Leaf veins. Macrophotograph of veins in the leaf of a lady's mantle, (Alchemilla vulgaris). The central vein runs diagonally from the top left to the lower centre. This contains vascular bundles that transport food (carbohydrates) and water in and out of the leaf. Smaller veins branch diagonally off the main vein and these in turn branch into finer vessels, creating an elaborate network. This branching arrangement distinguishes dicotyledonous flowering plants from the monocotyledons, which have narrow leaves and parallel veins.
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