Cette illustration montre la veine grillagée (palmate) d'une feuille de melon, qui est une caractéristique clé de la morphologie végétale. Il décrit la disposition des veines dans une structure foliaire typique, aidant les élèves à comprendre la botanique de base et les modèles de venation foliaire. Ces types de diagrammes sont utilisés à des fins éducatives pour initier les élèves à l'anatomie des plantes et à la structure foliaire.
1280 x 1951 px | 21,7 x 33 cm | 8,5 x 13 inches | 150dpi
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. Essentials of botany. Botany; Botany. Fig. 60. Netted Veining (pal- mate) in Leaf of Melon. identifying them. The student is not expected to learn the names of the several shapes of leaves as a w^hole or of their bases, tips, or margins, except in those cases in which he needs to use and apply them. Many of the words used to describe the shapes of leaves are equally applicable to the leaf- like parts of flowers. 116. The Maple Leaf. — Sketch the leafy twig. Are the leaves arranged in rows like those of the elm ? How are they arranged ? How are the petioles distorted from their natural positions to bring the proper surface of the leaf upward toward the light? Do the edges of these leaves show larger spaces between them than the elm leaves did, i.e., would a spray of maple intercept the sunlight more or less perfectly than a spray of elm V Pull off a single leaf and sketch its lower surface, about natural size. Of the two main parts whose names have already been learned (blade and petiole), which is more developed in the maple than in the elm leaf? Describe: (a) The shape of the maple leaf as a whole. To settle this, place the leaf on paper, mark the positions of the extreme points, and connect these by a smooth line. (h) Its outline as to main divisions; of what kind and how many ? (c) The detailed outline of the mar- gin. (See Appendix I.). Fig. 61. Pinnately Divided Leaf of Celandine. The blade of the leaf is discon- tinuous, consisting of several portions, between which are •spaces in which one part of the blade has been developed.. 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 work.. Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn
