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Venation. 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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31 paź 2023 · The arrangement of veins in a leaf is called the venation pattern; monocots have parallel venation, while dicots have reticulate venation. The arrangement of leaves on a stem is known as phyllotaxy; leaves can be classified as either alternate, spiral, opposite, or whorled.
18 kwi 2013 · Veins are composed of xylem and phloem cells embedded in parenchyma, sometimes sclerenchyma, and surrounded by bundle sheath cells. The vein xylem transports water from the petiole throughout the lamina mesophyll, and the phloem transports sugars out of the leaf to the rest of the plant.
Leaf venation refers to the patterns the veins follow in the leaf – parallel, netted or obscure. In some cases, you will need to look at the very small veins that run between the main veins in order to identify the type of venation.
Monocots have parallel venation; the veins run in straight lines across the length of the leaf without converging at a point. In dicots, however, the veins of the leaf have a net-like appearance, forming a pattern known as reticulate venation.
28 wrz 2021 · Leaves may have vein orders above tertiary venation, including quaternary veins (fourth-order), quinternary veins (fifth-order), and even higher orders. Like tertiary veins, these veins fill in the spaces between the major veins of the leaf.
2 cze 2020 · Leaf parts and directional terms. Left: Diagram of a simple leaf showing the basic parts, including the petiole (stalk), lamina (blade), veins (strands of vascular tissue), margin (edge of the lamina), apex of the lamina, and base of the lamina. Right: Diagram of a leaf attached to a stem showing terms for directionality: adaxial (upper leaf ...
