STEVE LOWRY / SCIENCE PHOTO LIBRARY STEVE LOWRY / SCIENCE PHOTO LIBRARY
Coloured light micrograph of a stained cross section of a young bud of German iris (Iris germanica) showing three central petals, known as standards. The outer structures, which resemble petals, are sepals referred to as falls. These falls have a central beard (yellow) which acts as a landing marker for insects. The anthers (brown) are directly above the beard. The female parts of the flower, known as the style arms, are located above the sepals. Magnification: x22 at 10cm wide.
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