GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Horse chestnut leaf. The horse chestnut tree (Aesculus hippocastanum) is a deciduous tree (its leaves are lost in autumn). The leaf contains the green pigment chlorophyll that is used to trap the energy of sunlight during photosynthesis. A network of veins carries water and nutrients in and out of the leaf.
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