. 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. KINDS AXD FORMS OF LEAVES. 45 Nor are what we call irins to be likened particularly to the blooclvessels of ani- mals. But this name is not ?o bad ; for the minute fibres which, united in bun- dles, make up the ribs and veins, are hollow tubes, and serve more or less for con- veying the sap. 125. As to the veininr/, or the arrangement of the framework in the blade, leaves are divide
. 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. KINDS AXD FORMS OF LEAVES. 45 Nor are what we call irins to be likened particularly to the blooclvessels of ani- mals. But this name is not ?o bad ; for the minute fibres which, united in bun- dles, make up the ribs and veins, are hollow tubes, and serve more or less for con- veying the sap. 125. As to the veininr/, or the arrangement of the framework in the blade, leaves are divided into two classes, viz.: 1st, the Netted-veined or Reticulated, and, 2d, the Parallel-veined or Nerved. 126. KfUcd-Velnetl or RcticillPited leaves are those in which the veins branch off from the rib or ribs, and divide again and again, and some of the veins and veinlets run into one another, so forming reticulations or meshes of network tln-oufrhout the leaf. This is shown in tlie Quince-leaf (Fig. 82) ; also in the Linden or Bass wood (Fig. 83), and the Maple (Fig. 84), where the finer meshes appear in one or two of the leaves. 127. Netted-veined leaves belong to plants which have a pair of seed-leaves to their em- bryo (-IS), and stems of the exogenous structure (115). That is, these three hinds of structure, in em- bryo, stem, and leaf, generally go together. 128. Parallel-veined or JJcrvcd leaves are those in which the ribs and veins run side by side without branching (or with minute cross-veinlets, if any) from the base to the point of the blade, as in Indian-Corn, Lily of the Valley (Fig. 85), &c., or sometimes from the midrib to the margins, as in the Banana and Calla (Fig. 86). Such parallel veins have been called Nerves, as just explained (124). Leaves of this sort belong to plants with one cotyledon to their embryo (47), and with endogenoua stems (113).. 83. Linden. Netted-veined Leaves of 84. Maple. Please note that these images are extracted from scanned page
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