DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Broad bean flower. Polarised light micrograph of a section through a flower from a broad bean (Vicia faba) plant, showing the stamens and stigma. The central style (black and orange) tapers to a tip (red and white) to produce the sponge-shaped stigma with hairs on the underside which trap pollen grains (red) from its own pollen to stop self-pollination. The stamens are fused below into a tube, but the tubular filaments (blue and orange with red spots) are free at their ends and lead to the anthers (dark, orange-spotted). The anthers have pollen sacs, which have split to release their pollen grains. Magnification: x5 when printed 10 centimetres wide.
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