What is
Secondary vein and primary vein
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More frequently called midrib or stem of the leaf, especially when it is prominently raised or depressed, the midvein is the main or central vein of a leaf from which arise the secondary or lateral veins. It is usually continuous with the petiole and is often raised above the lamina (the leaf blade).
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The midvein or primary vein is the main or central vein of a leaf from which arise the secondary or lateral veins. More frequently called midrib or stem of the leaf, especially when it is prominently raised or depressed, the midvein is the main or central vein of a leaf from which arise the secondary or lateral veins.
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