DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Oleander leaf. Light micrograph of a cross-section through the midrib of an oleander (Nerium oleander) leaf. The upper and lower epidermis on the surfaces of the leaf are blue. Under the upper epidermis are palisade cells (green), which contain chloroplasts, the site of photosynthesis. Within the midrib is a vascular bundle, composed of xylem (red) and phloem (dark blue) cells, which transport water and carbohydrates around the plant respectively. Magnification: x100 when printed 10 centimetres wide.
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