DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Castor oil stem. Light micrograph of a longitudinal section through the stem of a castor oil (Ricinus communis) plant. At right are large and small parenchyma cells (blue). Immediately to their left are two rows of proto-xylem vessels and one row of spiral meta-xylem (both red), which transport water around the plant. To the left of this is a bundle of phloem fibres (red) sandwiched between two groups of phloem cells (blue). Magnification: x45 when printed at 10 centimetres tall.
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