. needle-shaped (rhapliides), as in stalks of Calla-Lily, Rhubarb, or Four- o'clock, they are usually packed in sheaf-like bundles. (Fig. 465, 466.) § 3. ANATOMY OF ROOTS AND STEMS. 423. This is so nearly the same that an account of the internal structure of stems may serve for the root also. 424. At the beginning, either in the embryo or in an incipient shoot from a bud, the whole stem is of tender cellular tissue or parenchyma. But wood (consisting of wood-cells and ducts or vessels) begins to be formed in the earliest growth ; and is from the first arranged in two ways, making two general kinds of wood. The difference is obvious even in herbs, but is more conspicuous in the enduring stems of shrubs and trees. 425. On one or the other of these two types the stems of all phanero- gamous plants are constructed. In one, the wood is made up of separate threads, scattered here and there throughout the whole diameter of the stem. In the other, the wood is all collected to form a layer (in a slice across the stem appearing as a ring) between a central cellular part which has none in it, the Pith, and an outer cellular part, the Bark. 426. An Asparagus-shoot and a Corn-stalk for herbs, and a rattan for a woody kind, represent the first kind. To it belong all plants with monocotyledonous em- bryo (40). A Bean-stalk and the stem of any com- mon shrub or tree rep- resent the second ; and
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