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Leaf veins are vascular bundles coming to the leaf from stem. The arrangement of veins in a leaf is called the venation pattern. Frequently, there is one or more main vein (primary vein) and secondary veins that branch from it. Tertiary veins branch from secondary veins (F igure \(\PageIndex{11}\)).
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The leaf blade is (usually) the flat, photosynthetic part of the blade. In eudicots, the leaf will have a central midvein (also called the midrib), with smaller veins branching off from there. This type of vein organization is called netted venation. The edge of the blade is the margin.
Parallel venation: In this type the vein and veinlets in leaf-blade are arranged parallel to one another. It is characteristic to monocotyledonous plants with few exceptions like Dioscorea and Sarsaparilla.
2 lut 2023 · The leaf veins are small channels or capillaries that transport water and minerals to and from the leaf of a plant. They are vascular tissues composed of xylem and phloem cells embedded mainly in the parenchyma and sometimes sclerenchyma cells.
Main Leaf Veins – In the middle of the lamina (leaf blade), a prominent mid-rib or main vein connects with the petiole. Secondary Leaf Veins: The veins branching from the primary vein are called secondary veins.
Main vein, generally in the center of the leaf from which secondary veins emerge.
Venation is the arrangement of veins in the leaf blade or lamina. There are two forms of venation: reticulate venation and parallel venation. Reticulate Venation: All dicot leaves have this sort of venation.
