. Botany for young people and common schools. How plants grow, a simple introduction to structural botany. With a popular flora, or an arrangement and description of common plants, both wild and cultivated. Botany. 42 HOW PLANTS of the whole. Such stems may Avell enough be called inside-groivers, because their wood increases in amount, as they grow older, by the formation of new threads or libres of wood within or amons; the old. 114. Moreover, endogenous stems are apt to make few or no brandi- es. Asparagus is the only common example to the contrary ; that branches freely. But the stal
. Botany for young people and common schools. How plants grow, a simple introduction to structural botany. With a popular flora, or an arrangement and description of common plants, both wild and cultivated. Botany. 42 HOW PLANTS of the whole. Such stems may Avell enough be called inside-groivers, because their wood increases in amount, as they grow older, by the formation of new threads or libres of wood within or amons; the old. 114. Moreover, endogenous stems are apt to make few or no brandi- es. Asparagus is the only common example to the contrary ; that branches freely. But the stalks of Corn and other grain, and those of Lilies (Fig. 1, 2) and the hke, seldom branch until they come to flower ; and Palms are trees of tliis sort, with perfectly simple or branchless trunks, rising like col- umns, and crowned with a tuft of conspicuous and peculiar foliage, which all comes from the continued growth of a terminal bud. 115. Tlic Exogenous Stem is the kind we are familiar with in ordi- nary wood. But it may be observed in tlie greater part of our herbs as well. It differs from the other class, even at the be- ginning, by the wood all occupying a certain part of the stem, and by its Avoody bundles soon appearing to run toirether into a solid layer. This layer of wood, whether much or little, is always situated around a central part, or p^V/^, which has no wood in it, being pure cellular tissue, and Is itself surrounded by a bark which is mainly or at first entirely cellular tissue. So that a slice across an exoge- nous stem always has a separate cellular part, as bark, on the circumference, then a ring of wood, and in the centre a pith; as is seen in Fig. 80, representing a piece. 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 Gray, Asa, 1810-1888. New York : Ivison, Phinney, Blakeman &
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