. 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; Botany. 46 HOW PLANTS GROW. 129. Parallel-veined leaves, we see, are of two sorts;— 1. those with the veins or nerves all running from tlie base of the leaf to the point (Fig. 85) ; and, 2. thoss where they mostly run from the midrib to the margin, as in Fig. 86. Netted-veined leaves likewise are of two sorts, the Feather-veined and the Radiate-veined. 130. Feather-veined (al- so ca
. 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; Botany. 46 HOW PLANTS GROW. 129. Parallel-veined leaves, we see, are of two sorts;— 1. those with the veins or nerves all running from tlie base of the leaf to the point (Fig. 85) ; and, 2. thoss where they mostly run from the midrib to the margin, as in Fig. 86. Netted-veined leaves likewise are of two sorts, the Feather-veined and the Radiate-veined. 130. Feather-veined (al- so called pinnately veined) leaves are those in which the main veins all spring from the two sides of one rib, viz. the midrib, like the plume of a feather from each side of the shaft. Fig- ures 82, 88-97, 120, 122, &c. represent feather-veined leaves. 131. Radiate-Veined (al- so called palmately veined) leaves are those which have three or more main ribs ris- ing at once from the place where the footstalk joins the blade, and commonly diverg- ing, like rays from a centre ; the veins branching off from these. Of this sort are the leaves of the Maple (Fig. 84), Mallow, Currant, Grape-Vine, and less dis- tinctly of the Linden (Fig. 83). Such leaves are generally roundish in shape. It is evident that this kind of veining is adapted to round leaves, and the other kind for those longer than wide. 132. Shapes of Leaves. As to general shape, the following are the names of the principal sorts. (It will be a good exercise for students to look up examples which fit the definitions.) Linear ; narrow, several times longer than wide, and of about the same width throughout, as in Fig. 87. Lance-shaped or Lanceolate ; narrow, much longer than wide, and tapering up- wards, or both upwards and downwards, as in F"'ig. 88. Oblong ; two or three times longer than broad, as in Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectbotany, bookyear1858
