DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Alexander flowers. Light micrograph of a section through a cluster of alexander flowers (Smyrnium olusatrum). Seen here are cross-sections of the central umbels and longitudinal sections of the outer umbels. An umbel is a cluster of flowers that consists of a number of short flower stalks (pedicels) spreading upwards and outwards from a common point, similar to an umbrella's spokes. Magnification: x14 when printed 10 centimetres tall.
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