vein

leaf structure

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  In leaf: Leaf morphology

  …type of venation (arrangement of veins). When only a single blade is inserted directly on the petiole, the leaf is called simple. The margins of simple leaves may be entire and smooth or they may be lobed in various ways. The coarse teeth of dentate margins project at right angles,…

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  In angiosperm: Leaves

  The smaller lateral veins of the leaf are initiated near the leaf tip; subsequent major lateral veins are initiated sequentially toward the base, following the overall pattern of leaf development. A major lateral vein may have one or more orders of smaller veins, which also are initiated in…

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  In plant: Leaves and roots

  …possess a network of interconnecting veins and minor veins between the larger veins of the leaf (a pattern called net venation). Leaves of monocots possess major veins that extend parallel to the long axis of the leaf (parallel venation). Leaves are classified on the basis of leaf arrangement and whether…

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