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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 · Within each leaf, the vascular tissue forms veins. The arrangement of veins in a leaf is called the venation pattern. Monocots and dicots differ in their patterns of venation. Monocots have parallel venation in which the veins run in straight lines across the length of the leaf without converging.
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.
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.
18 kwi 2013 · The design and function of leaf venation are important to plant performance, with key implications for the distribution and productivity of ecosystems, and applications in paleobiology, agriculture and technology. We synthesize classical concepts and the recent literature on a wide range of aspects of leaf venation.
Identify the parts of the angiosperm leaf. Describe some of the ways in which leaf parts differ from plant to plant. Recognize the basic patterns of leaf shape and orientation of the veins in the leaves. Leaves are shoot structures that attach to stems and branches at nodes.
Dicots have leaves with veins that connect and branch from each other. Veins in a branch-ing pattern are called netted veins. A leaf with netted veins sometimes has several smaller veins branching out of a dominant midrib, a condition known as pinnately netted. Elms and oaks have pinnate netting.
