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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.
30 sty 2024 · Leaf venation. Veins in leaves are arranged in different patterns and they are another characteristic that is very helpful in plant identification (Figure \(\PageIndex{7}\)). Pinnate leaf venation is the first to come to mind when we think about a typical leaf.
The arrangement of veins in a leaf is called the venation pattern. Monocots and dicots differ in their patterns of venation ( Figure 30.22 ). Monocots have parallel venation; the veins run in straight lines across the length of the leaf without converging at a point.
The venation differs in the two examples below. The oak leaf is pinnate, with a major vein heading down the midrib of the leaf. The maple leaf is palmate, with major veins that radiate from the point of attachment to the petiole. Oak leaves have pinnate venation (L), while maple leaves have palmate venation (R).
18 kwi 2013 · 7. Free-ending veins. Leaves vary strongly in the presence and number of free-ending veins (FEVs; Fig. 2a–d). The morphology of the cells in the FEVs is diverse, often including one to three tracheids with large lumens, and cell walls thickened in discrete hoops (Strain, 1933).
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. The outer layer of veins is made of bundle sheath cells. Leaf Veins.
