Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . d usuallyhas a considerable number of parts ready formed in miniature beforeit begins to grow, and has a full store of assimilated sap accumulatedin the parent stem to feed upon. This is no less the case in manystrong embryos highly developed in the seed, and supplied withabundant nourishment, either inthe cotyledons, as in the Pea(Fig. 119) and Oak (Fig. 120),or in the albumen, as in IndianCorn (Fig. 126-130). Thestron
Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . d usuallyhas a considerable number of parts ready formed in miniature beforeit begins to grow, and has a full store of assimilated sap accumulatedin the parent stem to feed upon. This is no less the case in manystrong embryos highly developed in the seed, and supplied withabundant nourishment, either inthe cotyledons, as in the Pea(Fig. 119) and Oak (Fig. 120),or in the albumen, as in IndianCorn (Fig. 126-130). Thestrong buds which in manyshrubs and trees crown theapex of a stem when it hascompleted its growth for theseason, often exhibit the wholeplan and amount of the nextyears growth; the nodes, andeven the leaves they bear, beingalready formed, and only re-quiring the elongation of theinternodes for their full ex-pansion. This is rudely shownin the annexed diagrams, , 152. As the bud () is well supplied withnourishment in spring by thestem on which it rests, its axis elongates rapidly; and although thegrowth commences with the lowest internode, yet the second, third,. FIG. 151. Diagram of the vertical section of a strong bud, such as that of Ilorsechestnut. FIG. 152. The axis of the same developing, the elongation beginning with the lowest inter-node, soon followed by the others in succession. FIG. 153. A years growth of Ilorsechestnut, crowned with a terminal bud : a, scars leftby the bud-scales of the previous year : b, scars left by the fallen leafstalks : c, axillary buds. FIG. 154. Branch and buds (all axillary) of the lilac. 94 THE STEM, and fourth internodes, &c. have begun to lengthen long before thefirst has attained its full growth. The stem thus continued froma terminal bud is, if it survive, again terminated with a similar bud at the close of the season, which in itsdevelopment repeats the same set of narrow rings on the bark(Fig. 153, a) commonly mark
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1860, booksubjectbotany
