Witch-hazel leaf surface, SEM

Witch-hazel leaf surface, SEM

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This image is part of the feature Medicine From Plants

Credit: EYE OF SCIENCE/SCIENCE PHOTO LIBRARY

Caption: Witch-hazel leaf surface. Coloured scanning electron micrograph (SEM) of the upper surface of a witch-hazel (Hamamelis virginiana) leaf. Veins (vascular bundles) branch across the surface (grey). These contain xylem and phloem, which conduct water and nutrients throughout the leaf. The star- shaped structure is a hair cell or trichome. The blade of the leaf is formed of a layer of epidermal cells (green), among which are stomata (leaf pores, white). These are the sites of gaseous exchange. Witch-hazel is used in herbal medicine to treat sprains, burns and skin inflammation. Magnification: x80 when printed 10 centimetres wide.

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Keywords: alternative, botany, branching, bundles, coloured, complementary, epidermal cells, epidermis, gaseous exchange, hair cell, hamamelis virginiana, herbal medicine, horizontal, leaf, leaves, medicinal herb, nature, plant, plants, pore, pores, scanning electron micrograph, sem, shrub, stoma, stomata, structure, surface, tree, trichome, vascular bundle, vein, veins, venation, witch hazel, witch-hazel

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